JP2848885B2 - Jewelry composite materials - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a noble metal composite material having a color pattern suitable for use in jewelry materials and accessories.

[Conventional technology]

Jewelry items such as pendants, brooches, earrings, rings, ties, and eyeglass frames, and so-called combi materials in which Au alloys with different colors are combined with Pt or Pt alloy are used in some accessories.

For these colors, the Au-Cu alloy system is pink to red, the Au-Ag alloy system is green to yellow, the Au-Ag-Cu system is yellow, and the Pt and Pt alloys are white. We manufacture materials with color patterns by brazing and combining them by the inlaid method or the diffusion cladding method.

[Problems to be solved by the invention]

According to the combination of Pt and the combination of the Pt alloy and the Au alloy as described above, there is a problem that the range of the color tone is limited, and a high level of manufacturing technology is required. Therefore, there is a demand for a precious metal having an unprecedented color tone that can be mass-produced.

[Means for solving the problem]

The present invention combines Pt or a Pt alloy with an Au-Fe alloy obtained by adding 10 to 30 Wt% of Fe to Au, and after processing into a predetermined shape, at a temperature of 200 to 450 ° C. in an atmosphere containing oxygen. Heat, Au-
The color tone of Pt or Pt alloy is made to appear by changing the color tone of Fe alloy.

The reason why the amount of Fe added to the Au-Fe alloy is limited to 10 to 30 Wt% is that the addition of Fe less than 10 Wt% does not provide a desired change in color tone in the subsequent heat treatment. This is because, as a jewelry material, corrosion resistance and discoloration resistance deteriorate.

The heating temperature in an atmosphere containing oxygen
In the treatment at a temperature lower than 200 ° C, no change in color tone was observed.
If the temperature is higher than 50 ° C., the composite Pt alloy may be deformed due to softening.

〔Example〕

 Hereinafter, embodiments of the present invention will be described.

First Example 90Au-Fe as a base material was melted by vacuum melting, and cutting, rolling and bright annealing were repeated to produce a plate having a thickness of 5 mm, a width of 50 mm and a length of 100 mm. Six grooves were cut at 4 mm intervals.

Next, Pt to be a coating material is dissolved by vacuum melting,
Wire was drawn using a modified soybean to produce R2 Komaru wire.

The above instep wire was fitted into a groove of the base material, joined by hot pressing at 700 ° C., processed into a plate having a thickness of 1 mm, and processed into a pendant head. Furthermore, by treating this in an atmosphere containing oxygen at 300 ° C. for 30 minutes, only the 90Au—Fe alloy became light blue in color and a beautiful pendant having a white band was obtained.

Second Example 90Pt-8Pd-2Cu serving as a base material was melt-cut by vacuum melting, and after rolling, a plate material having a thickness of 10 mm, a width of 60 mm, and a length of 100 mm was manufactured.

Next, the coating material 80Au-Fe was melt-cut by vacuum melting, rolling, bright annealing repeated, thickness 1 mm, width 60 m
A material having a length of 100 mm and a length of 100 mm was manufactured, and joined together by hot pressing at 700 ° C. together with the Pt alloy as the base material.

Rolling this joint material, repeating bright annealing, thickness 1mm
After processing into a tie bar with a width of 7 mm and a length of 50 mm, engrave a diamond cut pattern at a depth of 0.2 mm from the Au-Fe alloy side, and treat at 270 ° C for 30 minutes in an atmosphere containing oxygen. As a result, only the Au-Fe alloy became purple-red, and a tie bar harmonized with the white color of the underlying Pt alloy was obtained.

Third Example 80Pt-10Pd-5Cu serving as a base material was melted by vacuum melting, and after rolling, rolling and bright annealing were repeated to a thickness of 5 mm and a width of 40 m.
A plate having a length of 100 mm and a length of 100 mm was manufactured, and a groove having a depth of 1 mm and a width of 20 mm was cut at the center of one surface of the plate.

Next, using a coating material 70Au-Fe melted by vacuum melting, rolling after cutting, repeating bright annealing, thickness 1m
m, a plate having a width of 20 mm was manufactured.

The above-mentioned plate material was fitted in a groove of the base material, hot-pressed at 750 ° C. and joined, and processed to a thickness of 0.5 mm.

An earring part was manufactured from this plate material by pressing. By treating this at 450 ° C. in an atmosphere containing oxygen, the 70Au—Fe alloy became beautiful gray and a two-tone earring of the base metal Pt alloy was obtained.

〔The invention's effect〕

According to the present invention described in detail above, a composite of Pt or a Pt alloy and Au-Fe obtained by adding 10 to 30 Wt% of Fe to Au,
After processing into the prescribed shape, 200-450 ° C in an atmosphere containing oxygen
The color tone obtained by heat-treating the white Pt or Pt alloy and the Au-Fe alloy by heating at a temperature of and changing the color tone of the Au-Fe alloy to reveal a color pattern with Pt or a Pt alloy. Has an effect that a noble metal composite material having a color pattern with excellent aesthetics can be mass-produced.

Claims (1)

(57) [Claims] 1. A composite of Pt or a Pt alloy and an Au-Fe alloy obtained by adding 10 to 30 Wt% of Fe to Au, and after processing into a predetermined shape, a temperature of 200 to 450 ° C. in an atmosphere containing oxygen. And heat with Au-
A composite material for jewelry, wherein the color tone of the Fe alloy is changed to produce a color pattern with Pt or a Pt alloy.