U.S. patent application number 15/979585 was filed with the patent office on 2018-11-22 for structure and method for improving adhesion strength of coating.
The applicant listed for this patent is Yuelan DI, Lihong DONG, Guozheng MA, Haidou WANG, Zhiguo XING. Invention is credited to Yuelan DI, Lihong DONG, Guozheng MA, Haidou WANG, Zhiguo XING.
Application Number | 20180334738 15/979585 |
Document ID | / |
Family ID | 64270424 |
Filed Date | 2018-11-22 |
United States Patent
Application |
20180334738 |
Kind Code |
A1 |
WANG; Haidou ; et
al. |
November 22, 2018 |
STRUCTURE AND METHOD FOR IMPROVING ADHESION STRENGTH OF COATING
Abstract
A method and a structure for improving adhesion strength of a
coating are provided. The method includes: step 1), preparing
textured patterns, where at least one type of pattern is textured
on a surface of a substrate using a laser process based on bionics;
step 2), regulating a parameter, where a spraying process parameter
is regulated based on a parameter of the textured patterns; and
step 3), spraying a coating, where spraying is performed on the
substrate obtained in step 1) using a supersonic plasma spraying
method.
Inventors: |
WANG; Haidou; (Beijing,
CN) ; XING; Zhiguo; (Beijing, CN) ; MA;
Guozheng; (Beijing, CN) ; DONG; Lihong;
(Beijing, CN) ; DI; Yuelan; (Beijing, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
WANG; Haidou
XING; Zhiguo
MA; Guozheng
DONG; Lihong
DI; Yuelan |
Beijing
Beijing
Beijing
Beijing
Beijing |
|
CN
CN
CN
CN
CN |
|
|
Family ID: |
64270424 |
Appl. No.: |
15/979585 |
Filed: |
May 15, 2018 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
C23C 4/02 20130101; C23C
4/10 20130101; C23C 4/134 20160101 |
International
Class: |
C23C 4/02 20060101
C23C004/02; C23C 4/10 20060101 C23C004/10; C23C 4/134 20060101
C23C004/134 |
Foreign Application Data
Date |
Code |
Application Number |
May 16, 2017 |
CN |
201710344773.5 |
May 16, 2017 |
CN |
201710344775.4 |
May 16, 2017 |
CN |
201710344801.3 |
May 16, 2017 |
CN |
201710344817.4 |
May 16, 2017 |
CN |
201710344821.0 |
May 16, 2017 |
CN |
201710344824.4 |
May 16, 2017 |
CN |
201710345254.0 |
May 16, 2017 |
CN |
201710345260.6 |
May 16, 2017 |
CN |
201710345262.5 |
May 16, 2017 |
CN |
201710345263.X |
May 16, 2017 |
CN |
201710345265.9 |
May 16, 2017 |
CN |
201710345266.3 |
May 16, 2017 |
CN |
201710347052.X |
May 16, 2017 |
CN |
201710347053.4 |
Claims
1. A method for improving adhesion strength of a coating,
comprising: step 1), preparing textured patterns, wherein at least
one type of patterns are textured on a surface of a substrate using
a laser process based on bionics; step 2), regulating a parameter,
wherein a spraying process parameter is regulated based on a
parameter of the textured patterns formed in step 1); and step 3),
spraying a coating, wherein spraying is performed on the substrate
obtained in step 1) using a supersonic plasma spraying method.
2. The method for improving the adhesion strength of the coating
according to claim 1, wherein the parameter of the textured
patterns comprises one or more of a pattern shape, a pattern
distance, a pattern dimension and pattern arrangement.
3. The method for improving the adhesion strength of the coating
according to claim 2, wherein the pattern shape comprises one of a
channel shape, a square, a regular hexagon and a circle, or a
combination thereof.
4. The method for improving the adhesion strength of the coating
according to claim 2, wherein the pattern dimension comprises one
of a depth, a side length, a width and a diameter, or a combination
thereof.
5. The method for improving the adhesion strength of the coating
according to claim 3, wherein the pattern shape comprises the
channel shape and the circle, the channel shape and the circle are
combined alternately, and the step 1) comprises: texturing at least
three columns of circular patterns, wherein a preset distance is
reserved between each pair of adjacent columns of circular
patterns, the preset distance is greater than a width of a
channel-shaped pattern to be textured, and texturing a column of
channel-shaped patterns between each pair of adjacent columns of
circular patterns.
6. The method for improving the adhesion strength of the coating
according to claim 3, wherein the pattern shape comprises the
regular hexagon and the square, the regular hexagon and the square
are combined alternately, and the step 1) comprises: texturing at
least three columns of square patterns, wherein a preset distance
is reserved between each pair of adjacent columns of square
patterns, the preset distance is greater than a length of the
longest diagonal line of a regular-hexagonal pattern to be
textured; and texturing a column of regular-hexagonal patterns
between each pair of adjacent columns of square patterns.
7. The method for improving the adhesion strength of the coating
according to claim 3, wherein the pattern shape comprises the
regular hexagon and the circle, the regular hexagon and the circle
are combined alternately, and the step 1) comprises: texturing at
least three columns of circular patterns, wherein a preset distance
is reserved between each pair of adjacent columns of circular
patterns, the preset distance is greater than a length of the
longest diagonal line of a regular-hexagonal pattern to be
textured; and texturing a column of regular-hexagonal patterns
between each pair of adjacent columns of circular patterns.
8. The method for improving the adhesion strength of the coating
according to claim 3, wherein the pattern shape comprises the
square and the circle, the square and the circle are combined
alternately, and the step 1) comprises: texturing at least three
columns of circular patterns, wherein a preset distance is reserved
between each pair of adjacent columns of circular patterns, the
preset distance is greater than a side length of a square pattern
to be textured; and texturing a column of square patterns between
each pair of adjacent columns of circular patterns.
9. The method for improving the adhesion strength of the coating
according to claim 3, wherein the pattern shape comprises the
square and the channel shape, and the square and the channel shape
are combined alternately, and the step 1) comprises: texturing at
least three columns of channel-shaped patterns, wherein a preset
distance is reserved between each pair of adjacent columns of
channel-shaped patterns, the preset distance is greater than a side
length of a square pattern to be textured; and texturing a column
of square patterns between each pair of adjacent columns of
channel-shaped patterns.
10. The method for improving the adhesion strength of the coating
according to claim 3, wherein the pattern shape comprises the
regular hexagon and the channel shape, the regular hexagon and the
channel shape are combined alternately, and the step 1) comprises:
texturing at least three columns of channel-shaped patterns,
wherein a preset distance is reserved between each pair of adjacent
columns of channel-shaped patterns, the preset distance is greater
than a length of the longest diagonal line of a regular-hexagonal
pattern to be textured; and texturing a column of regular-hexagonal
patterns between each pair of adjacent columns of channel-shaped
patterns.
11. The method for improving the adhesion strength of the coating
according to claim 1, before step 1), further comprising a
substrate preprocessing step of polishing and cleaning the surface
of the substrate.
12. The method for improving the adhesion strength of the coating
according to claim 1, wherein in step 1), the substrate is made of
stainless steel.
13. The method for improving the adhesion strength of the coating
according to claim 1, wherein the coating in step 3) is a NiCrBSi
ceramic coating, the sprayed coating obtained by the supersonic
plasma spraying method has a thickness of approximately 500 .mu.m,
and a particle size of used NiCrBSi powder ranges from 50 .mu.m to
60 .mu.m.
14. The method for improving the adhesion strength of the coating
according to claim 4, wherein the textured patterns prepared in
step 1) have a depth ranging from 30 .mu.m to 120 .mu.m, and a
diameter ranging from 35 .mu.m to 65 .mu.m.
15. A structure for improving adhesion strength of a coating,
comprising: a substrate; textured patterns having at least one type
of pattern prepared on the substrate; and a coating sprayed on the
textured patterns.
16. The structure according to claim 15, wherein the textured
pattern is in a shape of one of a square, a channel shape, a circle
and a regular hexagon, or a combination thereof.
17. The structure according to claim 15, wherein the substrate is
made of stainless steel, and the coating is a NiCrBSi ceramic
coating.
Description
[0001] This application claims priority to Chinese Patent
Application No. 201710345260.6, titled "STRUCTURE AND METHOD FOR
IMPROVING ADHESION STRENGTH OF COATING", and filed with the Chinese
State Intellectual Property Office on May 16, 2017.
[0002] This application claims priority to Chinese Patent
Application No. 201710344801.3, titled "STRUCTURE AND METHOD FOR
IMPROVING ADHESION STRENGTH OF COATING BY REGULATING DEPTH OF
TEXTURED PATTERNS", and filed with the Chinese State Intellectual
Property Office on May 16, 2017.
[0003] This application claims priority to Chinese Patent
Application No. 201710345254.0, titled "STRUCTURE AND METHOD FOR
IMPROVING ADHESION STRENGTH OF COATING BY REGULATING TEXTURING
DISTANCE", and filed with the Chinese State Intellectual Property
Office on May 16, 2017.
[0004] This application claims priority to Chinese Patent
Application No. 201710344775.4, titled "STRUCTURE AND METHOD FOR
IMPROVING ADHESION STRENGTH OF PLASMA-SPRAYED COATING BY CHANGING
DIAMETER OF TEXTURED RECESS", and filed with the Chinese State
Intellectual Property Office on May 16, 2017.
[0005] This application claims priority to Chinese Patent
Application No. 201710345262.5, titled "STRUCTURE AND METHOD FOR
IMPROVING ADHESION STRENGTH OF NICKEL-BASED COATING USING COMPOSITE
TEXTURED PATTERNS", and filed with the Chinese State Intellectual
Property Office on May 16, 2017.
[0006] This application claims priority to Chinese Patent
Application No. 201710347052.X, titled "STRUCTURE AND METHOD FOR
IMPROVING ADHESION STRENGTH OF COATING BASED ON TEXTURED PATTERNS
FORMED BY ALTERNATELY COMBINING SYMMETRICAL PATTERNS", and filed
with the Chinese State Intellectual Property Office on May 16,
2017.
[0007] This application claims priority to Chinese Patent
Application No. 201710345265.9, titled "STRUCTURE AND METHOD FOR
IMPROVING ADHESION STRENGTH OF COATING BY CHANGING SIDE LENGTH OF
SQUARE TEXTURED PATTERNS", and filed with the Chinese State
Intellectual Property Office on May 16, 2017.
[0008] This application claims priority to Chinese Patent
Application No. 201710345263.X, titled "STRUCTURE AND METHOD FOR
IMPROVING ADHESION STRENGTH OF COATING BASED ON TEXTURED PATTERNS
FORMED BY ALTERNATELY COMBINING BIONIC ANIMAL SURFACE PATTERNS AND
CIRCLES", and filed with the Chinese State Intellectual Property
Office on May 16, 2017.
[0009] This application claims priority to Chinese Patent
Application No. 201710345266.3, titled "STRUCTURE AND METHOD FOR
IMPROVING ADHESION STRENGTH OF COATING BASED ON SIDE LENGTH OF
HEXAGONAL TEXTURED PATTERN ON SURFACE OF TURTLE SHELL", and filed
with the Chinese State Intellectual Property Office on May 16,
2017.
[0010] This application claims priority to Chinese Patent
Application No. 201710344773.5, titled "STRUCTURE AND METHOD FOR
IMPROVING ADHESION STRENGTH OF COATING BASED ON TEXTURED PATTERNS
FORMED BY ALTERNATE COMBINATION", and filed with the Chinese State
Intellectual Property Office on May 16, 2017.
[0011] This application claims priority to Chinese Patent
Application No. 201710347053.4, titled "STRUCTURE AND METHOD FOR
IMPROVING ADHESION STRENGTH OF COATING BASED ON TEXTURED PATTERNS
FORMED BY ALTERNATELY COMBINING SQUARES AND CHANNEL SHAPES", and
filed with the Chinese State Intellectual Property Office on May
16, 2017.
[0012] This application claims priority to Chinese Patent
Application No. 201710344817.4 titled "STRUCTURE AND METHOD FOR
IMPROVING ADHESION STRENGTH OF SUPERSONIC PLASMA-SPRAYED COATING BY
CHANGING TEXTURING PARAMETER OF CHANNEL SHAPE", and filed with the
Chinese State Intellectual Property Office on May 16, 2017.
[0013] This application claims priority to Chinese Patent
Application No. 201710344821.0, titled "STRUCTURE AND METHOD FOR
IMPROVING ADHESION STRENGTH OF WEAR-RESISTANT ANTI-FATIGUE COATING
BASED ON COMBINATION-SHAPED TEXTURED PATTERNS", and filed with the
Chinese State Intellectual Property Office on May 16, 2017.
[0014] This application claims priority to Chinese Patent
Application No. 201710344824.4, titled "STRUCTURE AND METHOD FOR
IMPROVING ADHESION STRENGTH OF WEAR-RESISTANT ANTI-FATIGUE COATING
BY CHANGING TEXTURING PARAMETER OF CHANNEL SHAPE", and filed with
the Chinese State Intellectual Property Office on May 16, 2017.
[0015] The above Chinese Patent Applications are incorporated
herein by reference in their entireties.
FIELD
[0016] The present disclosure relates to the technical filed of
coating material, and particularly to a structure and a method for
improving adhesion strength of a coating.
BACKGROUND
[0017] A plasma-sprayed coating can be used in processing of
large-size parts, and can have a large thickness, and thus the
plasma-sprayed coating is widely applied in the engineering field.
However, the plasma-sprayed coating is bonded with a substrate
mechanically, which results in a low bonding force of the sprayed
coating. Adhesion strength between the substrate and the coating is
a critical factor affecting service performance of a
thermal-sprayed coating. In a case that the sprayed coating has low
adhesion strength, a failure may occur at an interface of the
coating in service. Therefore, multiple means such as peening and
chemical degreasing are used before the spraying. During the
chemical degreasing process, a chemical reaction occurs on a
surface, and a new oxide is produced, which results in a change in
a chemical composition on the surface of the substrate. Also, the
used chemicals are harmful to humans and the environment. The
surface of the substrate is roughened to some extent during the
peening process, but obtained patterns are irregular and are not
easily controlled. Also, a sandblasting process may result in
deformation of the substrate, and may even result in micro-cracks
on the surface of the substrate. It can be seen that the
conventional roughening processing before spraying cannot
effectively improve the bonding force of the coating.
[0018] Therefore, an urgent problem to be solved by those skilled
in the art is how to process before spraying to improve a bonding
force between the coating and the substrate, so that the sprayed
coating can be applied into the engineering practices with a long
service life.
SUMMARY
[0019] In view of this, a method for improving adhesion strength of
a coating is provided in the present disclosure, which, as a
processing before spraying, can improve a bonding force between the
coating and a substrate, so that the sprayed coating can be applied
into the engineering practices with a long service life.
[0020] A structure for improving adhesion strength of a coating is
further provided in the present disclosure.
[0021] In order to realize the above objectives, the following
technical solutions are provided in the present disclosure.
[0022] The method for improving adhesion strength of the coating
includes: step 1), preparing textured patterns, where at least one
type of pattern is textured on a surface of a substrate using a
laser process based on bionics; step 2), regulating a parameter,
where a spraying process parameter is regulated based on a
parameter of the textured patterns formed in step 1); and step 3),
spraying a coating, where spraying is performed on the substrate
obtained in step 1) using a supersonic plasma spraying method.
[0023] According to an embodiment, in the method for improving
adhesion strength of the coating described above, the parameter of
the textured patterns includes one or more of a pattern shape, a
pattern distance, a pattern dimension and pattern arrangement.
[0024] According to an embodiment, in the method for improving
adhesion strength of the coating described above, the pattern shape
includes one of a channel shape, a square, a regular hexagon and a
circle, or a combination thereof.
[0025] According to an embodiment, in the method for improving
adhesion strength of the coating described above, the pattern
dimension includes one of a depth, a side length, a width and a
diameter, or a combination thereof.
[0026] According to an embodiment, in the method for improving
adhesion strength of the coating described above, the pattern shape
includes the channel shape and the circle, and the channel shape
and the circle are combined alternately. At least three columns of
circular patterns are textured. A preset distance is reserved
between each pair of adjacent columns of circular patterns, and the
preset distance is greater than a width of a channel-shaped pattern
to be textured. A column of channel-shaped patterns are textured
between each pair of adjacent columns of circular patterns
[0027] According to an embodiment, in the method for improving
adhesion strength of the coating described above, the pattern shape
includes the square and the circle, and the square and the circle
are combined alternately. At least three columns of circular
patterns are textured. A preset distance is reserved between each
pair of adjacent columns of circular patterns, and the preset
distance is greater than a side length of a square pattern to be
textured. A column of square patterns are textured between each
pair of adjacent columns of circular patterns.
[0028] According to an embodiment, in the method for improving
adhesion strength of the coating described above, the pattern shape
includes the regular hexagon and the circle, and the regular
hexagon and the circle are combined alternately. At least three
columns of circular patterns are textured. A preset distance is
reserved between each pair of adjacent columns of circular
patterns, and the preset distance is greater than a length of the
longest diagonal line of a regular-hexagonal pattern to be
textured. A column of regular-hexagonal patterns are textured
between each pair of adjacent columns of circular patterns.
[0029] According to an embodiment, in the method for improving
adhesion strength of the coating described above, the pattern shape
includes a square and a circle, and the square and the circle are
arranged alternately. At least three columns of circular patterns
are textured. A preset distance is reserved between each pair of
adjacent columns of circular patterns, and the preset distance is
greater than a side length of a square pattern to be textured. A
column of square patterns are textured between each pair of
adjacent columns of circular patterns.
[0030] According to an embodiment, in the method for improving
adhesion strength of the coating described above, the pattern shape
includes the square and the channel shape, and the square and the
channel shape are combined alternately. At least three columns of
channel-shaped patterns are textured. A preset distance is reserved
between each pair of adjacent columns of channel-shaped patterns,
and the preset distance is greater than a side length of a square
pattern to be textured. A column of square patterns is textured
between each pair of adjacent columns of channel-shaped
patterns.
[0031] According to an embodiment, in the method for improving
adhesion strength of the coating described above, the pattern shape
includes the regular hexagon and the channel shape, and the regular
hexagon and the channel shape are combined alternately. At least
three columns of channel-shaped patterns are textured. A preset
distance is reserved between each pair of adjacent columns of
channel-shaped patterns, and the preset distance is greater than a
length of the longest diagonal line of a regular-hexagonal pattern
to be textured. A column of regular-hexagonal patterns is textured
between each pair of adjacent columns of channel-shaped
patterns.
[0032] According to an embodiment, before step 1), the method for
improving adhesion strength of the coating described above further
includes a substrate preprocessing step of polishing and cleaning
the surface of the substrate.
[0033] According to an embodiment, in the method for improving
adhesion strength of coating described above, in step 1), the
substrate is made of stainless steel.
[0034] According to an embodiment, in the method for improving
adhesion strength of coating described above, the coating in step
3) is a NiCrBSi ceramic coating. A sprayed coating obtained by the
supersonic plasma spraying method has a thickness of approximately
500 .mu.m. A particle size of NiCrBSi powder ranges from 50 .mu.m
to 60 .mu.m.
[0035] According to an embodiment, in the method for improving
adhesion strength of coating described above, the textured patterns
prepared in step 1) have a depth ranging from 30 .mu.m to 120
.mu.m, and a diameter ranging from 35 .mu.m to 65 .mu.m.
[0036] A structure for improving adhesion strength of a coating is
further provided in the present disclosure, which includes a
substrate, textured patterns having at least one type of pattern
prepared on the substrate, and a coating sprayed on the textured
patterns.
[0037] According to an embodiment, in the above structure, the
textured patterns are in a shape of one of a square, a channel
shape, a circle and a regular hexagon, or a combination
thereof.
[0038] According to an embodiment, in the above structure, the
substrate is made of stainless steel, and the coating is a NiCrBSi
ceramic coating.
[0039] As compared with the conventional technology, the present
disclosure has the following advantageous effects.
[0040] In the method provided in the present disclosure, a laser
texturing method is used for controlling a parameter of a laser
process, to obtain textured geometrical patterns with dimensions
arranged regularly at a density on the surface of the substrate.
The method, as a processing before spraying, can improve a bonding
force between the coating and the substrate, so that the sprayed
coating can be applied into the engineering practices with a long
service life. Also, a spraying process parameter is regulated based
on the parameter of the textured pattern, the adhesion strength of
the sprayed coating changes with the parameter of the textured
patterns and the spraying process parameter, thereby optimizing the
parameter of the textured patterns.
BRIEF DESCRIPTION OF THE DRAWINGS
[0041] In order to more clearly illustrate the technical solution
in the embodiments of the present disclosure or in the conventional
technology, in the following, drawings required in the description
of the embodiments or the conventional technology will be
introduced simply. Apparently, the drawings in the following
description show only some embodiments of the present disclosure.
For those skilled in the art, other drawings can also be obtained
according to the provided drawings without any creative work.
[0042] FIG. 1-1 is a schematic diagram showing form of the
channel-shaped textured patterns according to a first embodiment of
the present disclosure;
[0043] FIG. 1-2 is a schematic diagram showing adhesion strength of
channel-shaped textured patterns according to the first embodiment
of the present disclosure;
[0044] FIG. 2-1 is a schematic diagram showing form of square
textured patterns according to a second embodiment of the present
disclosure;
[0045] FIG. 2-2 is a schematic diagram showing adhesion strength of
the square textured patterns according to the second embodiment of
the present disclosure;
[0046] FIG. 3-1 is a schematic diagram showing form of hexagonal
textured patterns according to a third embodiment of the present
disclosure;
[0047] FIG. 3-2 is a schematic diagram showing adhesion strength of
the hexagonal textured patterns according to the third embodiment
of the present disclosure;
[0048] FIG. 4 shows testing results of an influence of a density of
textured patterns on adhesion strength;
[0049] FIG. 5-1 to FIG. 5-3 show form of textured patterns with a
depth of 35 .mu.m and different diameters according to a fourth
embodiment of the present disclosure;
[0050] FIG. 6-1 to FIG. 6-3 show form of textured patterns with a
depth of 60 .mu.m and different diameters according to a sixth
embodiment of the present disclosure;
[0051] FIG. 7-1 to FIG. 7-3 show form of textured patterns with a
depth of 75 .mu.m and different diameters according to an eighth
embodiment of the present disclosure;
[0052] FIG. 8 is a curve diagram showing comparison of adhesion
strength of a sprayed coating for different textured patterns;
[0053] FIG. 9 is a curve diagram of changes of contact area and the
adhesion strength of the sprayed coating with an increase in a
depth of the textured patterns;
[0054] FIG. 10-1 shows formation of a sprayed coating on textured
patterns with a distance of 30 .mu.m according to a ninth
embodiment of the present disclosure or textured patterns with a
diameter of 40 .mu.m according to a tenth embodiment of the present
disclosure;
[0055] FIG. 10-2 shows deposition of sprayed particles on the
textured pattern in FIG. 10-1;
[0056] FIG. 11-1 shows formation of a sprayed coating on textured
patterns with a distance of 50 .mu.m according to the ninth
embodiment of the present disclosure or textured patterns with a
diameter of 60 .mu.m according to the tenth embodiment of the
present disclosure;
[0057] FIG. 11-2 shows deposition of sprayed particles on the
textured pattern in FIG. 11-1;
[0058] FIG. 12-1 shows formation of a sprayed coating on textured
patterns with a distance of 70 .mu.m according to the ninth
embodiment of the present disclosure or textured patterns with a
diameter of 80 .mu.m according to the tenth embodiment of the
present disclosure;
[0059] FIG. 12-2 shows deposition of sprayed particles on the
textured pattern in FIG. 12-1;
[0060] FIG. 13-1 shows formation of a sprayed coating on textured
patterns with a distance of 90 .mu.m according to the ninth
embodiment of the present disclosure or textured patterns with a
diameter of 100 .mu.m according to the tenth embodiment of the
present disclosure;
[0061] FIG. 13-2 shows deposition of sprayed particles on the
textured pattern in FIG. 13-1;
[0062] FIG. 14-1 shows formation of a sprayed coating on textured
patterns with a distance of 110 .mu.m according to the ninth
embodiment of the present disclosure or textured patterns with a
diameter of 120 .mu.m according to the tenth embodiment of the
present disclosure;
[0063] FIG. 14-2 shows deposition of sprayed particles on the
textured pattern in FIG. 14-1;
[0064] FIG. 15 shows testing results of an influence of a distance
on adhesion strength according to the ninth embodiment of the
present disclosure;
[0065] FIG. 16 shows testing results of an influence of a diameter
on adhesion strength according to the tenth embodiment of the
present disclosure;
[0066] FIG. 17 shows testing results of an influence of a width of
a channel-shaped textured pattern on adhesion strength according to
an eleventh embodiment of the present disclosure;
[0067] FIG. 18 shows testing results of an influence of a length of
a channel-shaped textured pattern on adhesion strength according to
a twelfth embodiment of the present disclosure;
[0068] FIG. 19 shows testing results of an influence of a side
length of a square textured pattern on adhesion strength according
to a thirteenth embodiment of the present disclosure;
[0069] FIG. 20 shows testing results of an influence of a side
length of a regular-hexagonal textured pattern on adhesion strength
according to a fourteenth embodiment of the present disclosure;
[0070] FIG. 21 shows testing results of an influence of a
single-shaped pattern and a combination-shaped pattern on adhesion
strength according to a fifteenth embodiment of the present
disclosure;
[0071] FIG. 22 shows testing results of an influence of the
combination-shaped patterns with different dimensions on adhesion
strength according to the fifteenth embodiment of the present
disclosure;
[0072] FIG. 23 shows testing results of an influence of a
single-shaped pattern and a combination-shaped pattern on adhesion
strength according to a sixteenth embodiment of the present
disclosure;
[0073] FIG. 24 shows testing results of an influence of the
combination-shaped patterns with different dimensions on adhesion
strength according to the sixteenth embodiment of the present
disclosure;
[0074] FIG. 25 shows testing results of an influence of a
single-shaped pattern and a combination-shaped pattern on adhesion
strength according to a seventeenth embodiment of the present
disclosure;
[0075] FIG. 26 shows testing results of an influence of the
combination-shaped pattern with different dimensions on adhesion
strength according to the seventeenth embodiment of the present
disclosure;
[0076] FIG. 27 shows testing results of an influence of a
single-shaped pattern and a combination-shaped pattern on adhesion
strength according to an eighteenth embodiment of the present
disclosure;
[0077] FIG. 28 shows testing results of an influence of the
combination-shaped patterns with different dimensions on adhesion
strength according to the eighteenth embodiment of the present
disclosure;
[0078] FIG. 29 shows testing results of an influence of a
single-shaped pattern and a combination-shaped pattern on adhesion
strength according to a nineteenth embodiment of the present
disclosure;
[0079] FIG. 30 shows testing results of an influence of the
combination-shaped patterns with different dimensions on adhesion
strength according to the nineteenth embodiment of the present
disclosure;
[0080] FIG. 31 shows testing results of an influence of a
single-shaped pattern and a combination-shaped pattern on adhesion
strength according to a twentieth embodiment of the present
disclosure; and
[0081] FIG. 32 shows testing results of an influence of the
combination-shaped patterns with different dimensions on adhesion
strength according to the twentieth embodiment of the present
disclosure.
DETAILED DESCRIPTION OF THE EMBODIMENTS
[0082] The present disclosure aims to provide a method for
improving adhesion strength of a coating, which, as a processing
before spraying, can improve a bonding force between the coating
and a substrate, so that the sprayed coating can be applied into
the engineering practices with a long service life.
[0083] A structure for improving adhesion strength of a coating is
further provided in the present disclosure.
[0084] The advantageous effects of the present disclosure are
further described below in conjunction with the embodiments. It
should be understood that the embodiments are only intended to
exemplify the technical solution and are not intended to limit the
protection scope of the present disclosure.
[0085] A method for improving adhesion strength of a coating is
provided according to an embodiment of the present disclosure,
which includes step 1) to step 3).
[0086] In step 1), textured patterns are prepared. At least one
type of pattern is textured on a surface of a substrate using a
laser process based on bionics. The substrate is preferably made of
a stainless steel, and more preferably is made of FV520B.
[0087] In step 2), a parameter is regulated. A spraying process
parameter is regulated based on a parameter of the textured
patterns formed in step 1).
[0088] In step 3), a coating is sprayed. Spraying is performed on
the substrate obtained in step 1) using a supersonic plasma
spraying method.
[0089] The adhesion strength of the coating can be tested. A
geometrical form of texture before the coating is sprayed and an
SEM form of a cross section of the coating after the coating is
sprayed are observed using a scanning electron microscope. A
bar-shaped part is adhered onto a surface of the coating using an
adhesive paper. A force for peeling the coating off the substrate
by pulling the part is measured, to obtain an adhesion force of the
coating.
[0090] In the method provided in the present disclosure, a laser
texturing method is used for controlling a parameter of a laser
process, to obtain textured geometrical patterns with dimensions
arranged regularly at a density on the surface of the substrate.
The method, as a processing before spraying, can improve a bonding
force between the coating and the substrate, so that the sprayed
coating can be applied into the engineering practices with a long
service life. Also, the spraying process parameter is regulated
based on the parameter of the textured pattern, the adhesion
strength of the sprayed coating changes with the parameter of the
textured patterns and the spraying process parameter, thereby
optimizing the parameter of the textured pattern.
[0091] In the embodiment, the parameter of the textured patterns
includes one of a pattern shape, a pattern distance, a pattern
dimension and pattern arrangement, or a combination thereof. The
spraying process parameter is regulated based on one or more of the
pattern shape, the pattern distance, the pattern dimension and the
pattern arrangement of the textured patterns formed in step 1).
Therefore, the spraying process parameter is optimized, such that
optimal adhesion strength between the coating and the substrate can
be realized based on the parameter of the textured patterns and the
spraying process parameter.
[0092] The pattern shape includes one of a channel shape, a square,
a regular hexagon and a circle, or a combination thereof. The
textured pattern may be in a single pattern shape, and may also be
in a shape of a combination of any two or more of the pattern
shapes.
[0093] Furthermore, the pattern dimension includes one of a depth,
a side length, a width and a diameter, or a combination thereof.
Different pattern dimensions are taken into account for the
patterns in different shapes. For example, the pattern dimension
for the square and the regular hexagon includes the side length and
the depth. The pattern dimension for the circle includes the depth
and the diameter. The pattern dimension for the channel shape
includes the width and the depth. In a case that the textured
patterns are in a shape of a combination of multiple pattern
shapes, the pattern dimensions may be a combination of various
dimensions correspondingly.
[0094] Furthermore, according to the embodiment, before step 1),
the method for improving adhesion strength of the coating further
include a substrate preprocessing step including polishing and
cleaning the surface of the substrate, to facilitate subsequent
processing of the textured patterns and the spraying process,
thereby improving a spraying effect.
[0095] The spraying process parameter is regulated below with
taking different pattern shapes of the textured patterns as a
parameter, which is described in the following embodiment in
detail.
First Embodiment
[0096] A method for improving adhesion strength of a coating is
provided in the present embodiment. The pattern shape is a channel
shape, as shown in FIG. 1-1. The method includes step S11 to
S14.
[0097] In step S11, a substrate is preprocessed. A surface of the
substrate is polished and cleaned to remove impurities on the
surface of the substrate and improve a spraying effect.
[0098] In step S12, textured patterns are prepared. Channel-shaped
patterns are textured on the surface of the substrate using a laser
process based on bionics.
[0099] In step S13, a parameter is regulated. A spraying process
parameter is regulated based on a complexity degree of the textured
patterns formed in step S12, so that the different textured
patterns have the same processing depth. For the channel-shaped
textured patterns, a laser power is selected to be 14 W, a scanning
speed is selected to be 600 mm/s, a frequency is selected to be 20
HZ, and the number of processing is selected to be 2.
[0100] In step S14, a coating is sprayed. Spraying is performed on
the substrate obtained in step S12 using a supersonic plasma
spraying method. A selected spraying device is a high efficient GTV
F6 plasma spraying device of the General Research Institute of
Mining and Metallurgy. The spraying process parameter includes a
spraying voltage of 120V, a spraying current of 440 A, a spraying
power of 55 kW, and a spraying distance of 100 mm. Therefore, a
coating with a depth is obtained.
[0101] The adhesion strength of the coating can be tested. A
geometrical form of texture before the coating is sprayed and an
SEM form of a cross section of the coating after the coating is
sprayed are observed using a scanning electron microscope, and a
bar-shaped part is adhered onto a surface of the coating using an
adhesive paper, and a force for peeling the coating off the
substrate by pulling the part is measured, to obtain an adhesion
force of the coating.
Second Embodiment
[0102] A method for improving adhesion strength of a coating is
provided in the present embodiment. A pattern shape is a square, as
shown in FIG. 2-1. The method includes the following steps S22 and
S23 in addition to the same steps as the method described
above.
[0103] In step S22, textured patterns are prepared. Square patterns
are textured on the surface of the substrate using a laser process
based on bionics.
[0104] In step S23, a parameter is regulated. A spraying process
parameter is regulated based on a complexity degree of the textured
patterns formed in step S22, so that the different textured
patterns have the same processing depth. For the square textured
patterns, a laser power is selected to be 14 W, a scanning speed is
selected to be 600 mm/s, a frequency is selected to be 20 HZ, and
the number of processing is selected to be 2.
Third Embodiment
[0105] A method for improving adhesion strength of a coating is
provided in the present embodiment. A pattern shape is a regular
hexagon, as shown in FIG. 3-1. The method includes steps S32 and
S33.
[0106] In step S32, textured patterns are prepared. Hexagonal
patterns are textured on the surface of the substrate using a laser
process based on bionics.
[0107] In step S33, a parameter is regulated. A spraying process
parameter is regulated based on a complexity degree of the textured
patterns formed in step S32, so that the different textured
patterns have the same processing depth. For the hexagonal textured
pattern, a laser power is 12 W, a scanning speed is 4000 mm/s, a
frequency is 20 HZ, and the number of processing is 1.
Comparative Example
[0108] In order to measure performances of the coating, a
geometrical form of texture after the coating is sprayed is
observed using a Nova NanoSEM450 model of scanning electron
microscope. In order to measure an influence of different textured
patterns on an anti-fatigue performance of the sprayed coating, a
fatigue performance of the sprayed coating is measured using a
rolling-contact fatigue testing machine.
[0109] Adhesion strength between the coating and the substrate is
tested using a tensile testing machine under conditions of
different shapes textured on the surface of the substrate. The
tensile testing machine is an MTS809 mode of electronic universal
material testing machine. The tensile test is performed after the
coating is sprayed on the textured patterns in different shapes
prepared in the above embodiments. The adhesion strength is
indicated by a ratio of a force under which the coating fractures
from the substrate to the area of the coating.
[0110] The form of the channel-shaped textured patterns according
to the first embodiment is as shown in FIG. 1-1, and adhesion
strength of the channel-shaped textured patterns is as shown in
FIG. 1-2. The form of the square textured patterns according to the
second embodiment is as shown in FIG. 2-1, and adhesion strength of
the square textured patterns is as shown in FIG. 2-2. The form of
the hexagonal textured pattern according to the third embodiment is
as shown in FIG. 3-1, and adhesion strength of the hexagonal
textured patterns is as shown in FIG. 3-2.
[0111] Testing results are as shown in Table 1. The adhesion
strength between the coating and the substrate are different
significantly for different shapes textured on the surface of the
substrate, and the adhesion strength of the coating is
significantly improved with the textured patterns. The adhesion
strength of the coating changes with the shape of the textured
patterns. The adhesion strength of the channel-shaped textured
patterns is at a maximum value 57 MPa. The adhesion strength of the
hexagonal textured patterns is at an intermediate value 46 MPa. The
adhesion strength of the square textured patterns is at a minimum
value 33 MPa.
TABLE-US-00001 TABLE 1 Comparison of Adhesion strength of Coating
for Different Textured Patterns Pattern shape Channel shape Square
Hexagon Adhesion strength 57 MPa 33 MPa 46 MPa
[0112] In addition to the fact of the shape of the textured
pattern, the adhesion strength changes with a density of the same
textured pattern. A ratio of the area of the textured patterns on
the surface of the substrate or the coating to the area of the
substrate or the coating indicates the density of the textured
patterns. In order to measure an influence of the density of the
textured patterns on the adhesion strength, a density of the square
textured patterns is selected, and fatigue testing is performed on
the prepared square textured patterns at different densities. A
testing machine used is a normal testing machine. Testing results
are as shown in FIG. 4, which shows a change of adhesion strength
of the coating with a grid texturing density. It can be seen that
the adhesion strength of the coating changes with the texturing
density, and the adhesion strength shows a trend of rising first
and then falling. The texturing density has an optimal value. The
adhesion strength of the coating is best in a case that the density
of the square textured patterns is 30%.
[0113] It can be seen from the comparative example and the
embodiments described above that the adhesion strength of the
sprayed coating is changed by changing the shape of the textured
patterns with the method in the present disclosure. The adhesion
strength of the sprayed coating can change with the shape of the
textured patterns. As compared with the existing texturing method
for improving the strength of the coating, the parameter of the
textured patterns is optimized. In the present disclosure, a laser
texturing method is used for controlling a parameter of a laser
process, to obtain textured geometrical patterns with some
dimensions arranged regularly at a density on the surface of the
substrate. The method, as a processing before spraying, improves a
bonding force between the coating and the substrate, so that the
sprayed coating can be applied into the engineering practices with
a long service life.
[0114] A structure for improving adhesion strength of a coating is
further provided in the present disclosure, which includes a
substrate, textured patterns having at least one type of pattern
prepared on the substrate and a coating sprayed on the textured
patterns. The textured patterns may be in a shape of one of a
square, a channel shape and a hexagon, or a combination thereof.
The substrate is made of stainless steel, and the coating is a
NiCrBSi coating.
[0115] The spraying process parameter is regulated below with
taking different pattern dimensions of single-shaped textured
patterns as parameters. The spraying process parameter is regulated
with taking a depth, a diameter and a distance of the patterns as
parameters, which is described in the following embodiment in
detail.
Fourth Embodiment
[0116] A method for improving adhesion strength of a coating is
provided in the present embodiment, in which, a depth, a diameter
and a distance of textured patterns are regulated to improve the
adhesion strength of the coating. The depth of the textured pattern
is 35 .mu.m. The method includes the following steps S42 and S43 in
addition to the same steps as the above embodiment.
[0117] In step S42, textured patterns are prepared. The patterns
with the depth of 35 .mu.m are textured on a surface of a substrate
using a laser process based on bionics.
[0118] In step S43, a parameter is regulated. A distance of the
textured patterns and a spraying process parameter are regulated
based on the depth of the textured patterns formed in step S42 in
conjunction with different diameters, so that the different
textured patterns have the same processing density.
[0119] In a case that the diameter of the textured pattern is 40
.mu.m and the distance of the textured patterns is 60 .mu.m, a
laser power is 16 W, a scanning speed is 700 mm/s, a frequency is
20 HZ, and the number of processing is 1.
[0120] In a case that the diameter of the textured pattern is 50
.mu.m and the distance of the textured patterns is 75 .mu.m, a
laser power is 16 W, a scanning speed is 700 mm/s, a frequency is
20 HZ, and the number of processing is 1.
[0121] In a case that the diameter of the textured pattern is 60
.mu.m and the distance of the textured patterns is 90 .mu.m, a
laser power is 16 W, a scanning speed is 700 mm/s, a frequency is
20 HZ, and the number of processing is 1.
Fifth Embodiment
[0122] A method for improving adhesion strength of a coating is
provided according to the embodiment of the present disclosure, in
which, a depth, a diameter and a distance of textured patterns are
regulated to improve the adhesion strength of the coating. The
depth of the textured patterns is 55 .mu.m. The method includes the
following steps S52 and S53 in addition to the same steps as the
above embodiment.
[0123] In step S52, textured patterns are prepared. The patterns
with the depth of 55 .mu.m are textured on a surface of a substrate
using a laser process based on bionics.
[0124] In step S53, a parameter is regulated. A distance of the
textured patterns and a spraying process parameter are regulated
based on the depth of the textured patterns formed in step S52 in
conjunction with different diameters, so that the different
textured patterns have the same processing density.
[0125] In a case that the diameter of the textured pattern is 40
.mu.m and the distance of the textured patterns is 60 .mu.m, a
laser power is 12 W, a scanning speed is 800 mm/s, a frequency is
20 HZ, and the number of processing is 2.
[0126] In a case that the diameter of the textured pattern is 50
.mu.m and the distance of the textured patterns is 75 .mu.m, a
laser power is 12 W, a scanning speed is 800 mm/s, a frequency is
20 HZ, and the number of processing is 2.
[0127] In a case that the diameter of the textured pattern is 60
.mu.m and the distance of the textured patterns is 90 .mu.m, a
laser power is 12 W, a scanning speed is 800 mm/s, a frequency is
20 HZ, and the number of processing is 2.
Sixth Embodiment
[0128] A method for improving adhesion strength of a coating is
provided according to the embodiment of the present disclosure, in
which, a depth, a diameter and a distance of textured patterns are
regulated to improve the adhesion strength of the coating. The
depth of the textured patterns is 75 .mu.m. The method includes the
following steps S62 and S63 in addition to the same steps as the
above embodiment.
[0129] In step S62, textured patterns are prepared. The patterns
with the depth of 75 .mu.m are textured on a surface of a substrate
using a laser process based on bionics.
[0130] In step S63, a parameter is regulated. A distance of the
textured patterns and a spraying process parameter are regulated
based on the depth of the textured patterns formed in step S62 in
conjunction with different diameters, so that the different
textured patterns have the same processing density.
[0131] In a case that the diameter of the textured pattern is 40
.mu.m and the distance of the textured patterns is 60 .mu.m, a
laser power is 14 W, a scanning speed is 600 mm/s, a frequency is
20 HZ, and the number of processing is 2.
[0132] In a case that the diameter of the textured pattern is 50
.mu.m and the distance of the textured patterns is 75 .mu.m, a
laser power is 14 W, a scanning speed is 600 mm/s, a frequency is
20 HZ, and the number of processing is 2.
[0133] In a case that the diameter of the textured pattern is 60
.mu.m and the distance of the textured patterns is 90 .mu.m, a
laser power is 14 W, a scanning speed is 600 mm/s, a frequency is
20 HZ, and the number of processing is 2.
Seventh Embodiment
[0134] A method for improving adhesion strength of a coating is
provided according to the embodiment of the present disclosure, in
which, a depth, a diameter and a distance of textured patterns are
regulated to improve the adhesion strength of the coating. The
depth of the textured pattern is 95 .mu.m. The method includes the
following steps S72 and S73 in addition to the same steps as the
above embodiment.
[0135] In step S72, textured patterns are prepared. The patterns
with the depth of 95 .mu.m are textured on a surface of a substrate
using a laser process based on bionics.
[0136] In step S73, a parameter is regulated. A distance of the
textured patterns and a spraying process parameter are regulated
based on the depth of the textured patterns formed in step S72 in
conjunction with different diameters, so that the different
textured patterns have the same processing density.
[0137] In a case that the diameter of the textured pattern is 40
.mu.m and the distance of the textured patterns is 60 .mu.m, a
laser power is 16 W, a scanning speed is 600 mm/s, a frequency is
20 HZ, and the number of processing is 2.
[0138] In a case that the diameter of the textured pattern is 50
.mu.m and the distance of the textured patterns is 75 .mu.m, a
laser power is 16 W, a scanning speed is 600 mm/s, a frequency is
20 HZ, and the number of processing is 2.
[0139] In a case that the diameter of the textured pattern is 60
.mu.m and the distance of the textured patterns is 90 .mu.m, a
laser power is 16 W, a scanning speed is 600 mm/s, a frequency is
20 HZ, and the number of processing is 2.
Eighth Embodiment
[0140] A method for improving adhesion strength of a coating is
provided according to the embodiment of the present disclosure, in
which, a depth, a diameter and a distance of textured patterns are
regulated to improve the adhesion strength of the coating. The
depth of the textured pattern is 115 .mu.m. The method includes the
following steps S82 and S83 in addition to the same steps as the
above embodiment.
[0141] In step S82, textured patterns are prepared. The patterns
with the depth of 115 .mu.m are textured on a surface of a
substrate using a laser process based on bionics.
[0142] In step S83, a parameter is regulated. A distance of the
textured patterns and a spraying process parameter are regulated
based on the depth of the textured patterns formed in step S82 in
conjunction with different diameters, so that the different
textured patterns have the same processing density.
[0143] In a case that the diameter of the textured pattern is 40
.mu.m and the distance of the textured patterns is 60 .mu.m, a
laser power is 18 W, a scanning speed is 500 mm/s, a frequency is
20 HZ, and the number of processing is 2.
[0144] In a case that the diameter of the textured pattern is 50
.mu.m and the distance of the textured patterns is 75 .mu.m, a
laser power is 18 W, a scanning speed is 500 mm/s, a frequency is
20 HZ, and the number of processing is 2.
[0145] In a case that the diameter of the textured pattern is 60
.mu.m and the distance of the textured patterns is 90 .mu.m, a
laser power is 18 W, a scanning speed is 500 mm/s, a frequency is
20 HZ, and the number of processing is 2.
[0146] In the above embodiments, a list of the process parameters
is as shown in Table 2 for different structure parameters of the
textured patterns.
TABLE-US-00002 TABLE 2 Comparison of Process Parameters for
Different Structure Parameters Parameters of textured patterns
Power Scanning The number (F(D)-[H]-<L>) (W) speed of
scanning F40-35-60, F50-35-75, F60-35-90 16 700 1 F40-55-60,
F50-55-75, F60-55-90 12 800 2 F40-75-60, F50-75-75, F60-75-90 14
600 2 F40-95-60, F50-95-75, F60-95-90 16 600 2 F40-115-60,
F50-115-75, F60-115-90 18 500 2
[0147] In the above Table, F denotes that a material of the
substrate is FV520B, D denotes the diameter, H denotes the depth,
and L denotes the distance.
Comparative Example
[0148] The tensile test is performed after the coating is sprayed
on the textured patterns with different depths prepared in the
above embodiments. The adhesion strength is indicated by a ratio of
a force under which the coating fractures from the substrate to the
area of the coating.
[0149] In the comparative experiment, the fourth embodiment, the
sixth embodiment and the eighth embodiment are selected as the
comparative examples. The depth of the textured patterns in the
fourth embodiment is 35 .mu.m, the form of the textured patterns
with the diameter of 40 .mu.m is as shown in FIG. 5-1, the form of
the textured patterns with the diameter of 50 .mu.m is as shown in
FIG. 5-2, and the form of the textured patterns with the diameter
of 60 .mu.m is as shown in FIG. 5-3. The depth of the textured
patterns in the sixth embodiment is 75 .mu.m, the form of the
textured patterns with the diameter of 40 .mu.m is as shown in FIG.
6-1, the form of the textured patterns with the diameter of 50
.mu.m is as shown in FIG. 6-2, and the form of the textured
patterns with the diameter of 60 .mu.m is as shown in FIG. 6-3. The
depth of the textured patterns in the eighth embodiment is 115
.mu.m, the form of the textured patterns with the diameter of 40
.mu.m is as shown in FIG. 7-1, the form of the textured patterns
with the diameter of 50 .mu.m is as shown in FIG. 7-2, and the form
of the textured patterns with the diameter of 60 .mu.m is as shown
in FIG. 7-3.
[0150] The experiment results of the tensile tests performed for
the above selected comparative examples are as shown in FIG. 8 and
FIG. 9. FIG. 8 is a curve diagram of comparison of adhesion
strength of the sprayed coating for different textured patterns. It
can be seen from the curve diagram that, in a case that the depth
is 75 .mu.m, the adhesion strength is at a maximum value whether
the diameter is 40 .mu.m, 50 .mu.m or 60 .mu.m. In a case that the
depth is less than 75 .mu.m, the adhesion strength is directly
proportional to the depth, that is, the adhesion strength increases
with an increase in the depth. In a case that the depth is greater
than 75 .mu.m, the adhesion strength is inversely proportional to
the depth, that is, the adhesion strength decreases with the
increase in the depth.
[0151] FIG. 9 is a curve diagram of changes of contact area and the
adhesion strength of the sprayed coating with an increase in a
depth of the textured patterns. It can be seen from the curve
diagram that in a case that the depth is 75 .mu.m, the adhesion
strength is at the maximum value. In a case that the depth is less
than 75 .mu.m, the adhesion strength is directly proportional to
the depth, that is, the adhesion strength increases with an
increase in the depth. In a case that the depth is greater than 75
.mu.m, the adhesion strength is inversely proportional to the
depth, that is, the adhesion strength decreases with the increase
in the depth. The contact area is always directly proportional to
the depth, that is, the contact area increases with an increase in
the depth. The line of contact area and the line of bonding
strength have an intersection at a point of a depth between 80
.mu.m to 90 .mu.m
[0152] In the above diagram, D denotes the diameter, H denotes the
depth and L denotes the distance.
[0153] The spraying process parameter is regulated below with
taking a single pattern dimension of a single shape of textured
patterns as a parameter, which is described in the following
embodiment in detail.
Ninth Embodiment
[0154] A method for improving adhesion strength of a coating is
provided in the present embodiment, in which, a distance of
textured patterns is regulated to improve adhesion strength of the
coating. The pattern shape is a circle, and a distance of the
patterns is 30 .mu.m, 50 .mu.m, 70 .mu.m, 90 .mu.m or 110 .mu.m,
and a diameter of the pattern is 80 .mu.m. The method includes step
S92 and S93 in addition the same steps as the above embodiment.
[0155] In step S92, textured patterns are prepared. Circular
patterns are textured on the surface of the substrate using a laser
process based on bionics, to form textured patterns with the
distance of 30 .mu.m, 50 .mu.m, 70 .mu.m, 90 .mu.m or 110 .mu.m and
a diameter of 80 .mu.m.
[0156] In step S93, a parameter is regulated. A spraying process
parameter is regulated based on the distance of the textured
patterns formed in step S92 and the diameter of the single circular
pattern, so that the different textured patterns have the same
processing depth. For the textured patterns with the distance of 30
.mu.m, 50 .mu.m, 70 .mu.m, 90 .mu.m or 110 .mu.m and a diameter of
80 .mu.m, a laser power is 16 W, a scanning speed is 800 mm/s, and
the number of processing is 1.
Comparative Example
[0157] The tensile test is performed after the coating is sprayed
on the textured patterns with different distances prepared in the
above embodiment. The adhesion strength is indicated by a ratio of
a force under which the coating fractures from the substrate to the
area of the coating.
[0158] Formation of the sprayed coating for the textured patterns
with the distance of 30 .mu.m is as shown in FIG. 10-1, and
deposition of sprayed particles is as shown in FIG. 10-2. Formation
of the sprayed coating for the textured patterns with the distance
of 50 .mu.m is as shown in FIG. 11-1, and deposition of sprayed
particles is as shown in FIG. 11-2. Formation of the sprayed
coating for the textured patterns with the distance of 70 .mu.m is
as shown in FIG. 12-1, and deposition of sprayed particles is as
shown in FIG. 12-2. Formation of the sprayed coating for the
textured patterns with the distance of 90 .mu.m is as shown in FIG.
13-1, and deposition of the sprayed particles is as shown in FIG.
13-2. Formation of the sprayed coating for the textured patterns
with the distance of 110 .mu.m is as shown in FIG. 14-1, and
deposition of sprayed particles is as shown in FIG. 14-2.
[0159] The testing results are as shown in FIG. 15. Adhesion
strength between the coating and the substrate are significantly
different for different distances of the same circular textured
patterns. The adhesion strength of the coating changes with the
distance. The adhesion strength is inversely proportional to the
distance of the patterns. The adhesion strength decreases with an
increase in the distance of the patterns. The adhesion strength
increases with a decrease in the distance of the patterns.
[0160] A structure for improving adhesion strength of a coating is
further provided in the present disclosure, which includes a
substrate, circular textured patterns prepared on the substrate,
and a coating sprayed on the textured patterns. A diameter of the
textured pattern is 80 .mu.m, and a distance of the patterns is at
least one of 30 .mu.m, 50 .mu.m, 70 .mu.m, 90 .mu.m or 110
.mu.m.
[0161] The substrate is made of stainless steel, and the coating is
a NiCrBSi ceramic coating.
Tenth Embodiment
[0162] A method for improving adhesion strength of a coating is
provided in the present embodiment, in which, a recess diameter of
textured patterns is regulated to improve the adhesion strength of
the coating. A pattern shape is a circle, and a distance of the
patterns is 70 .mu.m, a diameter of the pattern is 40 .mu.m, 60
.mu.m, 80 .mu.m, 100 .mu.m or 120 .mu.m. The method includes the
following steps S102 and S103 in addition to the same steps as the
above embodiment.
[0163] In step S102, textured patterns are prepared. Circular
patterns are textured on a surface of a substrate using a laser
process based on bionics.
[0164] In step S103, a parameter is regulated. A spraying process
parameter and a parameter of the textured patterns are regulated
based on the textured patterns formed in step S102, to obtain
textured patterns with a diameter of 40 .mu.m, 60 .mu.m, 80 .mu.m,
100 .mu.m or 120 .mu.m and a distance of 70 .mu.m. A laser power is
16 W, a scanning speed is 800 mm/s, and the number of processing is
1.
Comparative Example
[0165] Formation of the sprayed coating for the textured pattern
with the diameter of 40 .mu.m is as shown in FIG. 10-1, and
deposition of sprayed particles is as shown in FIG. 10-2. Formation
of the sprayed coating for the textured pattern with the diameter
of 60 .mu.m is as shown in FIG. 11-1, and deposition of sprayed
particles is as shown in FIG. 11-2. Formation of the sprayed
coating for the textured pattern with the diameter of 80 .mu.m is
as shown in FIG. 12-1, and deposition of the sprayed particles is
as shown in FIG. 12-2. Formation of the sprayed coating for the
textured pattern with the diameter of 100 .mu.m is as shown in FIG.
13-1, and deposition of sprayed particles is as shown in FIG. 13-2.
Formation of the sprayed coating for the textured pattern with the
diameter of 120 .mu.m is as shown in FIG. 14-1, and deposition of
sprayed particles is as shown in FIG. 14-2.
[0166] The testing results are as shown in FIG. 16. Adhesion
strength between the coating and the substrate are different
significantly for different diameters of the same circular textured
patterns. The adhesion strength is at a minimum value 33 MPa in a
case that the diameter is 40 .mu.m. The adhesion strength is at a
maximum value 43 MPa in a case that the diameter is 120 .mu.m. The
adhesion strength is 41 MPa in a case that the diameter is 60
.mu.m. The adhesion strength is 42 MPa in a case that the diameter
is 80 .mu.m. The adhesion strength is 40.5 MPa in a case that the
diameter is 100 .mu.m. The adhesion strength is directly
proportional to the diameter in a case that the diameter ranges
from 40 .mu.m to 60 .mu.m. The adhesion strength is directly
proportional to the diameter in a case that the diameter ranges
from 60 .mu.m to 80 .mu.m. A slope of a directly-proportional line
in a case that the diameter ranges from 60 .mu.m to 80 .mu.m is
less than a slope of a directly-proportional line in a case that
the diameter ranges from 40 .mu.m to 60 .mu.m. The adhesion
strength is inversely proportional to the diameter in a case that
the diameter ranges from 80 .mu.m to 100 .mu.m. The adhesion
strength is directly proportional to the diameter in a case that
the diameter ranges from 100 .mu.m to 120 .mu.m.
[0167] A structure for improving adhesion strength of a coating is
further provided according to the embodiment of the present
disclosure, which includes a substrate, circular textured patterns
prepared on the substrate, and a coating sprayed on the textured
patterns. A distance of the textured patterns is 70 .mu.m, and a
diameter of the pattern is at least one of 40 .mu.m, 60 .mu.m, 80
.mu.m, 100 .mu.m or 120 .mu.m. The substrate is made of stainless
steel, and furthermore is made of FV520B, and the coating is a
NiCrBSi ceramic coating.
Eleventh Embodiment
[0168] A method for improving adhesion strength of a coating is
provided in the present embodiment, in which, a width of a
channel-shaped textured pattern is regulated to improve the
adhesion strength of the coating. The method includes the following
steps S112 and S113 in addition to the same steps as the above
embodiment.
[0169] In step S112, textured patterns are prepared. Channel-shaped
patterns are textured on a surface of a substrate using a laser
process based on bionics.
[0170] In step S113, a parameter is regulated. A spraying process
parameter and a parameter of the textured patterns are regulated
based on the textured patterns formed in step S112, to obtain
textured patterns with a width of 10 .mu.m and a distance of 60
.mu.m, textured patterns with a width of 15 .mu.m and a distance of
60 .mu.m, textured patterns with a width of 20 .mu.m and a distance
of 60 .mu.m, or textured patterns with a width of 30 .mu.m and a
distance of 60 .mu.m.
[0171] For the channel-shaped textured patterns with the shape
parameters, a laser power is 14 W, a scanning speed is 800 mm/s,
and the number of processing is 2.
Comparative Example
[0172] The tensile test is performed after the coating is sprayed
on the textured patterns with different widths prepared in the
above embodiment. The adhesion strength is indicated by a ratio of
a force under which the coating fractures from the substrate to the
area of the coating.
[0173] The testing results are as shown in FIG. 17. Adhesion
strength between the coating and the substrate are different
significantly for different widths of the same channel-shaped
textured patterns. Comparison of the adhesion strength
corresponding to the different widths is as shown in the following
Table.
TABLE-US-00003 TABLE 3 Comparison of Adhesion strength
corresponding to Different Widths Width of a channel shape 10 .mu.m
15 .mu.m 20 .mu.m 30 .mu.m Adhesion strength 25.5 MPa 32 MPa 46 MPa
51 MPa
[0174] The adhesion strength is at a minimum value 25.5 MPa in a
case that the width of the channel-shaped textured pattern is 10
.mu.m. The adhesion strength is at a maximum value 51 MPa in a case
that the width of the channel-shaped textured pattern is 30 .mu.m.
The adhesion strength is 32 MPa in a case that the width is 15
.mu.m. The adhesion strength is 46 MPa in a case that the width is
20 .mu.m. In a case that the width ranges from 10 .mu.m to 20
.mu.m, the adhesion strength is directly proportional to the width,
as a first directly-proportional line. In a case that the width
ranges from 20 .mu.m to 30 .mu.m, the adhesion strength is directly
proportional to the width, as a second directly-proportional line.
A slope of the first directly-proportional line is greater than a
slope of the second directly-proportional line.
[0175] A structure for improving adhesion strength of a coating is
provided according to the embodiment of the present disclosure,
which includes a substrate, channel-shaped textured patterns
prepared on the substrate, and a coating sprayed on the
channel-shaped textured patterns. A distance of the textured
patterns is 60 .mu.m, and a width of the channel-shaped pattern is
at least one of 10 .mu.m, 15 .mu.m, 20 .mu.m or 30 .mu.m. The
substrate is made of stainless steel, and furthermore is made of
FV520B, and the coating is a NiCrBSi ceramic coating.
Twelfth Embodiment
[0176] A method for improving adhesion strength of a coating is
provided in the present embodiment, in which, a length of a
channel-shaped textured pattern is regulated to improve the
adhesion strength of the coating. The method includes the following
steps S122 and S123 in addition to the same steps as the above
embodiment.
[0177] In step S122, textured patterns are prepared. Channel-shaped
patterns are textured on a surface of a substrate using a laser
process based on bionics.
[0178] In step S123, a parameter is regulated. A spraying process
parameter and a parameter of the textured patterns are regulated
based on the textured patterns formed in step S122, to obtain
textured patterns with a length of 20 .mu.m, a width of 15 .mu.m
and a distance of 60 .mu.m, textured patterns with a length of 35
.mu.m, a width of 15 .mu.m and a distance of 60 .mu.m, textured
patterns with a length of 45 .mu.m, a width of 15 .mu.m and a
distance of 60 .mu.m, or textured patterns with a length of 55
.mu.m, a width of 15 .mu.m and a distance of 60 .mu.m.
[0179] For the channel-shaped textured patterns with the
parameters, a laser power is 16 W, a scanning speed is 1000 mm/s,
and the number of processing is 2.
Comparative Example
[0180] The tensile test is performed after the coating is sprayed
on the textured patterns with different lengths prepared in the
above embodiment. The adhesion strength is indicated by a ratio of
a force under which the coating fractures from the substrate to the
area of the coating.
[0181] The testing results are as shown in FIG. 18. Adhesion
strength between the coating and the substrate are different
significantly for different lengths of the same channel-shaped
textured patterns. Comparison of the adhesion strength
corresponding to the different lengths is as shown in the following
Table.
TABLE-US-00004 TABLE 4 Comparison of Adhesion strength
corresponding to Different Lengths Length of a channel shape 20
.mu.m 30 .mu.m 45 .mu.m 55 .mu.m Adhesion strength 32 MPa 38 MPa 55
MPa 47 MPa
[0182] In a case that the width of the channel-shaped textured
pattern is fixed, the adhesion strength is at a minimum value 32
MPa in a case that the length of the channel-shaped textured
pattern is 20 .mu.m. The adhesion strength is at a maximum value 55
MPa in a case that the length of the channel-shaped textured
pattern is 45 .mu.m. The adhesion strength is 38 MPa in a case that
the length of the channel-shaped textured pattern is 30 .mu.m. The
adhesion strength is 47 MPa in a case that the length of the
channel-shaped textured pattern is 55 .mu.m. In a case that the
length ranges from 20 .mu.m to 45 .mu.m, the adhesion strength is
directly proportional to the length, as a directly-proportional
line. In a case that the length ranges from 45 .mu.m to 55 .mu.m,
the adhesion strength is inversely proportional to the length, as
an inversely-proportional line.
[0183] A structure for improving adhesion strength of a coating is
further provided according to the embodiment of the present
disclosure, which includes a substrate, channel-shaped textured
patterns prepared on the substrate, and a coating sprayed on the
channel-shaped textured patterns. A distance of the textured
patterns is 60 .mu.m, and a width of the channel-shaped pattern is
15 .mu.m, and the length of the channel-shaped pattern is at least
one of 20 .mu.m, 30 .mu.m, 45 .mu.m or 55 .mu.m. The substrate is
made of stainless steel, and furthermore is made of FV520B, and the
coating is a NiCrBSi ceramic coating.
Thirteenth Embodiment
[0184] A method for improving adhesion strength of a coating is
provided in the present embodiment, in which, a side length of a
square textured pattern is regulated to improve the adhesion
strength of the coating. The method includes the following steps
S132 and S133 in addition to the same steps as the above
embodiment.
[0185] In step S132, textured patterns are prepared. Square
patterns are textured on a surface of a substrate using a laser
process based on bionics.
[0186] In step S133, a parameter is regulated. A spraying process
parameter and a parameter of the textured patterns are regulated
based on the textured patterns formed in step S132, to obtain
textured patterns with a side length of 20 .mu.m and a distance of
60 .mu.m, textured patterns with a side length of 35 .mu.m and a
distance of 60 .mu.m, textured patterns with a side length of 55
.mu.m and a distance of 60 .mu.m, or textured patterns with a side
length of 70 .mu.m and a distance of 60 .mu.m.
[0187] For the textured patterns with the shape parameters, a laser
power is 15 W, a scanning speed is 900 mm/s, and the number of
processing is 1.
Comparative Example
[0188] The tensile test is performed after the coating is sprayed
on the textured patterns with different side lengths prepared in
the above embodiment. The adhesion strength is indicated by a ratio
of a force under which the coating fractures from the substrate to
the area of the coating.
[0189] The testing results are as shown in FIG. 19. Adhesion
strength between the coating and the substrate are different
significantly for different side lengths of the same square
textured patterns. Comparison of the adhesion strength
corresponding to the different side lengths is as shown in the
following Table.
TABLE-US-00005 TABLE 5 Comparison of Adhesion strength
corresponding to Different Side Lengths Side length of a square 20
.mu.m 35 .mu.m 55 .mu.m 70 .mu.m Adhesion strength 28 MPa 35.5 MPa
52 MPa 55.5 MPa
[0190] The adhesion strength is at a minimum value 28 MPa in a case
that the side length of the square textured pattern is 20 .mu.m.
The adhesion strength is at a maximum value 55.5 MPa in a case that
the side length of the square textured pattern is 70 .mu.m. The
adhesion strength is 35.5 MPa in a case that the side length of the
square textured pattern is 35 .mu.m. The adhesion strength is 52
MPa in a case that the side length of the square textured pattern
is 55 .mu.m. It can be seen that the adhesion strength increases
with an increase in the side length in a case that the side length
ranges from 20 .mu.m to 70 .mu.m.
[0191] A structure for improving adhesion strength of a coating is
further provided according to the embodiment of the present
disclosure, which includes a substrate, square textured patterns
prepared on the substrate, and a coating sprayed on the square
textured patterns. A distance between the square textured patterns
is 60 .mu.m, and a side length of the square textured pattern is at
least one of 20 .mu.m, 35 .mu.m, 55 .mu.m or 70 .mu.m. The
substrate is made of stainless steel, and furthermore is made of
FV520B, and the coating is a NiCrBSi ceramic coating.
Fourteenth Embodiment
[0192] A method for improving adhesion strength of a coating is
provided in the present embodiment, in which, a side length of a
regular-hexagonal textured pattern is regulated to improve the
adhesion strength of the coating. The method includes the following
steps S142 and S143 in addition to the same steps as the above
embodiment.
[0193] In step S142, textured patterns are prepared.
Regular-hexagonal patterns are textured on a surface of a substrate
using a laser process based on bionics.
[0194] In step S143, a parameter is regulated. A spraying process
parameter and a parameter of the textured patterns are regulated
based on the textured patterns formed in step S142, to obtain
textured patterns with a side length of 20 .mu.m and a distance of
65 .mu.m, textured patterns with a side length of 30 .mu.m and a
distance of 65 .mu.m, textured patterns with a side length of 45
.mu.m and a distance of 65 .mu.m, or textured patterns with a side
length of 60 .mu.m and a distance of 65 .mu.m.
[0195] For the regular-hexagonal textured patterns, a laser power
is 14 W, a scanning speed is 800 mm/s, and the number of processing
is 2.
Comparative Example
[0196] The tensile test is performed after the coating is sprayed
on the regular-hexagonal textured patterns prepared in the above
embodiment. The adhesion strength is indicated by a ratio of a
force under which the coating fractures from the substrate to the
area of the coating.
[0197] The testing results are as shown in FIG. 20. Adhesion
strength between the coating and the substrate are different
significantly for different side lengths of the same
regular-hexagonal textured patterns. Comparison of the adhesion
strength corresponding to the different side lengths are as shown
in the following Table.
TABLE-US-00006 TABLE 6 Comparison of Adhesion strength
corresponding to Different Side Lengths Side length of a hexagon 20
.mu.m 30 .mu.m 45 .mu.m 60 .mu.m Adhesion strength 28.5 MPa 31.5
MPa 55 MPa 53 MPa
[0198] The adhesion strength is at a minimum value 28.5 MPa in a
case that the side length of the regular-hexagonal textured pattern
is 20 .mu.m. The adhesion strength is at a maximum value 55 MPa in
a case that the side length of the regular-hexagonal textured
pattern is 45 .mu.m. The adhesion strength is 31.5 MPa in a case
that the side length of the regular-hexagonal textured pattern is
30 .mu.m. The adhesion strength is 53 MPa in a case that the side
length of the regular-hexagonal textured pattern is 60 .mu.m. The
adhesion strength is directly proportional to the side length in a
case that the side length ranges from 20 .mu.m to 45 .mu.m. The
adhesion strength is inversely proportional to the side length in a
case that the side length ranges from 45 .mu.m to 60 .mu.m. A slope
of the directly-proportional line is greater than a slope of the
inversely-proportional line.
[0199] A structure for improving adhesion strength of a coating is
further provided according to the embodiment of the present
disclosure, which includes a substrate, regular-hexagonal textured
patterns prepared on the substrate, and a coating sprayed on the
regular-hexagonal textured patterns. A distance of the
regular-hexagonal textured patterns is 65 .mu.m, and a side length
of the regular-hexagonal textured pattern is at least one of 20
.mu.m, 30 .mu.m, 45 .mu.m or 60 .mu.m. The substrate is made of
stainless steel, and furthermore is made of FV520B, and the coating
is a NiCrBSi ceramic coating.
[0200] The spraying process parameter is regulated with taking
different pattern dimensions of combination-shaped textured
patterns as a parameter, which is described in the following
embodiment in detail.
Fifteenth Embodiment
[0201] A method for improving adhesion strength of a coating is
provided in the present embodiment, in which, a width of a
channel-shaped pattern and a diameter of a circular pattern in a
pattern formed by alternately combining channel shapes and circles
are regulated to improve the adhesion strength of the coating. The
method includes the following steps S152 and S153 in addition to
the same steps as the above embodiments.
[0202] In step S152, textured patterns are prepared.
Combination-shaped patterns formed by alternately combining channel
shapes and circles are textured on a surface of a substrate using a
laser process based on bionics.
[0203] In step S153, a parameter is regulated. A spraying process
parameter and a parameter of the textured patterns are regulated
based on the textured patterns formed in step S152, to obtain
textured patterns formed by alternately combining the channel
shapes and the circles. In the textured patterns, a distance
between the channel shape and the circle adjacent to the channel
shape is 60 .mu.m, a width of the channel shape is 15 .mu.m, and a
diameter of the circle is 15 .mu.m. Alternatively, a distance
between the channel shape and the circle adjacent to the channel
shape is 60 .mu.m, a width of the channel shape is 25 .mu.m, and a
diameter of the circle is 25 .mu.m. Alternatively, a distance
between the channel shape and the circle adjacent to the channel
shape is 60 .mu.m, a width of the channel shape is 40 .mu.m, and a
diameter of the circle is 40 .mu.m. Alternatively, a distance
between the channel shape and the circle adjacent to the channel
shape is 60 .mu.m, a width of the channel shape is 60 .mu.m, and a
diameter of the circle is 60 .mu.m.
[0204] For the textured patterns with the shape parameters, a laser
power is 15 W, a scanning speed is 900 mm/s, and the number of
processing is 2. The textured patterns are textured by the
following steps: texturing at least three columns of circular
patterns, where a preset distance is reserved between each pair of
adjacent columns of circular patterns, and the preset distance is
greater than a width of a channel shape to be textured; and
texturing channel-shaped patterns between each pair of adjacent
columns of circular patterns.
Comparative Example
[0205] The tensile test is performed on the textured patterns
formed by alternately combining the circles and the channel shapes
with different dimensions prepared in the above embodiment, and on
a circular textured pattern and a channel-shaped textured pattern
after a coating is sprayed on the respective textured patterns. The
adhesion strength is indicated by a ratio of a force under which
the coating fractures from the substrate to the area of the
coating.
[0206] The testing results are as shown in FIG. 21 and FIG. 22.
FIG. 21 is a curve diagram showing comparison of adhesion strength
for the combination-shaped textured pattern, the only-circular
pattern and the only-channel-shaped pattern. FIG. 22 shows adhesion
strength between the coating and the substrate for the
combination-shaped textured patterns formed by alternately
combining the circles and the channel shapes with different
dimensions. Comparison of adhesion strength for the
combination-shaped textured patterns with different dimensions is
as shown in the following Table.
TABLE-US-00007 TABLE 7 Comparison of Adhesion strength for
Combination-shaped Textured Patterns with Different Dimensions
Width of a channel shape 15 .mu.m 25 .mu.m 40 .mu.m 60 .mu.m
Diameter of a circle 15 .mu.m 25 .mu.m 40 .mu.m 60 .mu.m Adhesion
strength 28 MPa 35 MPa 48 MPa 56 MPa
[0207] In a case that the textured patterns are formed by
alternately combining the circles and the channel shapes, the
adhesion strength is affected by both a width of the channel shape
and a diameter of the circle. Taking the above Table as an example,
the adhesion strength is at a minimum value 28 MPa in a case that
the width of the channel shape is 15 .mu.m and the diameter of the
circle is 15 .mu.m. The adhesion strength is at a maximum value 56
MPa in a case that the width of the channel shape is 60 .mu.m and
the diameter of the circle is 60 .mu.m. The adhesion strength is 35
MPa in a case that the width of the channel shape is 25 .mu.m and
the diameter of the circle is 25 .mu.m. The adhesion strength is 48
MPa in a case that the width of the channel shape is 40 .mu.m and
the diameter of the circle is 40 .mu.m. It can be seen that the
adhesion strength increases with an increase in the width of the
channel shape and an increase in the diameter of the circle in a
case that the width of the channel shape ranges from 15 .mu.m to 60
.mu.m and the diameter of the circle ranges from 15 .mu.m to 60
.mu.m.
[0208] As compared with the single-shaped textured pattern, the
alternate-combination-shaped textured pattern has higher adhesion
strength. Comparison of adhesion strength for the
only-channel-shaped textured pattern, the only-circular textured
pattern, and the combination-shaped textured pattern formed by
alternately combining the circles with the same dimension as the
only-circular textured pattern and the channel shapes with the same
dimension as the only-channel-shaped textured pattern is as shown
in the following Table.
TABLE-US-00008 TABLE 8 Comparison of Adhesion strength for
Single-Shaped Pattern and Combination-shaped Pattern with the same
Dimension Adhesion strength of an only-channel-shaped pattern with
a 36 MPa width of 40 .mu.m Adhesion strength of an only-circular
pattern with a 40 MPa diameter of 40 .mu.m Adhesion strength of a
combination-shaped pattern of channel 48 MPa shapes with a width of
40 .mu.m and circles with a diameter of 40 .mu.m
[0209] In the method provided in the present disclosure, the
adhesion strength of the sprayed coating is changed by changing a
combination manner of the textured patterns. For the textured
patterns in an only channel shape, an only circle shape, and a
shape of alternating the channel shape and the circle shape, the
respective adhesion strengths of the sprayed coating are different.
As compared with the existing texturing method for improving
strength of the coating, the parameter of the textured patterns is
optimized. In the present disclosure, a laser texturing method is
used for controlling a parameter of a laser process, to obtain
textured geometrical patterns with dimensions arranged regularly at
a density on the surface of the substrate. As a processing before
spraying, the textured patterns formed by alternately combining the
channel shapes and the circles are prearranged on a surface of a
material. As compared with the only-channel-shaped textured pattern
and the only-circular textured pattern, a problem in the
single-shaped patterns that stress is centralized in a certain
direction and positions of adhesion weak points are uniform can be
solved with the combination-shaped pattern. That is, in the
only-channel-shaped textured patterns, weak points of the channel
shapes are located at the same or similar positions of the
channels, which results in easily cracking of the whole coating in
a certain direction. In the combination-shaped patterns, a weak
point of the channel-shaped textured pattern and a weak point of
the circular textured pattern are located at different positions of
the respective patterns. Therefore, the channel-shaped textured
pattern and the circular textured pattern can complement with each
other in a case that the channel-shaped textured pattern and the
circular textured pattern are combined together, thereby improving
the overall adhesion strength. A mechanism in which the strength of
the sprayed coating is improved by combining the channel-shaped
textured pattern and the circular textured pattern is researched by
changing a characteristic of the single type of the traditional
textured pattern, and an optimal parameter of the textured patterns
for effectively improving adhesion strength of the coating is
further researched. Therefore, the bonding force between the
coating and the substrate is improved, so that the sprayed coating
can be applied into the engineering practices with a long service
life.
[0210] A structure for improving adhesion strength of a coating is
further provided according to the embodiment of the present
disclosure, which includes a substrate, textured patterns prepared
on the substrate, and a coating sprayed on the textured patterns.
The textured patterns include multiple columns of channel-shaped
patterns and multiple columns of circular patterns. The
channel-shaped pattern and the circular pattern are arranged
alternately, and one column of circular patterns is arranged
between each pair of adjacent columns of channel-shaped patterns. A
distance between the channel shape and the circle adjacent to the
channel shape in the textured patterns is 60 .mu.m. A width of the
channel shape is at least one of 15 .mu.m, 25 .mu.m, 40 .mu.m or 60
.mu.m. A diameter of the circle is at least one of 15 .mu.m, 25
.mu.m, 40 .mu.m or 60 .mu.m. The substrate is made of stainless
steel, and furthermore is made of FV520B, and the coating is a
NiCrBSi ceramic coating.
Sixteenth Embodiment
[0211] A method for improving adhesion strength of a coating is
provided in the present embodiment, in which, a side length of a
regular hexagon and a side length of a square in textured patterns
formed by alternately combining regular hexagons and squares are
regulated to improve the adhesion strength of the coating. The
method includes the following steps S162 and S163 in addition to
the same steps as the above embodiments.
[0212] In step S162, textured patterns are prepared.
Combination-shaped patterns formed by combining regular hexagons
and squares are textured on a surface of a substrate using a laser
process based on bionics.
[0213] In step S163, a parameter is regulated. A spraying process
parameter and a parameter of the textured patterns are regulated
based on the textured patterns formed in step S162, to obtain
textured patterns formed by alternately combining the regular
hexagons and the squares. In the textured patterns, a distance
between the regular hexagon and the square adjacent to the regular
hexagon is 60 .mu.m, a side length of the regular hexagon is 20
.mu.m, and a side length of the square is 20 .mu.m. Alternatively,
a distance between the regular hexagon and the square adjacent to
the regular hexagon is 60 .mu.m, a side length of the regular
hexagon is 30 .mu.m, and a side length of the square is 30 .mu.m.
Alternatively, a distance between the regular hexagon and the
square adjacent to the regular hexagon is 60 .mu.m, a side length
of the regular hexagon is 45 .mu.m, and a side length of the square
is 45 .mu.m. Alternatively, a distance between the regular hexagon
and the square adjacent to the regular hexagon is 60 .mu.m, a side
length of the regular hexagon is 60 .mu.m, and a side length of the
square is 60 .mu.m.
[0214] For the textured patterns with the shape parameters, a laser
power is 14 W, a scanning speed is 800 mm/s, and the number of
processing is 2. The textured patterns are textured by: texturing
at least three columns of square patterns, where a preset distance
is reserved between each pair of adjacent columns of square
patterns, and the preset distance is greater than a length of the
longest diagonal line of a regular hexagon to be textured; and
texturing one column of regular-hexagonal patterns between each
pair of adjacent columns of square patterns.
Comparative Example
[0215] The tensile test is performed on the textured patterns
formed by alternately combining the squares and the regular
hexagons with different dimensions prepared in the above
embodiment, and on an only-square pattern and an
only-regular-hexagonal pattern after a coating is sprayed on the
respective patterns. The adhesion strength is indicated by a ratio
of a force under which the coating fractures from the substrate to
the area of the coating.
[0216] The testing results are as shown in FIG. 23 and FIG. 24.
FIG. 23 is a curve diagram showing comparison of adhesion strength
for the combination-shaped textured pattern, the only-square
pattern and the only-regular-hexagonal pattern. FIG. 24 shows
adhesion strength between the coating and the substrate for the
combination-shaped textured patterns formed by alternately
combining the squares and the regular hexagons with different
dimensions. Comparison of adhesion strength for the
combination-shaped textured patterns with different dimensions is
as shown in the following Table.
TABLE-US-00009 TABLE 9 Comparison of Adhesion strength of
Combination-shaped Textured Patterns with Different Dimensions Side
length of a regular hexagon 20 .mu.m 30 .mu.m 45 .mu.m 60 .mu.m
Side length of a square 20 .mu.m 30 .mu.m 45 .mu.m 60 .mu.m
Adhesion strength 38 MPa 46 MPa 55 MPa 68 MPa
[0217] In a case that the textured patterns are formed by
alternately combining the squares and the regular hexagon, the
adhesion strength is affected by both the side length of the square
and the side length of the regular hexagon. Taking the above Table
as an example, the adhesion strength is at a minimum value 38 MPa
in a case that the side length of the regular hexagon is 20 .mu.m
and the side length of the square is 20 .mu.m. The adhesion
strength is at a maximum value 68 MPa in a case that the side
length of the regular hexagon is 60 .mu.m and the side length of
the square is 60 .mu.m. The adhesion strength is 46 MPa in a case
that the side length of the regular hexagon is 30 .mu.m and the
side length of the square is 30 .mu.m. The adhesion strength is 55
MPa in a case that the side length of the regular hexagon is 45
.mu.m and the side length of the square is 45 .mu.m. It can be seen
that the adhesion strength increases with an increase in the side
length of the regular hexagon and an increase in the side length of
the square in a case that the side length of the regular hexagon
ranges from 20 .mu.m to 60 .mu.m and the side length of the square
ranges from 20 .mu.m to 60 .mu.m.
[0218] As compared with the single-shaped textured pattern, the
alternate-combination-shaped textured pattern has higher adhesion
strength. Comparison of adhesion strength for the
only-regular-hexagonal textured pattern, the only-square textured
pattern, and the combination-shaped textured pattern formed by
alternately combining the squares with the same dimension as the
only-square textured pattern and the regular hexagons with the same
dimension as the only-regular-hexagonal textured pattern is as
shown in the following Table.
TABLE-US-00010 TABLE 10 Comparison of Adhesion strength for
Single-Shaped Pattern and Combination-shaped Pattern with the same
Dimension Adhesion strength of an only-regular-hexagonal pattern 48
MPa with a side length of 45 .mu.m Adhesion strength of an
only-square pattern with a side 46 MPa length of 45 .mu.m Adhesion
strength of a combination-shaped pattern of regular 55 MPa hexagons
with a side length of 45 .mu.m and squares with a side length of 45
.mu.m
[0219] In the method provided in the present disclosure, the
adhesion strength of the sprayed coating is changed by changing a
combination manner of the textured patterns. For the textured
patterns in an only regular hexagon shape, an only square shape,
and a shape of alternating the regular hexagons and the squares,
the respective adhesion strengths of the sprayed coating are
different. As compared with the existing texturing method for
improving strength of the coating, the parameter of the textured
patterns is optimized. In the present disclosure, a laser texturing
method is used for controlling a parameter of a laser process, to
obtain textured geometrical patterns with dimensions arranged
regularly at a density on the surface of the substrate. As a
processing before spraying, the textured patterns formed by
alternately combining the regular hexagons and the squares are
prearranged on a surface of a material. As compared with the
only-regular-hexagonal textured pattern and the only-square
textured pattern, a problem in the single-shaped patterns that
stress is centralized in a certain direction and positions of
adhesion weak points are uniform can be solved with the
combination-shaped pattern. That is, in the only-regular-hexagonal
textured patterns, weak points of the regular hexagons are located
at the same or similar positions of the regular hexagons, which
results in easily cracking of the whole coating in a certain
direction. In the combination-shaped patterns, a weak point of the
regular-hexagonal textured pattern and a weak point of the square
textured pattern are located at different positions of the
respective patterns. Therefore, the regular-hexagonal textured
pattern and the square textured pattern can complement with each
other in a case that the regular-hexagonal textured pattern and the
square textured pattern are combined together, thereby improving
the overall adhesion strength. A mechanism in which the strength of
the sprayed coating is improved by combining the regular-hexagonal
textured patterns and the square textured patterns is researched by
changing a characteristic of the single type of the traditional
textured pattern, and an optimal parameter of the textured patterns
for effectively improving adhesion strength of the coating is
further researched. Therefore, the bonding force between the
coating and the substrate is improved, so that the sprayed coating
can be applied into the engineering practices with a long service
life.
[0220] A structure for improving adhesion strength of a coating is
further provided according to the embodiment of the present
disclosure, which includes a substrate, textured patterns prepared
on the substrate, and a coating sprayed on the textured patterns.
The textured patterns include multiple columns of regular-hexagonal
patterns and multiple columns of square patterns. The
regular-hexagonal pattern and the square pattern are arranged
alternately, and one column of square patterns is arranged between
each pair of adjacent columns of regular-hexagonal patterns. A
distance between the regular-hexagon and the square adjacent to the
regular-hexagon in the textured patterns is 60 .mu.m. A side length
of the regular hexagon is at least one of 20 .mu.m, 30 .mu.m, 45
.mu.m or 60 .mu.m. A side length of the square is at least one of
15 .mu.m, 30 .mu.m, 45 .mu.m or 60 .mu.m. The substrate is made of
stainless steel, and furthermore is made of FV520B, and the coating
is a NiCrBSi ceramic coating.
Seventeenth Embodiment
[0221] A method for improving adhesion strength of a coating is
provided in the present embodiment, in which, a side length of a
regular-hexagonal pattern and a diameter of a circular pattern in
textured patterns formed by alternately combining regular hexagons
and circles are regulated to improve adhesion strength of the
coating. The method includes the following steps S172 and S173 in
addition to the same steps as the above embodiments.
[0222] In step S172, textured patterns are prepared.
Combination-shaped patterns formed by alternately combining regular
hexagons and circles are textured on a surface of a substrate using
a laser process based on bionics.
[0223] In step S173, a parameter is regulated. A spraying process
parameter and a parameter of the textured patterns are regulated
based on the textured patterns formed in step S172, to obtain
textured patterns formed by alternately combining the regular
hexagons and the circles. In the textured patterns, a distance
between the regular hexagon and the circle adjacent to the regular
hexagon is 60 .mu.m, a side length of the regular hexagon is 20
.mu.m, and a diameter of the circle is 15 .mu.m. Alternatively, a
distance between the regular hexagon and the circle adjacent to the
regular hexagon is 60 .mu.m, a side length of the regular hexagon
is 35 .mu.m, and a diameter of the circle is 25 .mu.m.
Alternatively, a distance between the regular hexagon and the
circle adjacent to the regular hexagon is 60 .mu.m, a side length
of the regular hexagon is 55 .mu.m, and a diameter of the circle is
40 .mu.m. Alternatively, a distance between the regular hexagon and
the circle adjacent to the regular hexagon is 60 .mu.m, a side
length of the regular hexagon is 70 .mu.m, and a diameter of the
circle is 60 .mu.m.
[0224] For the textured patterns with the shape parameters, a laser
power is 15 W, a scanning speed is 900 mm/s, and the number of
processing is 2. The textured patterns are textured by: texturing
at least three columns of circular patterns, where a preset
distance is reserved between each pair of adjacent columns of
circular patterns, and the preset distance is greater than a length
of the longest diagonal line of the regular hexagon to be textured;
and texturing regular-hexagonal patterns between each pair of
adjacent columns of circular patterns.
Comparative Example
[0225] The tensile test is performed on the combination-shaped
textured patterns formed by alternately combining the circles and
the regular hexagons with different dimensions prepared in the
above embodiment, and on an only-circular pattern and an
only-regular-hexagonal pattern after a coating is sprayed on the
respective textured patterns. The adhesion strength is indicated by
a ratio of a force under which the coating fractures from the
substrate to the area of the coating.
[0226] The testing results are as shown in FIG. 25 and FIG. 26.
FIG. 25 is a curve diagram showing comparison of adhesion strength
for the combination-shaped textured pattern, the only-circular
pattern and the only-regular-hexagonal pattern. FIG. 26 shows
adhesion strength between the coating and the substrate for the
combination-shaped textured patterns formed by alternately
combining the circles and the regular hexagons with different
dimensions. Comparison of adhesion strength for the
combination-shaped textured patterns with different dimensions is
as shown in the following Table.
TABLE-US-00011 TABLE 11 Comparison of Adhesion strength for
Combination-shaped Textured Patterns with Different Dimensions Side
length of a regular hexagon 20 .mu.m 35 .mu.m 55 .mu.m 70 .mu.m
Diameter of a circle 15 .mu.m 25 .mu.m 40 .mu.m 60 .mu.m Adhesion
strength 35 MPa 43 MPa 56 MPa 64 MPa
[0227] In a case that the textured patterns are formed by combining
the circles and the regular hexagons, the adhesion strength is
affected by both the side length of the regular hexagon and the
diameter of the circle. Taking the above Table as an example, the
adhesion strength is at a minimum value 35 MPa in a case that the
side length of the regular hexagon is 20 .mu.m and the diameter of
the circle is 15 .mu.m. The adhesion strength is at a maximum value
64 MPa in a case that the side length of the regular hexagon is 70
.mu.m and the diameter of the circle is 60 .mu.m. The adhesion
strength is 43 MPa in a case that the side length of the regular
hexagon is 35 .mu.m and the diameter of the circle is 25 .mu.m. The
adhesion strength is 56 MPa in a case that the side length of the
regular hexagon is 55 .mu.m and the diameter of the circle is 40
.mu.m. It can be seen that the adhesion strength increases with an
increase in the side length of the regular hexagon and an increase
in the diameter of the circle in a case that the side length of the
regular hexagon ranges from 20 .mu.m to 70 .mu.m and the diameter
of the circle ranges from 15 .mu.m to 60 .mu.m.
[0228] As compared with the single-shaped textured pattern, the
alternate-combination-shaped textured pattern has higher adhesion
strength. Comparison of adhesion strength for the
only-regular-hexagonal textured pattern, the only-circular textured
pattern and the combination-shaped textured pattern formed by
alternately combing the circles with the same dimension as the
only-circular textured pattern and the regular hexagons with the
same dimension as the only-regular-hexagonal textured pattern is as
shown in the following Table.
TABLE-US-00012 TABLE 12 Comparison of Adhesion strength for
Single-Shaped Pattern and Combination-shaped Pattern with the same
Dimension Adhesion strength of an only-regular-hexagonal pattern
with 52 MPa a side length of 55 .mu.m Adhesion strength of an
only-circular pattern with a 40 MPa diameter of 40 .mu.m Adhesion
strength of a combination-shaped pattern of regular 56 MPa hexagons
with a side length of 55 .mu.m and circles with a diameter of 40
.mu.m
[0229] In the method provided in the present disclosure, the
adhesion strength of the sprayed coating is changed by changing a
combination manner of the textured patterns. For the textured
patterns in an only regular hexagon shape, an only circle shape and
a shape of alternating the regular hexagons and the circles, the
respective adhesion strengths of the sprayed coating are different.
As compared with the existing texturing method for improving
strength of the coating, the parameter of the textured patterns is
optimized. In the present disclosure, a laser texturing method is
used for controlling a parameter of the laser process, to obtain
textured geometrical patterns with dimensions and arranged
regularly at a density on the surface of the substrate. As a
processing before spraying, the textured patterns formed by
alternately combining the regular hexagons and the circles are
prearranged on a surface of a material. As compared with the
only-regular-hexagonal textured pattern and the only-circular
textured pattern, a problem in the single-shaped patterns that
stress is centralized in a certain direction and positions of
adhesion weak points are uniform can be solved with the
combination-shaped patterns. That is, in the only-regular-hexagonal
textured patterns, the weak points in the regular hexagons are
located at the same or similar positions of the regular hexagons,
which results in easily cracking of the whole coating in a certain
direction. In the combination-shaped patterns, a weak point in the
regular-hexagonal textured pattern and a weak point of the circular
textured pattern are located at different positions of the
respective patterns. Therefore, the regular-hexagonal textured
pattern and the circular textured pattern can complement with each
other in a case that the regular-hexagonal textured pattern and the
circular textured pattern are combined together, thereby improving
the overall adhesion strength. A mechanism in which the strength of
the sprayed coating is improved by combining the regular-hexagonal
textured pattern and the circular textured pattern is researched by
changing a characteristic of the single type of the traditional
textured pattern, and an optimal parameter of the textured patterns
for effectively improving adhesion strength of the coating is
further researched. Therefore, the bonding force between the
coating and the substrate is improved, so that the sprayed coating
can be applied into the engineering practices with a long service
life.
[0230] A structure for improving adhesion strength of a coating is
further provided according to the embodiment of the present
disclosure, which includes a substrate, textured patterns prepared
on the substrate, and a coating sprayed on the textured patterns.
The textured patterns include multiple columns of regular-hexagonal
patterns and multiple columns of circular patterns. The
regular-hexagonal pattern and the circular pattern are arranged
alternately. One column of circular patterns is arranged between
each pair of adjacent columns of regular-hexagonal patterns, and
one column of regular-hexagonal patterns is arranged between each
pair of adjacent columns of circular patterns. A distance between
the regular hexagon and the circle adjacent to the regular hexagon
in the textured patterns is 60 .mu.m. A side length of the regular
hexagon is at least one of 20 .mu.m, 35 .mu.m, 55 .mu.m or 70
.mu.m. A diameter of the circle is at least one of 15 .mu.m, 25
.mu.m, 40 .mu.m or 60 .mu.m. The substrate is made of stainless
steel, and furthermore is made of FV520B, and the coating is a
NiCrBSi ceramic coating.
Eighteenth Embodiment
[0231] A method for improving adhesion strength of a coating is
provided in the present embodiment, in which, a side length of a
square and a diameter of a circle in textured patterns formed by
alternately combining squares and circles are regulated to improve
the adhesion strength of the coating. The method includes the
following steps S182 and S183 in addition to the same steps as the
above embodiments.
[0232] In step S182, textured patterns are prepared.
Combination-shaped patterns formed by alternately combining squares
and circles are textured on a surface of a substrate using a laser
process based on bionics.
[0233] In step S183, a parameter is regulated. A spraying process
parameter and a parameter of the textured patterns are regulated
based on the textured patterns formed in step S182, to obtain
textured patterns formed by alternately combining the squares and
the circles. In the textured patterns, a distance between the
square and the circle adjacent to the square is 60 .mu.m, a side
length of the square is 20 .mu.m, and a diameter of the circle is
15 .mu.m. Alternatively, a distance between the square and the
circle adjacent to the square is 60 .mu.m, a side length of the
regular hexagon is 35 .mu.m, and a diameter of the circle is 25
.mu.m. Alternatively, a distance between the square and the circle
adjacent to the square is 60 .mu.m, a side length of the square is
55 .mu.m, and a diameter of the circle is 40 .mu.m. Alternatively,
a distance between the square and the circle adjacent to the square
is 60 .mu.m, a side length of the square is 70 .mu.m, and a
diameter of the circle is 60 .mu.m.
[0234] For the textured patterns with the shape parameters, a laser
power is 15 W, a scanning speed is 900 mm/s, and the number of
processing is 2. The textured patterns are textured by: texturing
at least three columns of circular patterns, where a preset
distance is reserved between each pair of adjacent columns of
circular patterns, and the preset distance is greater than a side
length of the square to be textured; and texturing square patterns
between each pair of adjacent columns of circular patterns.
Comparative Example
[0235] The tensile test is performed on the textured patterns
formed by alternately combining the circles and the squares with
different dimensions prepared in the above embodiment, and on an
only-circular pattern and an only-square pattern after a coating is
sprayed on the respective patterns. The adhesion strength is
indicated by a ratio of a force under which the coating fractures
from the substrate to the area of the coating.
[0236] The testing results are as shown in FIG. 27 and FIG. 28.
FIG. 27 is a curve diagram showing comparison of adhesion strength
for the combination-shaped textured pattern, the only-circular
pattern and the only-square pattern. FIG. 28 shows adhesion
strength between the coating and the substrate for the
combination-shaped textured patterns formed by alternately
combining the circles and the squares with different dimensions.
Comparison of adhesion strength for the combination-shaped textured
patterns with different dimensions is as shown in the following
Table.
TABLE-US-00013 TABLE 13 Comparison of Adhesion strength for
Combination-shaped Textured Patterns with Different Dimensions Side
length of a square 20 .mu.m 35 .mu.m 55 .mu.m 70 .mu.m Diameter of
a circle 15 .mu.m 25 .mu.m 40 .mu.m 60 .mu.m Adhesion strength 30
MPa 39 MPa 52 MPa 62 MPa
[0237] In a case that the textured patterns are formed by combining
the circles and the squares, the adhesion strength is affected by
both the side length of the square and the diameter of the circle.
Taking the above Table as an example, the adhesion strength is at a
minimum value 30 MPa in a case that the side length of the square
is 20 .mu.m and the diameter of the circle is 15 .mu.m. The
adhesion strength is at a maximum value 62 MPa in a case that the
side length of the square is 70 .mu.m and the diameter of the
circle is 60 .mu.m. The adhesion strength is 39 MPa in a case that
the side length of the square is 35 .mu.m and the diameter of the
circle is 25 .mu.m. The adhesion strength is 52 MPa in a case that
the side length of the square is 55 .mu.m and the diameter of the
circle is 40 .mu.m. It can be seen that the adhesion strength
increases with an increase in the side length of the square and an
increase in the diameter of the circle in a case that the side
length of the square ranges from 20 .mu.m to 70 .mu.m and the
diameter of the circle ranges from 15 .mu.m to 60 .mu.m.
[0238] As compared with the single-shaped textured patterns, the
alternate-combination-shaped textured pattern has higher adhesion
strength. Comparison of adhesion strength for the only-square
textured pattern, the only-circular textured pattern and the
combination-shaped textured pattern formed by alternately combing
the circles with the same dimension as the only-circular textured
pattern and the squares with the same dimension as the only-square
textured pattern is as shown in the following Table.
TABLE-US-00014 TABLE 14 Comparison of Adhesion strength for
Single-Shaped Pattern and Combination-shaped Pattern with the same
Dimension Adhesion strength of an only-square pattern with a 47 MPa
side length of 55 .mu.m Adhesion strength of an only-circular
pattern with a 40 MPa diameter of 40 .mu.m Adhesion strength of a
combination-shaped pattern of 52 MPa squares with a side length of
55 .mu.m and circles with a diameter of 40 .mu.m
[0239] In the method provided in the present disclosure, the
adhesion strength of the sprayed coating is changed by changing a
combination manner of the textured patterns. For the textured
patterns in three combination manners including an only square
shape, an only circle shape and a shape of alternating the squares
and the circles, the respective adhesion strengths of the sprayed
coating are different. As compared with the existing texturing
method for improving strength of the coating, the parameter of the
textured patterns is optimized. In the present disclosure, a laser
texturing method is used for controlling a parameter of the laser
process, to obtain textured geometrical patterns with dimensions
arranged regularly at a density on the surface of the substrate. As
a processing before spraying, the textured patterns formed by
alternately combining the squares and the circles are prearranged
on a surface of a material. As compared with the only-square
textured pattern and the only-circular textured pattern, a problem
in the single-shaped patterns that stress is centralized in a
certain direction and positions of adhesion weak points are uniform
can be solved with the combination-shaped pattern. That is, in the
only-square textured patterns, weak points of the squares are
located at the same or similar positions of the squares, which
results in easily cracking of the whole coating in a certain
direction. In the combination-shaped patterns, a weak point of the
square textured pattern and a weak point of the circular textured
pattern are located at different positions of the respective
patterns. Therefore, the square textured pattern and the circular
textured pattern can complement with each other in a case that the
square textured pattern and the circular textured pattern are
combined together, thereby improving the overall adhesion strength.
A mechanism in which the strength of the sprayed coating is
improved by combining the square pattern and the circular textured
pattern is researched by changing a characteristic of the single
type of the traditional textured pattern, and an optimal parameter
of the textured patterns for effectively improving adhesion
strength of the coating is further researched. Therefore, the
bonding force between the coating and the substrate is improved, so
that the sprayed coating can be applied into the engineering
practices with a long service life.
[0240] A structure for improving adhesion strength of a coating is
further provided according to the embodiment of the present
disclosure, which includes a substrate, textured patterns prepared
on the substrate, and a coating sprayed on the textured patterns.
The textured patterns include multiple columns of square patterns
and multiple columns of circular patterns. The square patterns and
the circular patterns are arranged alternately. One column of
circular patterns is arranged between each pair of adjacent columns
of square patterns. A distance between the square and the circle
adjacent to the square in the textured patterns is 60 .mu.m. A side
length of the square is at least one of 20 .mu.m, 35 .mu.m, 55
.mu.m or 70 .mu.m. A diameter of the circle is at least one of 15
.mu.m, 25 .mu.m, 40 .mu.m or 60 .mu.m. The substrate is made of
stainless steel, and furthermore is made of FV520B, and the coating
is a NiCrBSi ceramic coating.
Nineteenth Embodiment
[0241] A method for improving adhesion strength of a coating is
provided in the present embodiment, in which, a side length of a
square pattern and a width of a channel shape in textured patterns
formed by alternately combining squares and channel shapes are
regulated to improve adhesion strength of the coating. The method
includes the following steps S192 and S193 in addition to the same
steps as the above embodiments.
[0242] In step S192, textured patterns are prepared.
Combination-shaped patterns formed by combining squares and channel
shapes are textured on a surface of a substrate using a laser
process based on bionics.
[0243] In step S193, a parameter is regulated. A spraying process
parameter and a parameter of the textured patterns are regulated
based on the textured patterns formed in step S192, to obtain
textured patterns formed by alternately combining the squares and
the channel shapes. In the textured patterns, a distance between
the square and the channel shape adjacent to the square is 65
.mu.m, a side length of the square is 20 .mu.m, and a width of the
channel shape is 15 .mu.m. Alternatively, a distance between the
square and the channel shape adjacent to the square is 65 .mu.m, a
side length of the square is 35 .mu.m, and a width of the channel
shape is 25 .mu.m. Alternatively, a distance between the square and
the channel shape adjacent to the square is 65 .mu.m, a side length
of the square is 55 .mu.m, and a width of the channel shape is 40
.mu.m. Alternatively, a distance between the square and the channel
shape adjacent to the square is 65 .mu.m, a side length of the
square is 70 .mu.m, and a width of the channel shape is 60
.mu.m.
[0244] For the textured patterns with the shape parameters, a laser
powers is 14 W, a scanning speed is 800 mm/s, and the number of
processing is 2. The textured patterns are textured by: texturing
at least three columns of channel-shaped patterns, where a preset
distance is reserved between each pair of adjacent columns of
channel-shaped patterns, and the preset distance is greater than a
side length of the square to be textured; and texturing one column
of square patterns between each pair of adjacent columns of
channel-shaped patterns.
Comparative Example
[0245] The tensile test is performed on the combination-shaped
textured patterns formed by alternately combining the channel
shapes and the squares with different dimensions prepared in the
above embodiment, and on an only-channel-shaped pattern and an
only-square pattern after a coating is sprayed on the respective
textured patterns. The adhesion strength is indicated by a ratio of
a force under which the coating fractures from the substrate to the
area of the coating.
[0246] The testing results are as shown in FIG. 29 and FIG. 30.
FIG. 29 is a curve diagram showing comparison of adhesion strength
for the combination-shaped textured pattern, the
only-channel-shaped pattern and the only-square pattern. FIG. 30
shows adhesion strength between the coating and the substrate for
the combination-shaped textured patterns with different dimensions
formed by alternately combining the channel shapes and the circles.
Comparison of adhesion strength for the combination-shaped textured
patterns with different dimensions is as shown in the following
Table.
TABLE-US-00015 TABLE 15 Comparison of Adhesion strength for
Combination-shaped Textured Patterns with Different Dimensions Side
length of a square 20 .mu.m 35 .mu.m 55 .mu.m 70 .mu.m Width of a
channel shape 15 .mu.m 25 .mu.m 40 .mu.m 60 .mu.m Adhesion strength
26 MPa 32 MPa 48 MPa 56 MPa
[0247] In a case that the textured patterns are formed by
alternately combining the channel shapes and the squares, the
adhesion strength is affected by both the side length of the square
and the width of the channel shape. Taking the above Table as an
example, the adhesion strength is at a minimum value 26 MPa in a
case that the side length of the square is 20 .mu.m and the width
of the channel shape is 15 .mu.m. The adhesion strength is at a
maximum value 56 MPa in a case that the side length of the square
is 70 .mu.m and the width of the channel shape is 60 .mu.m. The
adhesion strength is 32 MPa in a case that the side length of the
square is 35 .mu.m and the width of the channel shape is 25 .mu.m.
The adhesion strength is 48 MPa in a case that the side length of
the square is 55 .mu.m and the width of the channel shape is 40
.mu.m. It can be seen that the adhesion strength increases with an
increase in the side length of the square and an increase in the
width of the channel shape in a case that the side length of the
square ranges from 20 .mu.m to 70 .mu.m and the width of the
channel shape ranges from 15 .mu.m to 60 .mu.m.
[0248] As compared with the single-shaped textured pattern, the
alternate-combination-shaped textured pattern has higher adhesion
strength. Comparison of adhesion strength for the only-square
textured pattern, the only-channel-shaped textured pattern and the
combination-shaped textured pattern formed by alternately combining
the channel shapes with the same dimension as the
only-channel-shaped textured pattern and the squares with the same
dimension as the only-square textured pattern is as shown in the
following Table.
TABLE-US-00016 TABLE 16 Comparison of Adhesion strength for
Single-Shaped Pattern and Combination-shaped Pattern with the same
Dimension Adhesion strength of an only-square pattern with a side
47 MPa length of 55 .mu.m Adhesion strength of an
only-channel-shaped pattern with 36 MPa a width of 40 .mu.m
Adhesion strength of a combination-shaped pattern of squares 48 MPa
with a side length of 55 .mu.m and channel shapes with a width of
40 .mu.m
[0249] In the method provided in the present disclosure, the
adhesion strength of the sprayed coating is changed by changing a
combination manner of the textured patterns. For the textured
patterns in an only square shape, an only channel shape or a shape
of alternating the squares and the channel shapes, the respective
adhesion strength of the sprayed coating are different. As compared
with the existing texturing method for improving strength of the
coating, the parameter of the textured patterns is optimized. In
the present disclosure, a laser texturing method is used for
controlling a parameter of the laser process, to obtain textured
geometrical patterns with dimensions and arranged regularly at a
density on the surface of the substrate. As a processing before
spraying, the textured patterns formed by alternately combining the
squares and the channel shapes are prearranged on a surface of a
material. As compared with the only-square textured pattern and the
only-channel-shaped textured pattern, a problem in the
single-shaped patterns that stress is centralized in a certain
direction and positions of adhesion weak points are uniform can be
solved with the combination-shaped patterns. That is, in the
only-square textured patterns, the weak points in the squares are
located at the same or similar positions of the squares, which
results in easily cracking of the whole coating in a certain
direction. In the combination-shaped patterns, a weak point in the
square textured pattern and a weak point of the channel-shaped
textured pattern are located at different positions of the
respective textured patterns. Therefore, the square textured
pattern and the channel-shaped textured pattern can complement with
each other in a case that the square textured pattern and the
channel-shaped textured pattern are combined together, thereby
improving the overall adhesion strength. A mechanism in which the
strength of the sprayed coating is improved by combining the square
textured pattern and the channel-shaped textured pattern is
researched by changing a characteristic of the single type of the
traditional textured pattern, and an optimal parameter of the
textured patterns for effectively improving adhesion strength of
the coating is further researched. Therefore, the bonding force
between the coating and the substrate is improved, so that the
sprayed coating can be applied into the engineering practices with
a long service life.
[0250] A structure for improving adhesion strength of a coating is
further provided according to the embodiment of the present
disclosure, which includes a substrate, textured patterns prepared
on the substrate, and a coating sprayed on the textured patterns.
The textured patterns include multiple columns of square patterns
and multiple columns of channel-shaped patterns. The square pattern
and the channel-shaped pattern are arranged alternately. One column
of channel-shaped patterns is arranged between each pair of
adjacent columns of square patterns. A distance between the square
and the channel shape adjacent to the square in the textured
patterns is 65 .mu.m. A side length of the square is at least one
of 20 .mu.m, 35 .mu.m, 55 .mu.m or 70 .mu.m. A width of the channel
shape is at least one of 15 .mu.m, 25 .mu.m, 40 .mu.m or 60 .mu.m.
The substrate is made of stainless steel, and furthermore is made
of FV520B, and the coating is a NiCrBSi ceramic coating.
Twentieth Embodiment
[0251] A method for improving adhesion strength of a coating is
provided in the present embodiment, in which, a side length of a
regular hexagon and a width of a channel shape in textured patterns
formed by alternately combining regular hexagons and channel shapes
are regulated to improve the adhesion strength of the coating. The
method includes the following steps S202 and S203 in addition to
the same steps as the above embodiments.
[0252] In step S202, textured patterns are prepared.
Combination-shaped patterns formed by combining regular hexagons
and channel shapes are textured on a surface of a substrate using a
laser process based on bionics.
[0253] In step S203, a parameter is regulated. A spraying process
parameter and a parameter of the textured patterns are regulated
based on the textured patterns formed in step S202, to obtain
textured patterns formed by alternately combining the regular
hexagons and the channel shapes. In the textured patterns, a
distance between the regular hexagon and the channel shape adjacent
to the regular hexagon is 60 .mu.m, a side length of the regular
hexagon is 20 .mu.m, and a width of the channel shape is 15 .mu.m.
Alternatively, a distance between the regular hexagon and the
channel shape adjacent to the regular hexagon is 60 .mu.m, a side
length of the regular hexagon is 30 .mu.m, and a width of the
channel shape is 25 .mu.m. Alternatively, a distance between the
regular hexagon and the channel shape adjacent to the regular
hexagon is 60 .mu.m, a side length of the regular hexagon is 45
.mu.m, and a width of the channel shape is 40 .mu.m. Alternatively,
a distance between the regular hexagon and the channel shape
adjacent to the regular hexagon is 60 .mu.m, a side length of the
regular hexagon is 60 .mu.m, and a width of the channel shape is 60
.mu.m.
[0254] For all of the textured patterns with the shape parameters,
a laser power is 14 W, a scanning speed is 800 mm/s, and the number
of processing is 2. The textured patterns are textured by:
texturing at least three columns of channel-shaped patterns, where
a preset distance is reserved between each pair of adjacent columns
of channel-shaped patterns, and the preset distance is greater than
a length of the longest diagonal line of the regular hexagon to be
textured; and texturing one column of regular-hexagonal patterns
between each pair of adjacent columns of channel-shaped
patterns.
Comparative Example
[0255] The tensile test is performed on the combination-shaped
textured patterns formed by alternately combining the channel
shapes and the regular hexagons with different dimensions prepared
in the above embodiment, and on an only-channel-shaped pattern and
an only-regular-hexagonal pattern after a coating is sprayed on the
respective pattern. The adhesion strength is indicated by a ratio
of a force under which the coating fractures from the substrate to
the area of the coating.
[0256] The testing results are as shown in FIG. 31 and FIG. 32.
FIG. 31 is a curve diagram showing comparison of adhesion strength
for the combination-shaped textured pattern, the
only-channel-shaped pattern and the only-regular-hexagonal pattern.
FIG. 32 shows adhesion strength between the coating and the
substrate for the combination-shaped textured patterns with
different dimensions formed by alternately combining the channel
shapes and the regular hexagons. Comparison of adhesion strength
for the combination-shaped textured patterns with different
dimensions is as shown in the following Table.
TABLE-US-00017 TABLE 17 Comparison of Adhesion strength for
Combination-shaped Textured Patterns with Different Dimensions Side
length of a regular hexagon 20 .mu.m 30 .mu.m 45 .mu.m 60 .mu.m
Width of a channel shape 15 .mu.m 25 .mu.m 40 .mu.m 60 .mu.m
Adhesion strength 36 MPa 42 MPa 53 MPa 62 MPa
[0257] In a case that the textured patterns are formed by
alternately combining the channel shapes and the regular hexagons,
the adhesion strength is affected by both the side length of the
regular hexagon and the width of the channel shape. Taking the
above Table as an example, the adhesion strength is at a minimum
value 36 MPa in a case that the side length of the regular hexagon
is 20 .mu.m and the width of the channel shape is 15 .mu.m. The
adhesion strength is at a maximum value 62 MPa in a case that the
side length of the regular hexagon is 60 .mu.m and the width of the
channel shape is 60 .mu.m. The adhesion strength is 42 MPa in a
case that the side length of the regular hexagon is 30 .mu.m and
the width of the channel shape is 25 .mu.m. The adhesion strength
is 53 MPa in a case that the side length of the regular hexagon is
45 .mu.m and the width of the channel shape is 40 .mu.m. It can be
seen that the adhesion strength increases with an increase in the
side length of the regular hexagon and an increase in the width of
the channel shape in a case that the side length of the regular
hexagon ranges from 20 .mu.m to 60 .mu.m and the width of the
channel shape ranges from 15 .mu.m to 60 .mu.m.
[0258] As compared with the single-shaped textured pattern, the
alternate-combination-shaped textured pattern has higher adhesion
strength. Comparison of adhesion strength for the
only-regular-hexagonal textured pattern, the only-channel-shaped
textured pattern and the combination-shaped textured pattern formed
by alternately combing the channel shapes with the same dimension
as the only-channel-shaped textured pattern and the regular
hexagons with the same dimension as the only-regular-hexagonal
textured pattern is as shown in the following Table.
TABLE-US-00018 TABLE 18 Comparison of Adhesion strength for
Single-Shaped Pattern and Combination-shaped Pattern with the same
Dimension Adhesion strength of an only-regular-hexagonal pattern
with 48 MPa a side length of 45 .mu.m Adhesion strength of an
only-channel-shaped pattern with 36 MPa a width of 40 .mu.m
Adhesion strength of a combination-shaped pattern of regular 53 MPa
hexagons with a side length of 45 .mu.m and channel shapes with a
width of 40 .mu.m
[0259] In the method provided in the present disclosure, the
adhesion strength of the sprayed coating is changed by changing a
combination manner of the textured patterns. For the textured
patterns in an only regular hexagon shape, an only channel shape
and a shape of alternately combining the regular hexagons and the
channel shapes, the respective adhesion strength of the sprayed
coating are different. As compared with the existing texturing
method for improving strength of the coating, the parameter of the
textured patterns is optimized. In the present disclosure, a laser
texturing method is used for controlling a parameter of the laser
process, to obtain textured geometrical patterns with dimensions
arranged regularly at a density on the surface of the substrate. As
a processing before spraying, the textured patterns formed by
alternately combining the regular hexagons and the channel shapes
are prearranged on a surface of a material. As compared with the
only-regular-hexagonal textured pattern and the only-channel-shaped
textured pattern, a problem in the single-shaped patterns that
stress is centralized in a certain direction and positions of
adhesion weak points are uniform can be solved with the
combination-shaped pattern. That is, in the only-regular-hexagonal
textured patterns, weak points of the regular hexagons are located
at the same or similar positions of the regular hexagons, which
results in easily cracking of the whole coating in a certain
direction. In the combination-shaped patterns, a weak point of the
regular-hexagonal textured pattern and a weak point of the
channel-shaped textured pattern are located at different positions
of the respective textured patterns. Therefore, the
regular-hexagonal textured pattern and the channel-shaped textured
pattern can complement with each other in a case that the
regular-hexagonal textured pattern and the channel-shaped textured
pattern are combined together, thereby improving the overall
adhesion strength. A mechanism in which the strength of the sprayed
coating is improved by combining the regular-hexagonal textured
pattern and the channel-shaped textured pattern is researched by
changing a characteristic of the single type of the traditional
textured pattern, and an optimal parameter of the textured patterns
for effectively improving adhesion strength of the coating is
further researched. Therefore, the bonding force between the
coating and the substrate is improved, so that the sprayed coating
can be applied into the engineering practices with a long service
life.
[0260] A structure for improving adhesion strength of a coating is
further provided according to the embodiment of the present
disclosure, which includes a substrate, textured patterns prepared
on the substrate, and a coating sprayed on the textured patterns.
The textured patterns include multiple columns of regular-hexagonal
patterns and multiple columns of channel-shaped patterns. The
regular-hexagonal pattern and the channel-shaped pattern are
arranged alternately. One column of channel-shaped patterns is
arranged between each pair of adjacent columns of regular-hexagonal
patterns. A distance between the regular hexagon and the channel
shape adjacent to the regular hexagon in the textured patterns is
65 .mu.m. A side length of the regular hexagon is at least one of
20 .mu.m, 30 .mu.m, 45 .mu.m or 60 .mu.m. A width of the channel
shape is at least one of 15 .mu.m, 25 .mu.m, 40 .mu.m or 60 .mu.m.
The substrate is made of stainless steel, and furthermore is made
of FV520B, and the coating is a NiCrBSi ceramic coating.
[0261] With the method in the present disclosure, the adhesion
strength of the sprayed coating is changed by changing the side
length of the square textured pattern, and the adhesion strength of
the sprayed coating changes with the side length of the square
textured pattern. As compared with the existing texturing method
for improving strength of the coating, a parameter of the textured
patterns is optimized. In the present disclosure, a laser texturing
method is used for controlling a parameter of the laser process, to
obtain textured geometrical patterns with dimensions arranged
regularly at a density on the surface of the substrate. As a
processing before spraying, square textured patterns with different
side lengths are prearranged on a surface of a material. A
mechanism for improving adhesion strength of the sprayed coating
for different side lengths is researched by changing the side
length of the square textured pattern, and an optimal side length
of the textured pattern for effectively improving adhesion strength
of the coating is further researched. Therefore, bonding force
between the coating and the substrate is improved, so that the
sprayed coating can be applied into the engineering practices with
a long service life.
[0262] In the above embodiments, the substrate is made of stainless
steel, and furthermore is made of FV520B, a processing depth of the
obtained textured patterns is 60 .mu.m, and the selected coating is
a NiCrBSi ceramic coating. A sprayed coating with a depth of 500
.mu.m is obtained by supersonic plasma spraying. A particle size of
NiCrBSi powder ranges from 50 .mu.m to 60 .mu.m. The laser used
here is a pulse laser. The depth of the textured pattern is
depended on the energy of the laser and the number of processing.
Textured patterns in a shape with a dimension and a distance may be
drawn in advance using system-provided drawing software, and a
surface of a specimen is processed, to obtain textured patterns in
a structure with an accurate dimension.
[0263] The foregoing is only preferred embodiments of the present
disclosure, it should be noted that multiple improvements and
modifications can also be made by those skilled in the art without
departing from the technical principle of the present disclosure,
and the improvement and the modification are regarded to fall
within the protection scope of the present disclosure.
[0264] The embodiments of the present disclosure are described in a
progressive way, and each embodiment lays emphasis on differences
from other embodiments. For the same or similar parts between
various embodiments, one may refer to the description of other
embodiments.
[0265] According to the above description of the disclosed
embodiments, those skilled in the art can implement or practice the
present disclosure. Many modifications to these embodiments are
apparent for those skilled in the art, and general principles
defined herein may be implemented in other embodiments without
departing from the spirit or scope of the present disclosure.
Hence, the present disclosure is not limited to the embodiments
disclosed herein, but is to conform to the widest scope in
accordance with the principles and novel features disclosed
herein.
* * * * *