JPH10309204A - Compound member using gold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a compound member consisting of gold and a gold alloy be harder than pure gold, have high quality feeling and color similar to pure gold and to enable to be used for decoration with high quality, by making the gold have a gold purity higher than a specific value, the gold alloy have Co and Ge contents higher than specific weight % respectively, and have the total content of Co and Ge lower than a specific weight %. SOLUTION: High purity gold with gold purity higher than 99.9 wt.%, and a gold alloy with Co content higher than 0.06 wt.%, Ge content higher than 0.03 wt.%, and the total content of Co and Ge lower than 1wt.% are used for this compound member. Co, Ni, and Ge are added to harden soft pure gold. When the content of Co and/or Ni is lower than 0.06 wt.%, sufficient hardening effect can not be obtained. The hardening effect is also not sufficient by Ge lower than 0.03 wt.%. When the total content of Co and/or Ni and Ge surpasses 1 wt.%, tough the compound member is hardened, the gold purity is lowered. A higher hardness and higher gold quality are obtained by compounding gold and a gold alloy.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite member using gold which is used for ornaments such as rings, necklaces, earrings, watches and the like. The present invention relates to a composite member made of gold and a gold alloy, which has enhanced hardness without losing beauty, weight, and luxury.

[0002]

2. Description of the Related Art High quality gold alloys are soft. For this reason, high-grade gold ornaments are easily damaged during processing and use, and it has been difficult to maintain the original luxury. For example, a pure gold ingot has a micro Vickers hardness HV of about 30.

[0003] Gold ornaments such as rings and necklaces contain silver (Ag), copper (Cu) or the like in an amount of 25 to 40% by weight.
So-called 18K or 14K which was added and cured was used.

[0004]

However, the so-called 18
K, 14K, etc., compared to pure gold, its luster, metal color,
The beauty, weight, and luxury were inferior.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a composite member which is harder than conventional pure gold, has a high-grade appearance and color tone equivalent to that of pure gold, is high quality, and is used for decoration.

[0006]

According to the present invention, there is provided a composite member comprising gold and a gold alloy, wherein the gold has a high purity of 99.9% by weight or more. Gold, and the gold alloy contains 0.0% of Co and / or Ni.
6% by weight or more, Ge is 0.03% by weight or more, and C
It is a gold alloy having a total content of o and / or Ni and Ge of 1% by weight or less.

[0007] In the present invention, the gold alloy portion has high hardness. The decorative article only needs to use a hard material only on its surface, and does not require high hardness on the entire surface. Parts that need to maintain a glossy surface in design,
A high-hardness member may be used only in a portion that easily contacts the outside when used. By using a high-hardness gold alloy only in necessary parts as described above, the average gold purity of the composite material can be 99.9% by weight or more.

[0008]

DETAILED DESCRIPTION OF THE INVENTION Co, N in the gold alloy of the present invention
i and Ge are added to harden soft pure gold. The gold alloy is hardened by the synergistic effect of the addition of these components.

0.06% by weight of Co and / or Ni
If it is less than the above, the curing effect cannot be sufficiently obtained. If Ge is less than 0.03% by weight, the effect of curing cannot be sufficiently obtained. Further, when the total content of Co and / or Ni and Ge exceeds 1% by weight, the composite material is cured, but the gold purity of the composite material is reduced.

[0010] By combining gold and a gold alloy, higher hardness and higher gold quality can be obtained. For example, in a metal tube for a ring, a gold alloy is used for the outer surface and gold is used for the inner surface.

Various manufacturing methods can be applied to the production of the composite member. For example, when gold and a gold alloy are plate materials, they can be clad. In the case of casting, a cast-in method, centrifugal casting or the like can be applied.

The thickness ratio or weight ratio between gold and gold alloy is arbitrary. When high quality is required for the member, the ratio of the gold alloy may be reduced and the thickness of the gold alloy layer may be reduced. On the other hand, when high strength is desired, the content of the additive in the gold alloy may be increased or the thickness of the gold alloy layer may be increased. For example, by setting the wall thickness ratio between gold and a 0.5% -concentration gold alloy to 4: 1, the gold quality becomes 9%.
A composite component of 9.9% by weight is obtained.

The gold-based composite member of the present invention becomes even harder by aging. It is considered that the aging treatment becomes harder as the temperature is lower. However, the aging treatment at a lower temperature requires a longer time to obtain a constant hardness, which is not preferable in production. When the temperature of the aging treatment is 200 ° C. or more, the aging treatment time can be shortened. At a temperature higher than 500 ° C., it is difficult to obtain age hardening.
0 ° C. or lower is preferred.

In case of a large cast product, the solution hardening treatment can sufficiently exert age hardening. The solution heat treatment is performed at a temperature at which the solute element forms a solid solution in the gold alloy, but is generally 700 to 800 ° C. In this case, if held at a high temperature for a long time, the solute elements diffuse to the gold side,
Since the age hardening ability of the gold alloy is reduced, the time is preferably set to 60 minutes or less.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Au-Co-based Au-Ni containing 1% by weight of Co, Ni or Ge in a high-frequency vacuum melting furnace
And Au-Ge based mother alloys were produced. These master alloys and pure gold (purity 99.99%) were used as raw materials, blended to have a predetermined composition, and further melted and cast in a high-frequency vacuum melting furnace to produce a gold alloy having the composition shown in Table 1.

The ingot of these gold alloys is rolled and
板 2 mm thick plate. A separately prepared pure metal plate was stacked and rolled to obtain a 5 mm-thick plate material having a (gold alloy / composite member) ratio (shown as “alloy ratio” in the table) of 18 to 40% by weight, and further rolled. This was subjected to a solution treatment at 750 ° C. for 30 minutes and then an aging treatment at 350 ° C. for 40 minutes. The hardness of each sample at each aging time was measured with a micro Vickers hardness and a load of 200 gf. Purity 99.99% by weight
Table 1 shows the results together with the hardness of the pure gold.

[0017]

[Table 1]

From Table 1, it can be seen that the composite member of the present invention has a significantly higher surface hardness after aging treatment than the high-purity gold of Comparative Example 1 (purity 99.99% by weight), and all have a gold grade of 99.9.
% And higher. On the other hand, Comparative Examples 2 to 5 show the same hardness as the example, but the gold quality is as low as 99.8% or less.

It should be noted that the composite member of the present invention has gloss, metallic color, beauty, weight, luxury, etc. which are not different from those of pure gold.

[0020]

The composite member using gold according to the present invention is harder than pure gold, so that it is hard to be scratched, has the same quality as pure gold, and has characteristics that do not impair luxury and color tone.

Claims (3)

[Claims] 1. A composite member comprising gold and a gold alloy, wherein the gold is high-purity gold having a gold purity of 99.9% by weight or more, and the gold alloy contains 0.06% by weight or more of Co, A composite member comprising a gold alloy having a Ge content of 0.03% by weight or more and a total content of Co and Ge of 1% by weight or less. 2. A composite member comprising gold and a gold alloy, wherein the gold is high-purity gold having a gold purity of 99.9% by weight or more, and the gold alloy contains 0.06% by weight or more of Ni; A composite member characterized by being a gold alloy having a Ge content of 0.03% by weight or more and a total content of Ni and Ge of 1% by weight or less. 3. A composite member comprising gold and a gold alloy, wherein the gold is high-purity gold having a gold purity of 99.9% by weight or more, and the gold alloy contains 0.06% of Ni and Co in total. A composite member characterized by being a gold alloy having a total content of Ni, Co, and Ge of not more than 1% by weight, and not less than 0.03% by weight of Ge and 0.03% by weight of Ge.