U.S. patent application number 12/678667 was filed with the patent office on 2010-10-14 for composition for sliding member and sliding member coated with the composition.
This patent application is currently assigned to TAIHO KOGYO CO., LTD.. Invention is credited to Mitsuaki Hakamata.
Application Number | 20100261625 12/678667 |
Document ID | / |
Family ID | 40511533 |
Filed Date | 2010-10-14 |
United States Patent
Application |
20100261625 |
Kind Code |
A1 |
Hakamata; Mitsuaki |
October 14, 2010 |
COMPOSITION FOR SLIDING MEMBER AND SLIDING MEMBER COATED WITH THE
COMPOSITION
Abstract
An object of the invention is to provide a composition for a
sliding member capable of forming a lubricating film which does not
occur large cracks in the lubricating film formed even if the
formed lubricating film is pressed and slid, large peeling off of
the lubricating film is restrained from occurring, and improved in
abrasion resistance. The invention provides the composition for the
sliding member containing a base resin and nano metal particles
softer than the counterpart material of sliding, wherein the
content of the soft nano metal particles is 5 vol % or less.
Inventors: |
Hakamata; Mitsuaki; (Aichi,
JP) |
Correspondence
Address: |
SUGHRUE-265550
2100 PENNSYLVANIA AVE. NW
WASHINGTON
DC
20037-3213
US
|
Assignee: |
TAIHO KOGYO CO., LTD.
Aichi
JP
|
Family ID: |
40511533 |
Appl. No.: |
12/678667 |
Filed: |
September 26, 2008 |
PCT Filed: |
September 26, 2008 |
PCT NO: |
PCT/JP2008/067551 |
371 Date: |
March 17, 2010 |
Current U.S.
Class: |
508/103 ;
508/100; 508/108; 508/150; 508/154; 508/165; 508/166 |
Current CPC
Class: |
F16C 2240/40 20130101;
B82Y 30/00 20130101; C10N 2020/06 20130101; F16C 2240/48 20130101;
C10M 125/10 20130101; C10M 2217/0285 20130101; F16C 33/208
20130101; F16C 2208/40 20130101; C08J 5/005 20130101; C10N 2050/025
20200501; F16C 2240/60 20130101; C10N 2030/06 20130101; C10M
2213/062 20130101; C10M 2201/065 20130101; C10M 2201/041 20130101;
C10M 125/00 20130101; C09D 179/08 20130101; F16C 2208/42 20130101;
C10M 2217/0443 20130101; C10M 2201/062 20130101; F16C 33/201
20130101; C08G 73/14 20130101; C08J 2379/08 20130101; C09D 179/08
20130101; C08K 3/04 20130101; C08K 3/30 20130101; C08K 5/3415
20130101; C08L 27/08 20130101 |
Class at
Publication: |
508/103 ;
508/150; 508/166; 508/165; 508/154; 508/108; 508/100 |
International
Class: |
C10M 125/04 20060101
C10M125/04; C10M 125/00 20060101 C10M125/00; C10M 125/10 20060101
C10M125/10 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 27, 2007 |
JP |
2007-252610 |
Claims
1. A composition for a sliding member comprising: a base resin; and
metal nano-particles, wherein the metal nano particles are softer
than a counterpart member to be slid on the sliding member, and
wherein a content of the soft metal nano particles is 5 vol % or
less.
2. The composition for the sliding member as set forth in claim 1,
wherein the soft metal nano particles are at least one substance
selected from the group consisting of single metal, oxide and
sulfide of Cu, Ag, Bi, Al, Sn, Pb, In, Mg, Zn, Au and Sb, the group
excepting Al oxide and sulfides of Bi, Al, Sn and In.
3. The composition for the sliding member as set forth in claim 1,
wherein an average particle size of the soft metal nano particles
is from 0.1 to 100 nm.
4. (canceled)
5. (canceled)
6. (canceled)
7. (canceled)
8. The composition for the sliding member as set forth in claim 2,
wherein an average particle size of the soft metal nano particles
is from 0.1 to 100 nm.
9. The composition for the sliding member as set forth in claim 1,
further comprising solid lubricant, wherein a content of the solid
lubricant is from 20 to 80 vol %.
10. The composition for the sliding member as set forth in claim 2,
further comprising solid lubricant, wherein a content of the solid
lubricant is from 20 to 80 vol %.
11. The composition for the sliding member as set forth in claim 3,
further comprising solid lubricant, wherein a content of the solid
lubricant is from 20 to 80 vol %.
12. The composition for the sliding member as set forth in claim
11, wherein the content of the solid lubricant is from 20 to 70 vol
%.
13. The composition for the sliding member as set forth in claim
12, wherein the content of the solid lubricant is from 20 to 50 vol
%.
14. A sliding member comprising a base member coated with the
composition for the sliding member as set forth in claim 1.
15. A sliding member comprising a base member coated with the
composition for the sliding member as set forth in claim 2.
16. A sliding member comprising a base member coated with the
composition for the sliding member as set forth in claim 3.
Description
TECHNICAL FIELD
[0001] The present invention relates to a composition for a sliding
member. More specifically, the invention relates to a composition
for the sliding member, which is applied to a surface of the
sliding member and provided a lubricating film having in good
abrasion resistance. That is, when the lubricating film is formed
on the surface of the sliding member, even if the formed
lubricating film is pressed and slid, large cracks in the
lubricating film is not formed and large peeling off of the
lubricating film is restrained from occurring.
BACKGROUND ART
[0002] Compositions for sliding members for lubricating sliding
member of machinery such as fluid machinery, for example, swash
plate compressor, are known. These compositions for sliding members
are coated on the surface of each sliding members, such as a piston
or a bearing, and function as lubricating films. Accordingly, these
compositions for sliding members are required that the lubricating
films have low friction coefficient and excellent abrasion
resistance without being abraded by long-term use, and good
conformability with a counterpart member.
[0003] As such compositions for sliding members, compositions
containing solid lubricant in base resin, or compositions
containing hard fine particles having a particle size in the order
of .mu.m in base resin are known. For example, patent document 1
discloses that a composition for a sliding member includes 70 to 97
mass % of solid lubricant selected from molybdenum disulfide,
tungsten disulfide, boron nitride, graphite and carbon fibers, and
3 to 30 mass % of the base resin. The base resin includes resin
selected from a polyimide-based resin, an epoxy resin and a phenol
resin, and a film-forming assistant agent.
[0004] Also, patent document 2 discloses a base resin of a
composition for a sliding member selected from polyamideimide,
polyimide-based and epoxy-based resin. Further, the base resin
contains a solid lubricant including 10 to 40 vol % of molybdenum
disulfide, 10 to 40 vol % of flake graphite or vein graphite, and
10 to 40 vol % of polytetrafluoroethylene. Furthermore, a sum total
of the solid lubricant is from 30 to 60 vol %, and the remainder is
substantially the base resin.
[0005] Still further, patent document 2 discloses a composition for
a sliding member including the base resin containing hard fine
particles having the particle size of 0.01 to 3 .mu.m. The fine
particles are such as zinc sulfide, alumina, silica, silicon
carbide, silicon nitride, or etc.
[0006] Patent Document 1: Japanese Patent Unexamined Publication
No. JP-A-7-247493
[0007] Patent Document 2: Japanese Patent Unexamined Publication
No. JP-A-2005-089514
DISCLOSURE OF THE INVENTION
Problems that the Invention is to Solve
[0008] However, as shown in FIG. 1, in above described composition
for the sliding member are used as a lubricating film, large cracks
are occurred in the formed lubricating film when pressed and slid,
and are sometimes detached with additive agents such as solid
lubricant and hard particles. Then, further peeling off and
abrasion of a sliding faces are caused from the thus formed peeling
off trace. That is, the peeling off trace becomes origin of further
peeling off. Additionally, secondary damage may be caused because
the detached large pieces stick to the counterpart member, and then
the surface of the counterpart member becomes coarse. For all of
above reason, the abrasion of the sliding surface is prompted.
[0009] In view of the circumstances, an object of the invention is
to provide a composition for a sliding member which provides a
lubricating film in good abrasion resistance. That is, even if the
formed lubricating film is pressed and slid, large cracks in the
lubricating film are not formed and large peeling off of the
lubricating film is restrained from occurring.
Means for Solving the Problems
[0010] As a result of experiments for achieving the above object,
as for a composition fora sliding member, the present inventor has
found that by bringing nano metal particles softer than a
counterpart material in a base resin, a generation of cracks can be
guided around the nano particles. Thereby, even if the formed
lubricating film is pressed and slid, a generation of large cracks
and a generation of large peeling off in the lubricating film are
prevented. Thus, the invention has been accomplished.
[0011] That is, for attaining the above mentioned object, according
to the present invention, there are provided following aspects.
(1) A composition for a sliding member including a base resin and
plurality of nano metal particles, wherein the nano metal particles
are softer than the sliding member to be slid, and a content of the
soft nano metal particles is 5 vol % or less. (2) The composition
for the sliding member as set forth in (1), wherein the soft nano
metal particles are at least one substance selected from single
metal, oxide and sulfide of Cu, Ag, Bi, Al, Sn, Pb, In, Mg, Zn, Au
and Sb except for Al oxide and sulfides of Bi, Al, Sn and In. (3)
The composition for the sliding member as set forth in (1) or (2),
wherein an average particle size of the soft nano metal particles
is from 0.1 to 100 nm. (4) The composition for the sliding member
as set forth in any one of (1) to (3), further including solid
lubricant wherein a content of the solid lubricant is from 20 to 80
vol %. (5) The composition for the sliding member as set forth in
(4), wherein the content of the solid lubricant is from 20 to 70
vol %. (6) The composition for the sliding member as set forth in
(5), wherein the content of the solid lubricant is from 20 to 50
vol %. (7) A sliding member coated with the composition for the
sliding member as set forth in any one of (1) to (6) as a base
member.
ADVANTAGE OF THE INVENTION
[0012] When the composition for the sliding member of the invention
is applied and coated on a surface of the sliding member to form
the lubricating film, the invention provides the lubricating film
having in good abrasion resistance.
[0013] Because generation of cracks is guided around the nano
particles due to the contained soft nano metal particles, even if
the formed lubricating film is pressed and slid, generation of
large cracks and a generation of large peeling off in the
lubricating film are restrained from occurring. As shown in FIG. 2,
in the lubricating film formed of the composition for the sliding
member of the invention, even if peeling off occurs, the peeling
off is minute due to the contained soft nano metal particles.
Therefore, large peeling off is restrained from occurring, so that
secondary damage of sticking of large pieces to the counterpart
member is not caused.
[0014] Further, as shown in FIG. 3, in the lubricating film formed
of the composition for the sliding member of the invention, it is
considered that when the contained soft nano metal particles are
exposed to the surface, the soft nano metal particles are crushed
by sliding with the counterpart member. Furthermore, the soft nano
metal particles are beaten out and transferred to the counterpart
member so as to form a thin film. This film is presumably superior
in a sliding property, and so the sliding property is much more
improved.
BRIEF DESCRIPTION OF THE DRAWINGS
[0015] FIG. 1 shows mechanism of peeling off and abrasion of a
lubricating film formed of a conventional composition for a sliding
member.
[0016] FIG. 2 shows mechanism of peeling off and abrasion of a
lubricating film formed of a composition for a sliding member of
the invention.
[0017] FIG. 3 shows the mechanism of transfer of soft nano metal
particles from the lubricating film formed of the composition for
the sliding member of the invention to the counterpart member.
[0018] FIG. 4 shows a rotational vibration tester used in
examples.
[0019] FIG. 5 is a front view of the rotational vibration tester
used in the examples with Rr face of a swash plate being the
front.
DESCRIPTION OF REFERENCE NUMERALS AND SIGNS
[0020] 1: Rotational vibration tester [0021] 2: Motor [0022] 3:
Piston [0023] 4: Shoe [0024] 5: Cylinder [0025] 6: Swash plate
[0026] 7: Oil mist injection nozzle
BEST MODE FOR CARRYING OUT THE INVENTION
[0027] As a base resins for use in a composition for a sliding
member of the invention, various kinds of resins used as the base
resins of the composition for the sliding member can be arbitrarily
used, however, resins having excellent in heat resistance such as
polyimide resins, e.g., polyamideimide and polyimide, epoxy resins
and phenol resins can be preferably used. Resins having tensile
strength of 150 MPa or more and elongation of 40% or more are
especially preferable to use.
[0028] The composition for the sliding member of the invention
contains soft nano metal particles. Here, soft metal means metals
softer than the counterpart member of sliding. As the soft nano
metal particles, nano particles of single metal, oxide and sulfide
of soft metals such as Cu, Ag, Bi, Al, Sn, Pb, In, Mg, Sb, Zn, and
Au except for Al oxide and sulfides of Bi, Al, Sn, and In can be
used. The soft nano metal particles can be used by only one kind,
or two or more can be used in combination. The shapes of the soft
nano metal particles to be used are not restricted and spherical,
massive and flat shapes can be used, however, in the viewpoint of
sliding property, in particular, attacking property of counterpart
member, spherical particles are preferred. The average particle
size of the soft nano metal particles is preferably from 0.1 to 100
nm, and more preferably from 0.1 to 40 nm. The average particle
size of 0.1 to 100 nm is preferred in the view of peeling off
resistance of the lubricating film and transfer of the nano metal
particles.
[0029] As preferably used soft nano metal particles, CuO, Ag, ZnO,
SnO.sub.2, Au, In.sub.2O.sub.3, Bi.sub.2O.sub.3, the above are
manufactured by C. I. KASEI CO., LTD. under the names of "Nano Teck
Powder", are exemplified. For obtaining these nano particles, for
example, a following method, what it called a PVS method, is
exemplified. Initially, thermal energy is imparted on the raw
material, so that gasified metal atom is generated. Subsequently,
the gasified metal atom contacts with reaction gas such as oxygen
or the like so as to obtain molecules and clusters of a metal
oxide. Then, the metal oxide is instantly cooled and the above nano
particles are obtained.
[0030] The content of soft nano metal particles in the composition
for the sliding member of the invention is more than 0 vol % and 5
vol % or less, and preferably 1 vol % or less. When the content
exceeds 5 vol %, the nano metal particles are agglomerated, and
there is a risk that a sliding property peculiar to nano metal
particles may lose.
[0031] In the composition for the sliding member of the invention,
if necessary, solid lubricants similar to those used in
conventional compositions for the sliding member, e.g.,
polytetrafluoroethylene, molybdenum disulfide, tungsten disulfide,
boron nitride, graphite, carbon fibers, etc., can be contained in
the base resin. Solid lubricants may be used by only one kind, or
two or more may be used in combination. The average particle size
of solid lubricants is generally preferably from 0.5 to 30 .mu.m.
By the use of solid lubricants, the sliding property is improved.
When using solid lubricants, the content of the solid lubricants is
preferable from 20 to 80 vol %, more preferable from 20 to 70 vol
%, and furthermore preferable from 20 to 50 vol %. When the content
is more than 80 vol %, it is difficult to form the lubricating
film. While when the content is less than 20 vol %, the sliding
property lowers a little.
[0032] The composition for the sliding member of the invention can
be prepared according to ordinary methods. In general, the
composition can be prepared by mixing a certain amount of each
composition components such as base resin, soft nano metal
particles, if necessary, a solid lubricant and so on, and an
organic solvent by using a mixer, e.g., a Henschel mixer, a super
mixer, a ball mill, a tumbler mixer, a bead mill, a kneader, etc.
At this time, as the organic solvent, solvents which can dissolve
the base resin are arbitrarily exemplified NMP, xylene, alcohol and
the like. The kinds of solvents depend upon the kinds of base
resins. The amount of the organic solvent can be arbitrarily set
according to the desired viscosity of the obtained composition for
the sliding member.
[0033] The lubricating film made of the composition for the sliding
member of the invention on the surface of the sliding member can
also be formed according to ordinary methods. In general, the
composition for the sliding member is coated on a surface of the
sliding member by a spraying method, a roll coat method, a dipping
method, screen printing, pad printing, or the like, and then the
coated layer is hardened by heating so as to form the lubricating
film. At this time, the heating and hardening condition of the
coated layer may be ordinary heating condition suited to materials
to be used, although it depends upon the kind of the base
resin.
[0034] The thickness of the lubricating film formed on the surface
of the sliding member can be optionally set as necessary, however,
generally from 5 to 50 .mu.m is preferred.
[0035] The composition for the sliding member of the invention can
be preferably widely applied to sliding parts of machinery such as
fluid machinery, and especially preferably applied to sliding parts
of sliding bearing such as the swash plate of the swash plate type
compressor, half bearing, bush and washer or the like.
Example
[0036] The invention will be specifically described with reference
to examples and comparative examples, but the invention should not
be restricted thereto.
Examples 1-1, 1-2 and Comparative Examples 1-1 to 1-4>
[0037] The following raw materials for the preparation of the
composition for the sliding member were prepared.
[Base Resin]
[0038] Polyimide resin (PI): "HCI-1200M", manufactured by Hitachi
Chemical Co., Ltd.
[Solid Lubricant]
[0039] Polytetrafluoroethylene (PTFE): manufactured by Kitamura
Limited (average particle size: 3 .mu.m)
[0040] Graphite (Gr): manufactured by Nippon Graphite Industries,
Ltd. (average particle size: 1 .mu.m)
[Soft Nano Metal Particles]
[0041] Copper oxide (CuO): "Nano Teck Powder", manufactured by C.
I. KASEI CO., LTD. (average particle size 30 nm, spherical
shape)
[0042] Zinc oxide (ZnO): "Nano Teck Powder", manufactured by C. I.
KASEI CO., LTD. (average particle size 30 nm, polyhedral shape)
[Hard Fine Particles Used in Conventional Compositions for the
Sliding Member]
[0043] Aluminum oxide (Al.sub.2O.sub.3): "Nano Teck Powder",
manufactured by C.I. KASEI CO., LTD. (average particle size 30 pm,
spherical shape)
[0044] Aluminum oxide (Al.sub.2O.sub.3): "Admafine", manufactured
by Admatechs Co., Ltd. (average particle size: 1 pm, spherical
shape)
[0045] Aluminum oxide (Al.sub.2O.sub.3): "Al.sub.2O.sub.3 reagent",
manufactured by Merck KGaA (average particle size: 1 .mu.m, massive
shape)
[0046] The following organic solvent was used to mix the above raw
materials.
[0047] Organic solvent: NMP
[0048] In the above raw materials, 54.9 vol % of polyimide resin,
22.5 vol % of PTFE, and 22.5 vol % of graphite were mixed with the
organic solvent to prepare a base coating agent, 0.1 vol % of each
of particles shown in Table 1 below was added to the base coating
agent, and mixed by using a bead mill to obtain liquid composition
for the sliding member.
[0049] The obtained liquid composition for the sliding member
coated on an iron-based base member by roll coating, and the film
was heated at 300.degree. C. for 1 hour and hardened to obtain the
lubricating film having a thickness of 15 pm.
[0050] The seizure pressure was measured on the formed lubricating
film, and the appearance of the slid surface after measurement was
observed. The results of tests are shown in Table 1 below.
<The Seizure Pressure Test>
[0051] Tester: Three pins/a disc type seizure pressure tester
Rotation number: 4,000 r/min Lubricating condition: Mist
lubrication Counterpart shaft: SUJ2 (a shoe type) Load condition:
Gradual increase from preload of from 1 MPa to 3 MPa/15 minutes
TABLE-US-00001 TABLE 1 Example Example Comparative Comparative
Comparative Comparative 1-1 1-2 Example 1-1 Example 1-2 Example 1-3
Example 1-4 Particles Kind CuO ZnO None Al.sub.2O.sub.3
Al.sub.2O.sub.3 Al.sub.2O.sub.3 Average 30 nm 30 nm -- 30 nm 1
.mu.m 1 .mu.m particle size Shape Spherical Polyhedral -- Spherical
Spherical Massive Test Seizure 13.5 12 10 13.5 10 8 results
pressure (MPa) Appearance No peeling No peeling The film was The
film was The film was The film was after off. off. peeled. peeled.
peeled. peeled. sliding The base The base Adhesion material
material occurred. was not was exposed. exposed by abrasion.
[0052] From the results in Table 1, samples containing nano
particles are high in the seizure pressure, and it can be seen that
the sliding surfaces of the samples containing soft and spherical
nano particles are little damaged.
Examples 2-1, 2-2 and Comparative Examples 2-1 to 2-3
[0053] The following raw materials were prepared for the
composition for the sliding member.
[Base Resin]
[0054] Polyamideimide resin (PAI): "HPC-6000", manufactured by
Hitachi Chemical Co., Ltd.
[0055] Polyimide resin (PI): "HCI-1200M", manufactured by Hitachi
Chemical Co., Ltd.
[Solid Lubricant]
[0056] Polytetrafluoroethylene (PTFE): manufactured by Kitamura
Limited (average particle size: 3 .mu.m)
[0057] Graphite (Gr): manufactured by Nippon Graphite Industries,
Ltd. (average particle size: 1 pm)
[Soft Nano Metal Particles]
[0058] Copper oxide (CuO): "Nano Teck Powder", manufactured by C.I.
KASEI CO., LTD. (average particle size 30 nm)
[Hard Fine Particles Used in Conventional Compositions for the
Sliding Member]
[0059] Titanium dioxide (TiO.sub.2): "Nano Teck Powder",
manufactured by C.I. KASEI CO., LTD. (average particle size 30
nm)
[0060] The following organic solvent was used to mix the above raw
materials.
[0061] Organic solvent: NMP
[0062] The above raw materials were mixed by using the bead mill in
the ratio shown in Table 2 below to obtain the liquid composition
for the sliding member.
[0063] The obtained liquid composition for the sliding member
coated on an iron-based base member by roll coating, and the film
was heated on the condition not exceeding the decomposition
temperature of PTFE (320.degree. C. or lower), and hardened to
obtain the lubricating film having a thickness of 15 .mu.m.
[0064] Rotation vibration test and rotation load test of each of
the formed lubricating films were carried out as follows. The
results of the rotation vibration test and rotation load test are
shown in Table 2 below.
[Rotation Vibration Test]
[0065] Rotation vibration test was carried out with rotation
vibration tester 1 shown in FIG. 4 on the following condition. In
the tester, piston 3 reciprocates from side to side by rotating the
swash plate 6 installed at the motor shaft with an inclination by 5
degrees, as the side of motor 2 is front face (Fr face) and the
side of cylinder 5 is rear face (Rr face).
Test condition: Rotation speed of the rotation vibration tester
gradually increases from 1,000 r/min to 7,000 r/min at 1,000 r/min,
and then the rotation speed of 7,000 r/min was maintained. The load
was 215 g. The test time was determined for 36 minutes including
the time of gradual increase of the rotation speed. Lubricating
condition: Paraffin oil was injected in an oil mist state by 1.1
g/min on the Fr face of the swash plate and 0.6 g/min on the Rr
face.
[Rotation Load Test]
[0066] Test condition: The rotation speed was fixed at 9,500 r/min.
The load was gradually increased from 3.8 MPa to 12.6 MPa at 1.6
MPa/3 minutes, and then the load of 12.6 MPa was maintained. The
test time was determined for 78 minutes including the time of
gradual increase of the load. Lubricating condition: A mixture of a
coolant and refrigerating machine oil was supplied in a mist
state.
[Evaluation Criteria of the Both Tests]
[0067] Rotation vibration: The one that ran at 7,000 r/min for 36
minutes including the time of gradual increase of the rotation
number was graded as one having sufficient properties. Rotation
load: The one that ran at 9,500 r/min, 12.6 MPa for 78 minutes
including the time of gradual increase of the load was graded as
one having sufficient properties.
TABLE-US-00002 TABLE 2 Example Example Comparative Comparative
Comparative 2-1 2-2 Example 2-1 Example 2-2 Example 2-3 Raw PAI
(vol %) 54.9 -- 54.9 -- -- materials PI (vol %) -- 54.9 -- 54.9 55
PTFE (vol %) 25 22.5 25 22.5 22.5 Gr (vol %) 20 22.5 20 22.5 22.5
CuO (vol %) 0.1 0.1 -- -- -- TiO.sub.2 (vol %) -- -- 0.1 0.1 --
Results Results of Cleared the Seizure was Seizure was Seizure was
Cleared the of tests Rotation test for 36 occurred when occurred
when occurred when test for 36 Vibration minutes. 15 min 30 sec 9
min has 11 min 50 sec minutes. Test has passed. passed. has passed.
Results of Cleared the Cleared the Seizure was Cleared the Seizure
was Rotation test for 78 test for 78 occurred when test for 78
occurred when Load Test minutes. minutes. 38 min has minutes. 15
min has passed. passed.
[0068] From the results in Table 2, it has been cleared that the
compositions for the sliding member of the invention have excellent
abrasion resistance.
[0069] While the invention has been described in detail and with
reference to specific examples thereof, it will be apparent to
skilled person in the art that various changes and modifications
can be made therein without departing from the spirit and scope
thereof. The present application is based on Japanese patent
application filed on Sep. 27, 2007 (Japanese Patent Application No.
2007-252610), and the disclosure of which is incorporated herein as
reference.
INDUSTRIAL APPLICABILITY
[0070] When the composition for the sliding member of the invention
is applied and coated on the surface of the sliding member to form
the lubricating film, the invention provides the lubricating film
having in good abrasion resistance. That is, because generation of
cracks is guided around the nano particles due to the contained
soft nano metal particles, even if the formed lubricating film is
pressed and slid, generation of large cracks and a generation of
large peeling off in the lubricating film are prevented.
* * * * *