JPH11323461A - White gold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a material excellent in castability and workability and having a white and bright color tone by adding specified amounts of Cu and Zn and one or two kinds among In, Sn and Ga to an alloy essentially consisting of Au and contg. specified amounts of Pt and Pd. SOLUTION: This white gold is obtd. by adding, by weight, 1 to 5% Cu and 0.5 to 5% Zn and one or two kinds among In, Sn and Ga to an alloy essentially consisting of Au and contg. 5 to 15% Pt and 5 to 15% Pd. Pt in the fundamental compsn. of Au-Pt-Pd has effect of improving the darkness of the color tone of Pd as a decoloring element, and it has a color tone whiter and brighter color tone compared to the case of an Au-Ag-Pd alloy. By adding a small amt. of one or two kinds among In, Sn and Ga as well as Cu and Zn to this fundamental compsn., the improvement of the hardness of the stock itself and the increase of the fluidity at the time of casting can be attained without changing the color tone.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to white gold used as a material for processing a plate or wire or a cast material used as a material for rings, necklaces, brooches, ties, eyeglasses and various other decorative articles.

[0002]

2. Description of the Related Art For the purpose of decolorizing the golden color of gold, Ni-based white gold or Pd-based white gold in which Ni or Pd is mainly added to Au is used as a substitute for platinum products.

[0003]

According to the prior art described above, Ni-based white gold has high hardness and excellent spring properties, but is too hard to be suitable for chain processing and work. On the other hand, alloys containing a large amount of Ni have a problem in castability. Furthermore, in recent years, the influence on the human body due to metal allergy has also become a problem.

[0004] On the other hand, Pd-based white gold has good workability and castability to plates and lines, but has a darkness peculiar to the addition of Pd in its color tone.

[0005]

Accordingly, the present invention provides a method for preparing a semiconductor device comprising Au as a main component and containing 5 to 15% of Pt and 5 to 15% of Pd by weight.
1-5% by weight and 0.5-5% by weight of Zn alloy
And one or two of In, Sn, and Ga at 0.1 to 3%
It is characterized by being added. According to the above configuration, Pt in the basic composition of Au-Pt-Pd of the present invention has the effect of improving the darkness of the color tone of Pd, which is a decolorizing element, and is whiter than a conventional Au-Ag-Pd alloy. An alloy composition that exhibits a bright color tone.

[0006] Then, the basic composition includes Cu and Zn and I
By adding a small amount of one or two of n, Sn, and Ga, the hardness of the material itself can be improved and the fluidity at the time of casting can be increased without changing the color tone. Here, the reason for setting Pt to 5 to 15% is that Pd is less than 5%.
This is because there is no effect of improving the darkness of the color tone by the addition, and if it exceeds 15%, yellowness is caused in terms of the color tone.

The reason why Pd is set to 5 to 15% is that if it is less than 5%, the decolorizing effect of Au is small, and if it exceeds 15%, the color tone becomes black. Further, the reason for setting Cu to 1 to 5% is that if less than 1%, improvement in hardness cannot be expected, and if more than 5%, the color tone becomes reddish. 0.5 for Zn
The reason for setting the content to 5% is that if the content is less than 0.5%, improvement in fluidity at the time of casting cannot be expected, and if the content exceeds 5%, workability is adversely affected.

[0008] The reason why the addition amount of one or two of In, Sn, and Ga is set to 0.1 to 3% is that if it is less than 0.1%, it cannot be expected in terms of bright white color and fluidity. 3%
This is because, if it exceeds, the workability will be adversely affected. In addition, the reason why the addition of In, Sn, and Ga is two or less is that when the three kinds are added, the alloy itself becomes brittle due to a synergistic action.

[0009]

Embodiments of the present invention will be described below. Table 1 shows the forms together with the conventional example, and compared the color tone, the hardness of the casting, the castability, and the workability with the conventional example.

[0010]

[Table 1]

Incidentally, the conventional Ni-based white gold has an adverse effect on the human body and is rarely used at present, so only Pd-based white gold is used. Among these, color tone, hardness of cast body, castability, lost wax casting using a high frequency suction type precision casting machine, after polishing and finishing the product, the color tone by visual inspection, the hardness of the product surface Was measured with a Vickers hardness tester, and the castability was determined by judging the appearance and the state of the nest in the cross section.

Regarding the workability, 1
100 g of a sample is 5 mm thick, 20 mm wide and about 50 m high
m, and rolled after annealing at 700 ° C. to compare the workability.

[0013]

According to the present invention described in detail above, A
u as a main component, Pt5 to 15% by weight, Pd5 to 1
Cu 1-5%, Zn 0.5- by weight ratio to alloy containing 5%
5% and one or two of In, Sn, and Ga are 0.1 to
By adding 3%, there is an effect that white gold with a white and bright color excellent in castability and workability can be provided.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Takanori Nishihara, inventor 11-17 Kugahoncho, Fushimi-ku, Kyoto-shi, Kyoto

Claims (1)

[Claims] 1. A composition containing Au as a main component and a Pt of 5 to 1 in weight ratio.
5%, Pd5 to 15% alloy containing Cu1-5 by weight ratio
%, Zn 0.5 to 5%, and 0.1 to 3% of one or two of In, Sn, and Ga are added.