U.S. patent application number 11/219542 was filed with the patent office on 2005-12-29 for pt alloy for ornament.
Invention is credited to Azuma, Masahiko, Naruse, Shigeyasu, Osada, Masami.
Application Number | 20050284257 11/219542 |
Document ID | / |
Family ID | 35504113 |
Filed Date | 2005-12-29 |
United States Patent
Application |
20050284257 |
Kind Code |
A1 |
Osada, Masami ; et
al. |
December 29, 2005 |
Pt alloy for ornament
Abstract
A novel alloy contains Pt as a principal component and also
contains 0.1 to 15% Ru and 0.1 to 15% Ir in weight rate in Pt to
overcome a problem in that Vickers hardness (Hv) of the
conventional Pt-based alloys do not correspond to requirements in
diversified ornaments because of their respective Vickers hardness
(Hv): Hv 125 to 135 for Pt--Pu-based alloys and Hv 80 to 100 for
Pt--Ir-based alloys.
Inventors: |
Osada, Masami; (Tokyo,
JP) ; Azuma, Masahiko; (Tokyo, JP) ; Naruse,
Shigeyasu; (Tokyo, JP) |
Correspondence
Address: |
Levisohn, Berger & Langsam LLP
19th Floor
805 Third Avenue
New York
NY
10022
US
|
Family ID: |
35504113 |
Appl. No.: |
11/219542 |
Filed: |
September 2, 2005 |
Current U.S.
Class: |
75/228 |
Current CPC
Class: |
A44C 27/003 20130101;
C22C 5/04 20130101 |
Class at
Publication: |
075/228 |
International
Class: |
B22F 001/00; B22F
003/00 |
Foreign Application Data
Date |
Code |
Application Number |
Mar 9, 2004 |
JP |
2004-256910 |
Claims
What is claimed is:
1. A Pt alloy for an ornament, comprising 0.1 to 15% Ru, 0.1 to 15%
Ir, and the remainder consisting of Pt in weight rate.
2. A Pt alloy for an ornament, comprising 0.1 to 14% Ru, 0.1 to 14%
Ir, 0.1 to 5.0% Ag, 0.1 to 5.0% Cu, and the remainder consisting of
Pt in weight rate.
3. A Pt alloy for an ornament, comprising 0.1 to 14% Ru, 0.1 to 14%
Ir, 0.1 to 5.0% Ga, 0.1 to 5.0% In, and the remainder consisting of
Pt in weight rate.
4. A Pt alloy for an ornament, comprising 0.1 to 14% Ru, 0.1 to 14%
Ir, 0.1 to 5.0% Ag, 0.1 to 5.0% Cu, 0.1 to 5.0% Ga, 0.1 to 5.0% In,
and the remainder consisting of Pt in weight rate.
Description
BACKGOURND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to a Pt alloy for an ornament,
which can be used as raw materials of plate materials, wire rods,
and process and cast materials thereof, including rings, necklaces,
brooches, earrings, pierced earrings, and tiepins.
[0003] 2. Description of Related Art
[0004] Pt alloys for ornaments, which have been known in the art,
include Pt--Ru alloys and Pt--Ir alloys (see, for example, JP
2003-321719 A and JP 2003-96525 A).
[0005] Furthermore, Pt--Pd-based Pt alloys prepared by additive Ru
and/or Ir to Pt--Pd alloys have been also known in the art (see,
for example, JP 2-43333 A).
[0006] The conventional Pt-based alloys have their respective
Vickers hardness (Hv): Hv 125 to 135 for Pt--Ru-based alloys, Hv 80
to 100 for Pt--Ir-based alloys, and Hv 120 to 135 for Pt--Pd-based
alloys additive with Ru and/or Ir.
[0007] However, in many cases, those Vickers hardness do not
correspond to requirements in diversified ornaments.
Conventionally, in particular, Pt-based alloys have been mainly
worn by old people. In recent years, the products of Pt-based
alloys also have gained popularity among young people and also have
been worn by them. Based on this fact, rings, pierced earrings,
earrings, and the other ornaments tend to thinner and smaller and
the ways of wearing them also become diversified, while causing
problems in strength enough to cope with troubles such as scratches
and deformation.
[0008] The present invention has been made to solve the foregoing
problems. Therefore, an object of the present invention is to
provide a Pt-based alloy for an ornament having hardness enough to
endure scratches and deformation.
SUMMARY OF THE INVENTION
[0009] The present invention provides an alloy that contains Pt as
a principal component and also contains 0.1 to 15% Ru and 0.1 to
15% Ir in weight rate in Pt.
[0010] Also, the present invention provides a Pt-based alloy that
contains 0.1 to 14% Ru, 0.1 to 14% Ir, 0.1 to 5.0% Ag, and 0.1 to
5.0% Cu in weight rate in Pt.
[0011] Also, the present invention provides a Pt-based alloy that
contains 0.1 to 14% Ru, 0.1 to 14% Ir, 0.1 to 5.0% Ga, and 0.1 to
5.0% In in weight rate in Pt.
[0012] Furthermore, the present invention provides a Pt-based alloy
that contains 0.1 to 14% Ru, 0.1 to 14% Ir, 0.1 to 5.0% Ag, 0.1 to
5.0% Cu, 0.1 to 5.0% Ga, and 0.1 to 5.0% In in weight rate in
Pt.
[0013] According to those alloy compositions, the basic composition
of the Pt--Ru--Ir-based alloy showed a Vivkers hardness (Hv) of 150
or more in the as-cast condition. In addition, the composition of
Pt--Ru--Ir--Ag--Cu-based alloy showed a Vickers hardness (Hv) of
170 or more. Furthermore, the composition of the
Pt--Ru--Ir--Ag--Cu--Ga--In-base- d alloy showed a Vickers hardness
(Hv) of 160 or more in the as-cast condition.
[0014] From those values, the composition of the Pt--Ru--Ir-based
alloy showed excellent hardness, compared with alloy having 85% Pt,
90% Pt, and 95% Pt in weight ratio. Furthermore, the reason of
additive other elements such as Ag, Cu, Ga, and In to the above
composition of the Pt--Ru--Ir-based alloy is as follows: Ornament
raw materials are not only provided for wire rods or plate
materials but also applied in casting production. Thus, they may
demand casting properties. For fulfilling such demands, for
example, fluidity and casting surface were improved by the addition
of Ag and Cu and also a decrease in melting point was attained by
the addition of Ga and In.
[0015] The addition of 0.1 to 5.0% Ru to the composition of the
alloy is for exerting an effect on hardness. Less than 0.1% Ru
causes no effect, while more than 5.0% Ru increases the number of
blow holes generated in the alloy.
[0016] The addition of 0.1 to 5.0% Ir to the composition of the
alloy is for exerting an effect on hardness. When the content of Ir
is less than 0.1%, it does not contribute to miniaturization of
alloy crystals. Thus, the hardness of the alloy is not influenced
by the additive of Ir. In other words, no effect of Ir added can be
obtained. When the content of Ir exceeds more than 5.0%, the alloy
is difficult to be processed because of being hardened and
fragile.
[0017] The addition of less than 0.1% of Ag to the composition of
the alloy causes no improvement in fluidity and casting surface,
while more than 5.0% of Ag causes a decrease in hardness.
[0018] When Cu is added to the composition of a Pt- or Pd-based
alloy, Cu may be expected to cause age-hardening of the alloy.
However, the addition of less than 0.1% of Cu does not cause any
effect. For considering the balance with the contents of other
metals added, the upper limit of Cu was set to 5.0%.
[0019] When each addition of Ga and In is less than 0.1%, no
dropping effect is exerted on the melting point of the alloy. When
the addition amount is more than 5.0%, the alloy becomes fragile
and then becomes difficult to be processed, resulting in the alloy
unsuitable to ornamental use.
[0020] Consequently, the present invention intends to increase the
hardness of a Pt-based alloy for an ornament not by the independent
additive of one of Ru and Ir but by the addition of Ru and Ir to
the composition of the alloy to obtain a multi-element alloy.
Besides, an improvement of hardness can be attained when the alloy
is provided as a multi-element alloy added with Ag and Cu. In
addition, the addition of Ga and In brings about an effect of
providing an unprecedented new ornamental material in terms of its
hardness and melting point.
EXAMPLES
[0021]
1 TABLE 1 Casting Blow Melting Pt Ru Ir Ag Cu Ga In Hardness
Castability surface hole point Example 1 85 5 10 185 good good null
1752 Example 2 90 3 7 168 excellent excellent null 1748 Example 3
95 2 3 155 excellent excellent null 1751 Example 4 85 3 7 3 2 174
good excellent null 1713 Example 5 90 2 5 2 1 163 excellent
excellent null 1733 Example 6 95 1 2 1 1 151 excellent excellent
null 1772 Example 7 85 3 7 3 2 186 excellent good null 1628 Example
8 90 2 5 2 1 177 excellent good null 1557 Example 9 95 1 2 1 1 173
excellent excellent null 1672 Example 10 85 1 5 3 2 3 1 166 good
good null 1625 Example 11 90 1 2 2 1 3 1 147 good good null 1593
Example 12 95 1 2 0.5 0.5 0.5 0.5 143 good good null 1688
Component: Weight % Hardness: Hv Melting point: .degree. C.
[0022]
2 TABLE 2 Casting Blow Melting Pt Pd Ru Ir Cu Co Hardness
Castability surface hole point Pt850 85 10 5 125 excellent
excellent slight 1730 Pt900 90 10 80 excellent excellent Null 1740
Pt950 95 5 120 excellent excellent Null 1775 Pt850 85 10 3 2 110
good good slight 1750 Pt900 90 7 3 115 excellent excellent Null
1765 Pt950 95 5 90 good good null 1780 Component: Weight %
Hardness: Hv Melting point: .degree. C.
[0023] As listed in Table 1, a Pt-based alloy added with both Ru
and Ir attained an increase in hardness. We have found that the
hardness of such an alloy largely surpasses that of alloy
independently added with one of Ru and Ir.
[0024] In addition, a Pt--Ru--Ir-based alloy added with both Ag and
Cu kept its sufficient hardness while lowering its melting point
without causing blow holes and rough casting surface, resulting in
good casting properties.
[0025] In addition, a Pt--Ru--Ir-based alloy added with both Ga and
In showed a significant drop of melting point. Furthermore, a
Pt--Ru--Ir--Ag--Cu-based alloy added with both Ga and In showed a
significant drop of melting point without causing blow holes,
resulting in a good cast. Therefore, the Pt--Ru--Ir--Ag--Cu-based
alloy can be sufficiently available as a Pt alloy for an
ornament.
[0026] Those tests were carried out using a high-frequency
induction furnace. The respective alloy samples were prepared.
Then, each of them was subjected to a lost wax method to thereby
obtain a high-temperature investment material. Subsequently, it was
subjected to burning at 900.degree. C. and then subjected to a
high-frequency induction casting furnace, resulting in a test
sample. Each test sample was subjected to abrasive finishing with
JIS R 6253 waterproof abrasive paper (#1000), followed by observing
the surface condition of the sample. As comparative samples,
ornamental materials were prepared under the same conditions as
those described above, except of using the conventional procedures
to provide test samples.
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