JPH07265112A - Gold decorative member and gold fitting member - Google Patents

Abstract

PURPOSE:To provide the gold decorative member provided with a component composition within a range normally called pure gold to be used for manufacturing necklaces, bracelets or brooches and the metal fitting member equipped with component composition within a range normally called pure gold having strength and flexibility to be used for manufacturing the gold fittings of necklaces or bracelets, or the fitting pins of brooches. CONSTITUTION:The gold decorative member and the gold fitting member are obtained by incorporating 500 to 2000ppm of C and 1 to 50ppm of Ca in pure gold of purity of >=99wt.%.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gold ornament material having a component composition within a range generally called pure gold, which can be used for manufacturing necklaces, bracelets, broaches, etc. The present invention relates to a metal fitting member having a component composition within the range generally called pure gold, which has strength and spring properties and can be used for manufacturing a bracelet clasp, a brooch retaining pin, and the like.

[0002]

2. Description of the Related Art Conventionally, pure gold cannot be obtained with sufficient strength and hardness to manufacture gold ornaments such as necklaces, bracelets, broaches.
A K14 gold alloy or a K18 gold alloy containing 25 to 40% of g, Cu, Ni, Pd, Zn, etc. is used.

[0003]

However, it is ideal that the ornaments are made of pure gold in terms of color tone and high quality, but pure gold is about Hv: 32 in the ingot state and Hv: in the processed wire. It has a hardness of only about 80, and even if it is hardened by work, its hardness not only decreases with the passage of time, but it also cannot be avoided by heating such as brazing. Since it was always in a soft state, it was easily scratched, and it was extremely difficult to maintain a high aesthetic value for a long time.

In recent years, necklaces, bracelets,
We sell gold ornaments such as brooches as pure gold ornaments,
Although we are trying to promote purchasing motivation, metal fittings such as pins for connecting these necklaces and bracelets or pins that hold brooches to clothes etc. are insufficient in strength and springiness with pure gold. Only a part is a gold alloy with excellent strength and springiness, for example, K18
I had to make it with gold alloy, K14 gold alloy, etc. However, the buyer who sells the ornaments sold as pure gold ornaments is made of gold alloy, which is usually called pure gold, which has a purity of 99% by weight or more, including the metal fittings of the ornaments. It was mistakenly purchased as a purchase, and for that reason, it must be explained at the time of sale that only the stopper metal part is made of gold alloy such as K18 gold alloy, K14 gold alloy, etc. there were.

[0005]

Therefore, the present inventors have
From this point of view, as a result of conducting research to manufacture metal fittings such as gold ornaments and clasps with a gold alloy having a component composition within a range usually called pure gold, as a result, pure gold having a purity of 99% by weight or more was obtained. Of Ca: 500 to 200
A gold alloy having a composition containing 0 ppm and further containing C: 1 to 50 ppm has almost the same color tone as pure gold, and further has excellent strength and spring property, and is a metal fitting member such as a gold ornament material and a clasp. As a result, they have obtained the knowledge that they can be fully used.

The present invention has been made on the basis of such findings, and in pure gold having a purity of 99% by weight or more, the ratio of Ca: 500 to 2000 pp in the whole.
m and C: a gold decorative material and a metal fitting member having a composition containing 1 to 50 ppm.

In the gold ornamental material and the metal fitting member of the present invention, the purity of pure gold is set to 99% by weight or more. When the purity is less than 99% by weight, the golden color tone of pure gold is impaired and the high-grade It is because the feeling is lost. Further, if the content of Ca is less than 500 ppm as a proportion of the whole, it is not sufficiently cured, and the strength and spring properties required for gold ornamental materials and metal fittings cannot be obtained.
When the content exceeds pm, the color tone is slightly clouded, and further strength and springiness cannot be obtained, which is not preferable.
Therefore, the Ca content is 50% of the whole.
It was set to 0 ppm to 2000 ppm. A more preferred range is 800 to 1800 ppm, and an even more preferred range is 1000 to 1600 ppm.

Further, the content of C is 1 in the whole ratio.
Limited to ~ 50 ppm, these contents are 1 pp
If it is less than m, desired strength and springiness cannot be obtained, while
Even if the content exceeds 50 ppm, further strength and springiness cannot be obtained, which is not preferable. Therefore, the content of C is set to 1 ppm to 50 ppm. A more preferred range is 5 to 40 ppm, and an even more preferred range is 10 to 30 ppm.

[0009]

EXAMPLES Pure gold having the purities shown in Tables 1 and 2 was melted in a normal vacuum melting furnace, and the components shown in Tables 1 and 2 were added to the pure gold molten metal in proportions to the whole. A small amount was added at the ratio shown in 2, and the obtained pure gold molten metal was cast to produce a cylindrical ingot having a diameter of 20 mm and a length of 100 mm. Test pieces were cut out from the ends of these cylindrical ingots to measure the hardness (micro Vickers hardness, load: 100 gr), then chamfered and sent to a single-head wire drawing machine, where 20 passes were repeated. Then, the gold members 1 to 15 of the present invention, the comparative gold members 1 to 4 and the conventional pure gold member were produced by processing into a wire having a diameter of 0.5 mm.

The hardness (micro Vickers hardness, load: 100 gr) of each of the present gold members 1 to 15, comparative gold members 1 to 4 and conventional pure gold members was measured immediately after wire drawing and after 6 months. Further, after subjecting the gold members 1 to 15 of the present invention, the comparative gold members 1 to 4 and the conventional pure gold member immediately after wire drawing to heat treatment under the same conditions as brazing for cooling after holding at 450 ° C. for 30 minutes. The hardness was measured, and the results are shown in Tables 1 and 2.

Further, the gold members 1 to 1 of the present invention immediately after wire drawing
15, tensile strength of the comparative gold members 1 to 4 and the conventional pure gold member were measured by a tensile tester, and a spring limit value (Kb value) was measured by a repeated flexure tester, and the results are shown in Table 1 and The results are shown in Table 2.

[0012]

[Table 1]

[0013]

[Table 2]

From the results shown in Tables 1 and 2, all of the gold members 1 to 15 of the present invention have a high hardness of Hv: 100 or more, which does not change with time or by heating, as compared with the conventional pure gold members. Since it has an excellent tensile strength and a spring limit value, it can be seen that it can be sufficiently used as a metal member such as a gold ornament material and a clasp. However, it is also understood that the comparative gold members 1 to 4 in which Ca and C are included outside the scope of the present invention have unfavorable characteristics.

[0015]

As described above, since the ornamental material and metal fitting member of the present invention have a component composition within the range generally called pure gold, the ornamental material and metal fitting member of the present invention are used to make all pure gold. It is possible to manufacture ornaments made of gold, promote the sale of ornaments made of pure gold, and bring excellent effects to the ornament industry.

Claims (2)

[Claims] 1. Pure gold having a purity of 99% by weight or more,
A gold decorative material characterized by having a composition containing Ca: 500 to 2000 ppm and C: 1 to 50 ppm in proportion to the whole. 2. Pure gold having a purity of 99% by weight or more,
A metal fitting member having a composition containing Ca: 500 to 2000 ppm and C: 1 to 50 ppm in proportion to the whole.