JPH03202455A - Combined material for precious ornament - Google Patents

Abstract

PURPOSE:To obtain a combined material for precious ornament having color patterns excellent in aesthetic characteristic by combining Pt or Pt alloy, Au alloy, and Au-Fe alloy, working the resulting combined material into the prescribed shape, and then carrying out heating in an O2-containing atmosphere. CONSTITUTION:For example, a metal plate is prepared by using an Au alloy to be a base material, and plural grooves are formed at prescribed spaces in the surface on one side of this metal plate by means of machining. Subsequently, a stock composed of an Au-Fe alloy to be an intermediate layer is prepared. Then, a stock composed of a K12-22Au alloy (containing 50-91.7wt.% Au) to be a coating material is prepared. The base material, the intermediate layer, and the coating material mentioned above are joined by means of hot rolling. The resulting joined material is worked into the prescribed shape and heated up to 200-450 deg.C in an O2-containing atmosphere. By this method, the hue of the Au-Fe alloy as the intermediate layer is changed and color patterns together with the Pt or Pt alloy and the K12-22Au alloy can be allowed to appear, by which the combined material for precious ornament having the above characteristic can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a composite material of precious metals having a color pattern suitable for use in jewelry materials and accessories.

[Prior art] So-called combination materials, which are a combination of Au alloys of different colors and Pt or Pt gold alloys, are used in some jewelry and accessories such as pendants, brooches, earrings, rings, tie holders, and eyeglass frames. .

These colors are tinkle red for the Au-Cu alloy, green to yellow for the Au-Ag alloy, and green to yellow for the Au-Ag alloy.
The U-type material is yellowish in color, and is produced by combining white Pt or Pt-gold alloys by brazing and using the inlay method or diffusion cladding method to produce a material with a color pattern.

[Problem to be solved by the invention]

The combination of Pt, Pt-gold alloy and Au alloy as described above has the problem that the range of color tones is limited and that advanced manufacturing technology is required. Therefore, there is a need for something that is made of precious metals, has an unprecedented color tone, and can be mass-produced.

[Means to solve problems]

The present invention is based on Pt or Pt gold alloy, K12 to K22.
(A composite of an Au alloy containing 50 to 91.7 Wt and an Au-Fe alloy containing 8 U and 10 to 30 Wt
It is characterized in that it is heated at a temperature of 00 to 450° C. to change the color tone of the Au-Pe alloy, thereby creating a color pattern of Pt or Pt gold alloy with an Au alloy of 12 to K22.

In addition, the amount of Pe added to the Au-Fe alloy is 10 to 30 Wtz.
The reason for this limitation is that if less than 30 WtX is added, the desired color change cannot be obtained in the subsequent heat treatment, and if more than 30 WtX is added,
This is because corrosion resistance and discoloration resistance deteriorate.

Also, regarding the heating temperature in an oxygen-containing atmosphere, 2.
When treated at temperatures below 00°C, no change in color tone was observed,
This is because at a temperature of 450° C. or higher, there is a risk that the gold alloys Nos. 2 to 22 will be discolored or deformed due to softening.

〔Example〕

The present invention will be explained in detail below.

1st Example 90Au-Fe, which is the base material, is melted by vacuum melting,
After cutting, rolling and bright annealing were repeated to produce a plate with a thickness of 5-1 1l, a width of 50 mm, and a length of 100+++a, and six R2 grooves were cut at four groove intervals on one side of the plate.

Next, the Pt that will become the coating material is vacuum melted and yellow 91
．． 7Au-5Ag-3,3Cu was melted in a Tammann furnace and drawn using a deformed die to produce an R2 round wire.

Each of the above-mentioned round wires was fitted alternately into the grooves of the base material, and they were joined by hot pressure bonding at 700"C, and processed into a plate with a thickness of III to form a pendant head.Furthermore, this was heated at 300"C.
By processing in an atmosphere containing oxygen for 30 minutes,
Only the 90Au-Fe alloy has a light blue color tone, and P
A beautiful pendant with a white band of T and a yellow band of Au alloy was obtained.

2nd Example 90Pt-Pd, which is the base material, is melt-cut by vacuum melting, and after rolling, the thickness is 10~10cm, the width is 60m+s, and the length is 100m.
m plates were manufactured.

Next, the 80Au-Fe alloy that will become the intermediate layer is melt-cut by vacuum melting, rolled and brightly annealed repeatedly to a thickness of 1
A material of 11Ill, width 60m5 and length 100+wm was produced.

Next, 75Au-12,5Ag-12,5 which becomes the coating material
Cu is melted in a Tamman furnace, thickness III, width 60m.
5. A material with a length of 100 mm was manufactured.

The base material, intermediate layer, and covering material were combined and bonded by hot pressing at 700'C.

This bonding material was randomly cut to a depth of 1Nll11 to 311111cm, then rolled and bright annealed repeatedly to form a plate with a thickness of 1-1. After that, it was processed into a tie bar with a width of 7ms and a length of 50m, and then heated at 270℃. By processing in an oxygen-containing atmosphere for 30 minutes, only the 80Au-Fe alloy became purple-red, and a wood-grained tie bar consisting of the yellow of the Au alloy and the white of the base material was obtained.

3rd Example 80Pt-10Pd-5Cu, which becomes the base material, was melted by vacuum melting, and after cutting, rolling and bright annealing were repeated to obtain a thickness of 5.
A plate with a width of 40n+m and a length of 100+wm was manufactured, and a groove of 11111 in depth and 2 in width was cut on one side of the plate.

Next, using a 70Au-Fe alloy as a coating material, it was melted by vacuum melting, and after cutting, rolling and bright annealing were repeated.
A plate material having a thickness of 111111 mm and a width of 2 II11 mm was manufactured.

In addition, 50Au-40Cu-8 is another coating material.
After melting Ag-2Ni pink gold in a Tanman furnace,
A square wire with a thickness of 111111 mm and a width of 211111 mm was manufactured.

Each of the above-mentioned covering materials was fitted into the groove of the base material, hot-pressed at 750° C. to join them, and processed to a thickness of 0.5 mm.

Earring parts were manufactured from this plate material by pressing. By treating this material at 450°C in an oxygen-containing atmosphere, 85Au was deposited on a white Pt alloy substrate.
Earrings with a beautiful gray band pattern made of -Fe alloy and pink band pattern made of Au alloy were obtained.

[Effect of the invention] According to the present invention described in detail above, Pt or Pt
Gold alloy, K12~K22 Au alloy and further 10 to Au
~30WtW of Fe-added Au-Fe alloy is composited, processed into a predetermined shape, and then heated in an oxygen-containing atmosphere for 2
White Pt or Pt gold is produced by heating at a temperature of 00 to 450°C to change the color tone of the Au-Fe alloy and make a color pattern of Pt or Pt alloy and Au alloy of 12 to K22 appear. The combination of the color tone of the Au alloy material and the color tone obtained by heat-treating the Au-Fe alloy has the effect of making it possible to mass-produce a noble metal composite material having a color pattern with excellent aesthetics.

Moreover, it has a design effect that is rich in beautiful changes compared to materials with color patterns.

Claims (1)

[Claims] 1. Pt or Pt alloy and K12 to K22 (Au5
0 ~ 91.7 Wt%) Au alloy and further 10 ~
It is composited with an Au-Fe alloy containing 30 wt% of Fe, and after being processed into a predetermined shape, it is heated in an oxygen-containing atmosphere for 200~
A composite material for jewelry, characterized in that the color tone of the Au-Fe alloy is changed by heating at a temperature of 450°C to reveal a color pattern of Pt or a Pt alloy and an Au alloy of K12 to K22.