JPH07242963A - Metal fastening member for pure gold ornament - Google Patents

Abstract

PURPOSE:To improve the spring properties of various metal fastenings used for ornaments by incorporating trace amounts of Ca, Y, La and Ce into pure gold. CONSTITUTION:Pure gold having >=99wt.% purity is incorporated with Ca by 200 to 2000ppm in the ratio occupying in the whole body. Moreover, by a comps. contg. 10 to 1000ppm of one or >= two kinds among Y, La and Ce, a metal fastening member of a fastening for a pure gold ornament or the like is formed. The reason for regulating the purity of pure gold to >=99% is that, in the case of <99% purity, the tone of the gold color of pure gold is deteriorated and its appearance seemingly high-ranking is lost. It is unfavorble to regulates the content of Ca to <200ppm because the spring properties required as those of a metal fastening member can not be obtd. and to regulate the content to >2000ppm because otherwise a slight cloud generates on the color tone and the further improvement of the spring properties can not be obtd. It is unfavorable to regulate the contents of Y, La and Ce to <10ppm because otherwise the required spring properties can not be obtd. and to regulate those to >1000ppm because otherwise its color tone is deteriorated and the further improvement of the spring properties can not be obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal fitting member for a pure gold decorative article having excellent spring properties, which is used as various metal fittings for a pure gold decorative article such as a stopper for a pure gold necklace or a bracelet, a retaining pin for a pure gold brooch, etc. Is.

[0002]

2. Description of the Related Art Conventionally, to produce gold ornaments such as necklaces, bracelets, and broaches, pure gold has to be made of Ag and C.
K containing 25 to 40% of u, Ni, Pd, Zn, etc.
14 gold alloy and K18 gold alloy are used. But,
In recent years, necklaces, bracelets, and broaches made of pure gold have been put on the market as pure gold ornaments.

[0003]

However, various metal fittings such as a stopper for connecting a necklace or a bracelet of these pure gold ornaments or a pin for fixing a brooch to clothes have a purity of 99% by weight or more as usual. Since pure gold lacks the spring property, only the metal fittings such as the stopper plate had to be made of other metal or alloy having excellent spring property. However, the purchaser mistakenly thinks that the ornaments sold as pure gold ornaments are made of pure gold having a purity of 99% by weight or more, including the metal fittings of the ornaments. For that reason, it is necessary to explain at the time of sale that only the clasp metal part is made of another metal or alloy, and there is a fear that it may be an incorrect label.

[0004]

Therefore, the present inventors have
From this point of view, as a result of conducting research to use pure gold for metal fittings such as stoppers of pure gold ornaments, the ratio of pure gold having a purity of 99% by weight or more to Ca: 200
~ 2000ppm, Y, La, Ce
It has been found that pure gold having a composition containing 10 to 1000 ppm of one kind or two or more kinds among them has a significantly improved spring property and can be sufficiently used as a clasp metal member of a pure gold ornament. I got it.

The present invention has been made on the basis of such knowledge, and in pure gold having a purity of 99% by weight or more, the ratio of Ca: 200 to 2000 pp in the total amount.
A metal fitting member of a pure gold ornament containing m, and further containing one or more of Y, La, and Ce in an amount of 10 to 1000 ppm, and a clasp made of the metal fitting member. It is a thing.

In the metal fitting member of the pure gold ornament of the present invention, the purity of the pure gold is set to 99% by weight or more. When the purity is less than 99% by weight, the golden color tone of the pure gold is impaired, and the feeling of luxury is high. Is lost. If the content of Ca is less than 200 ppm, the spring property required for metal fittings such as a clasp cannot be obtained. On the other hand, if the content of Ca exceeds 2000 ppm, the color tone is slightly clouded and the spring content is further improved. It is not preferable because improvement of the property cannot be obtained. Therefore, the Ca content is defined as 200 ppm to 2000 ppm as a proportion of the whole.
A more preferable range is 800 to 1800 ppm,
An even more preferable range is 1000 to 1600 ppm
Is.

Further, the content of one or more of Y, La and Ce in the whole is 10 to 1000.
The limit to ppm is that if the content of these is less than 10 ppm, the desired springiness cannot be obtained, while 1000 ppm
If it is contained in an amount exceeding the above range, the color tone is deteriorated and the spring property cannot be further improved, such being undesirable. Therefore, Y, L
The content of one or more of a and Ce is 10 p
It was set to pm to 1000 ppm. A more preferable range is
It is 100 to 500 ppm, and an even more preferable range is 200 to 300 ppm.

[0008]

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. The pure gold melt obtained by adding a trace amount in the ratio shown in 2 was cast and the width was 65 mm, the length was 150 mm, and the thickness was 1
An ingot having a size of 8 mm was produced. These pure gold ingots were cold-rolled to a thickness of 0.5 mm and a width of 10
mm, length: 150 mm was cut out into a thin plate shape, and metal fitting members 1 to 16 of the present invention, comparative metal fitting members 1 to 5 and conventional pure gold members were produced. The spring limit values (Kb values) of these metal fitting members 1 to 16 of the present invention, comparative metal fitting members 1 to 5 and conventional pure gold members were repeatedly measured with a deflection tester, and the results are shown in Tables 1 and 2.

[0009]

[Table 1]

[0010]

[Table 2]

From the results shown in Tables 1 and 2, since the metal fitting members 1 to 16 of the present invention all have a spring limit value far superior to the conventional pure gold members, they are sufficient as stoppers for pure gold ornaments. You can see that it can be used for. However, Ca and one or two of Y, La, and Ce
The comparative metal fitting members 2 to 5, which contain a large amount of more than one kind outside the scope of the present invention, lose the luster of pure gold to cause fog, and like the comparative metal fitting member 1, are included less than the scope of the present invention. It is also understood that it is not preferable because sufficient springiness cannot be obtained.

[0012]

As described above, the metal fitting member of the present invention is
It can be put to practical use as a stopper for pure gold ornaments,
It is possible to provide an all-gold ornament that has never been seen before, which promotes purchasing and brings excellent effects to the ornament industry.

Claims (2)

[Claims] 1. Pure gold having a purity of 99% by weight or more,
% Of total Ca: 200-2000ppm
In addition, 10 to 1 of 1 or 2 or more of Y, La and Ce is further contained.
A metal fitting member for a pure gold ornament, which has a composition containing 000 ppm. 2. Pure gold having a purity of 99% by weight or more,
% Of total Ca: 200-2000ppm
In addition, 10 to 1 of 1 or 2 or more of Y, La and Ce is further contained.
A stopper for a pure gold ornament, which has a composition containing 000 ppm.