JPH07258772A - Gold material for ornament and its production - Google Patents

Abstract

PURPOSE:To produce a gold material having satisfactory mechanical strength, especially hardness in spite of high-grade Au and having ornamental function. CONSTITUTION:A mother alloy contg. one or two kinds of Ca and Si in Au is prepd., melted and cast to obtain the objective Au material consisting of 0.01-1wt.%, in total, of one or two kinds of Ca and Si and the balance Au.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a decorative material used for necklaces, rings, broaches, pendants, tie pins, watch frames, spectacle frames, and the like, and particularly to a high-quality Au material.

[0002]

2. Description of the Related Art Recently, as a material for ornaments, particularly high grade A
The needs of u are increasing. However, high-grade Au, especially pure Au, is weak in terms of mechanical strength, particularly hardness, and there are cases where weak points, that is, flaws, are easily formed or deformed during manufacture or use.

[0003]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides an Au material for ornaments, which has sufficient mechanical strength, especially hardness while maintaining the high quality of Au. To do.

[0004]

The Au material for ornaments of the present invention which solves the above problems is characterized in that one or two kinds of Ca and Si are 0.01 to 1% by weight in total and the balance Au. It is a thing. In addition, the Au material for ornaments of the present invention is produced by forming a master alloy containing one or two kinds of Ca and Si in Au, and then melt-casting the mixture to form one or two kinds of Ca and Si in a total amount of 0.01% by weight. % To 1% by weight and the balance Au.

[0005]

The Au for ornamental article of the present invention constructed as described above
Depending on the material, one or two of Ca and Si in total
Since it contains 0.01 to 1% by weight, the mechanical strength is improved, the hardness is particularly sufficient, and if it is less than 0.01% by weight, the improvement effect cannot be expected, and if it exceeds 1% by weight, the high quality and properties of Au are impaired. . Further, not only one kind but also two kinds have similar improvement effects. Further, since the balance is Au, high quality of Au can be secured. Note that
If it is less than 99.0% by weight, it is difficult to secure high quality, and 99.99% by weight
When it exceeds, the mechanical strength is particularly low. It is presumed that the Au material for decorative articles of the present invention is further improved in mechanical strength because the differences in crystal structure between Au and Ca and Si are closely linked to each other. Also, C
The deoxidizing action of a and Si improves the flow of molten metal during casting, and it is a good material with no material defects such as pinholes. Moreover, since a master alloy containing Ca and Si in Au is made and then melt-cast to a predetermined content, 1% of Ca and Si is required.
A small amount of 0.01% by weight to 1% by weight in total of two or more kinds can be obtained accurately and stably. Particularly, it is even better in melt casting in vacuum.

[0006]

EXAMPLES Examples and conventional examples will be described below. First, as an example, a material containing 4% by weight of Ca and 4% by weight of Si as a master alloy was melt-cast in a high-frequency vacuum melting furnace to obtain a predetermined content of 0.01% by weight, 0.2% by weight, 1% by weight.
Then, a wire material having a wire diameter of 0.5 mm and a wire drawing rate of 90% was used. Also, as a conventional example, the purity is 99.9
% Pure Au (not containing Si or Ca) was melted, cast, and drawn to obtain a wire rod having a wire diameter of 0.5 mm and a working ratio of 90%. However, it was confirmed that, in the examples, the material has a good flow of molten metal during casting, good workability, and good mechanical strength without material defects such as pinholes, as compared with the conventional example. In addition,
As a result of hardness measurement and processing into a necklace, the conventional example had an Hv of 20 to 30, whereas in the example, as shown in Table 1, Hv66 to 157, an extremely hard Au.
It was a material.

[0007]

[Table 1]

Further, as a result of necklace processing, in the conventional example, during manufacturing, handling and use, it was easily damaged and deformed, and the machinability was poor, whereas in the example,
In addition to being hard, they are not easily scratched or deformed when they are manufactured or handled and used, and they have excellent workability such as ductility and malleability and elasticity and good machinability. ,
The glossy finish was also very good.

[0009]

As described above, according to the Au material for ornaments of the present invention, since one or two kinds of Ca and Si are 0.01 to 1% by weight in total and the balance Au, the Au material is of high quality and Mechanical strength It has an excellent effect that it is hard to be scratched and is not easily deformed with a particularly hard material. Further, it also has the effect of being excellent in workability, machinability and abradability in the processing of ornaments.

Claims (4)

[Claims] 1. A total of one kind or two kinds of Ca and Si.
An Au material for ornaments, which is 0.01% by weight to 1% by weight and the balance Au. 2. The Au material for decorative articles according to claim 1, wherein the Au content is 99% by weight to 99.99% by weight. 3. A master alloy containing one or two kinds of Ca and Si in Au is prepared, and then melt-cast to form Ca and Si.
1. The method for producing an Au material for decorative articles, wherein the total amount of one or two kinds is 0.01 wt% to 1 wt% and the balance Au. 4. An Au for ornamental article according to claim 3, wherein a master alloy is prepared and then melt casting is carried out in a vacuum.
Material manufacturing method.