JPH0770672A - Gold ornament material hardened by alloying a small amount of components - Google Patents

Abstract

PURPOSE:To obtain a high hardness gold ornament material while maintaining the golden color tone, high-grade appearance and aesthetic value of pure gold by adding a small amt. of a specified metal to pure gold. CONSTITUTION:One or more among Mg, Al, Si, Mn, Fe, Co, Ni, Cu, Pd, In, Sn, Sb, Pb and Bi are incorporated into pure gold of >=99% purity by 200-2,000ppm to increase the Vickers hardness of the gold to >=100 at which the gold is less liable to abrasion and scratch. This hardness does not lower even after heat treatment by holding at 450 deg.C for 30hr and cooling corresponding to brazing conditions and undergoes no change with the lapse of time.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention has a Vickers hardness (Hv) of 100 or more which is hard to be scratched or scratched, and has a high Vickers hardness even after a lapse of time or after heating such as brazing. The present invention relates to a gold ornament material that retains hardness.

[0002]

2. Description of the Related Art Conventionally, pure gold having a purity of 99% or higher, Ag, Cu, Ni, Pd,
Au alloys having a hardness of Hv: 100 or more are widely used as K14 alloys and K18 alloys by containing alloy components such as Zn and Zn in an amount of 25 to 40% by weight.

[0003]

On the other hand, it is ideal that the above-mentioned ornaments are made of pure gold in terms of color tone and luxury, but pure gold has an Hv of about 32 in an ingot state.
The processed wire has a hardness of about Hv: 80, and even if it is processed and hardened, the hardness not only decreases with the passage of time, but also the hardness cannot be reduced by heating such as brazing. As such, since pure gold ornaments are always in a soft state, they are easily scratched, and it is extremely difficult to maintain a high aesthetic value for a long period of time, and therefore their application is limited to a remarkably narrow range. is there.

[0004]

Therefore, the present inventors have
From the above viewpoint, as a result of conducting research to impart high hardness to the pure gold ornaments without losing the above high aesthetic value, pure gold having a purity of 99% or more, as an alloy component, Mg, Al, S in proportion to the whole
i, Mn, Fe, Co, Ni, Cu, Pd, Ag, I
When one or more of n, Sn, Sb, Pb, and Bi is contained: 200 to 2000 ppm, the hardness is improved to Hv: 100 or more, and this high hardness is maintained with time. Since it is retained even after heating such as brazing, and the content of the above alloy components is small, the color tone and high-grade feeling of pure gold are maintained as they are. Therefore, the resulting gold ornament made of hard gold is a pure gold ornament. We obtained the research result that the high aesthetic value equivalent to the product can be maintained for a long time.

The present invention has been made based on the above-mentioned research results, and Mg, Al, Si, Mn, F is contained in pure gold having a purity of 99% or more in a proportion of the whole.
e, Co, Ni, Cu, Pd, Ag, In, Sn, S
One or more of b, Pb, and Bi (hereinafter, these are collectively referred to as a hardness improving component): 200 to
It is characterized by a gold ornament material made of hard gold that is hardened by containing 2000 ppm.

In the gold decorative material of the present invention, the purity of pure gold is set to 99% or more. When the purity is less than 99%, the golden color tone of pure gold is impaired and the high-grade feeling is lost. The reason is that they will be exposed.
The content of the hardness improving component is set to 200 to 2000 ppm. When the content is less than 200 ppm, the hardness is increased to Hv: 100 or more as described above, and the increased hardness decreases with time. The reason is that the effect of suppressing the decrease due to heating cannot be obtained, and when the content exceeds 2000 ppm, the color tone and high-grade feeling are impaired, and the aesthetic value decreases.

[0007]

EXAMPLES Next, the gold decorative article material of the present invention will be specifically described by way of examples. In a normal vacuum melting furnace, pure gold having the purities shown in Tables 1 and 2 is melted, and alloy components are also contained in the respective contents shown in Tables 1 and 2, and then diameter: 20 mm x length : Casting into a cylindrical ingot having a dimension of 100 mm, cutting a sample from the end of the ingot, and hardness (micro Vickers hardness, load:
100 gr), then chamfered and sent to a single-head wire drawing machine,
Here, 20 passes of wire drawing are repeatedly performed to obtain a diameter:
Pure gold ornament materials 1 to 28 of the present invention and pure gold ornament materials were manufactured under the same conditions except that the alloy components were not included by processing into 0.5 mm wires.

Then, the hardness (micro Vickers hardness, load: 100 gr) of the various decorative materials obtained as a result was measured immediately after wire drawing and after 6 months, and the decoration immediately after wire drawing was performed. With respect to the product material, as usual brazing condition, that is, as a brazing material, for example, melting point: 370 ° C. Au: 3 wt% Si alloy brazing material, melting point: 350 ° C. A
Using a u-12% Ge alloy brazing material or the like, the hardness was measured under the same conditions in which the temperature was maintained at 450 ° C. for 30 minutes and the heat treatment was performed under the conditions corresponding to the cooling brazing conditions. The results of these measurements are shown in Tables 3 and 4.

[0009]

[Table 1]

[0010]

[Table 2]

[0011]

[Table 3]

[0012]

[Table 4]

[0013]

From the results shown in Tables 1 to 4, the gold decorative material materials 1 to 28 of the present invention have a high hardness of Hv: 100 or more, which does not change with time or by heating. It is clear that when the hardness is Hv: 100 or less, the hardness stability is remarkably superior to that of a pure gold decorative material material in which the hardness decreases with time and the hardness decreases remarkably by heating. As described above, the gold decorative material of the present invention has a scratch-resistant Hv: 1.
It has a high hardness of 00 or more, and this high hardness is stable over time and heating, always maintains Hv: 100 or more, and the content of alloy components is small, so the excellent aesthetic value of pure gold It has the same aesthetic value as the above, and has useful properties such as maintaining the aesthetic value for a long period of time in combination with the high hardness.

Claims (1)

[Claims] 1. Pure gold having a purity of 99% or more, and Mg, Al, Si, Mn, Fe, Co, Ni, Cu, P in proportion to the whole.
A gold ornament material characterized by being made of hard gold that is hardened by containing one or more of d, Ag, In, Sn, Sb, Pb, and Bi: 200 to 2000 ppm. .