JPH07258773A - Pt material for ornament and manufacturing method - Google Patents

Abstract

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

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 high-grade Pt material.

[0002]

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

[0003]

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

[0004]

The Pt material for ornaments of the present invention for solving the above-mentioned 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 is Pt. It is a thing. In addition, the Pt material for decorative articles of the present invention is made by forming a master alloy containing one or two kinds of Ca and Si in Pt, and then melt-casting the mixture to form one or two kinds of Ca and Si in a total amount of 0.01 weight. % To 1% by weight and the balance Pt.

[0005]

The Pt for ornaments 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, especially the hardness becomes 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 Pt are impaired. . Further, not only one type but also two types have similar improving effects. Further, since the balance is Pt, high quality of Pt can be secured. If it is less than 99.0% by weight, it is difficult to secure high quality, and if it exceeds 99.99% by weight, the mechanical strength is particularly low. The Pt material for ornaments of the present invention is presumed to further exhibit improvement in mechanical strength because the crystal structures of Pt and Ca and Si are closely and strongly bonded to each other. Also,
Due to the deoxidizing action of Ca and Si, the flow of molten metal at the time of casting is improved, and there are no material defects such as pinholes, etc. Further, since a master alloy containing Ca and Si in Pt is prepared 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 wt% of Ca and 4 wt% of Pt as a master alloy was melt-cast in a high-frequency vacuum melting furnace to obtain a predetermined content of 0.01 wt%, 0.2 wt%, 1 wt%.
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 Pt (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, in the conventional example, the Hv was 110 to 115, whereas in the example, as shown in Table 1, Hv129 to 229 was a very hard Pt 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,
They are all hard, they are not easily scratched or deformed during production or handling and use, and they have good 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 Pt material for decorative articles of the present invention, one or two kinds of Ca and Si are 0.01 to 1% by weight in total and the balance is Pt. 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.
0.01% by weight to 1% by weight and the balance Pt, a Pt material for decorative articles. 2. The Pt material for decorative articles according to claim 1, wherein Pt is 99% by weight to 99.99% by weight. 3. A master alloy containing one or two kinds of Ca and Si in Pt is prepared, and then melt-cast to form Ca and Si.
1. The method for producing a Pt material for a decorative article, characterized in that the total amount of one type or two types is 0.01 wt% to 1 wt% and the balance Pt. 4. The Pt for decorative article according to claim 3, wherein a master alloy is prepared and then melt casting is performed in a vacuum.
Material manufacturing method.