JPH07207383A - Pt-pd material for ornament and its manufacture - Google Patents

Abstract

PURPOSE:To provide the Pt-Pd material without discoloration or the like and its manufacturing method where generation of pin holes and cracks is prevented, and the hardness is improved while the properties of the Pt-Pd alloy is maintained. CONSTITUTION:The Pt-Pd material for the ornament is obtained by mixing 0.01-1wt.% in total of at least one kind of element of Ca, Ti, Zr, Hf and the rare earth metal (especially, Y, Sm, Eu and Er) into the Pt-Pd alloy, especially, 5-20wt.% Pt-Pd alloy. The alloy where at least one kind of element of 0.01-1wt.% in total of Ca, Ti, Zr, Hf and the rare earth metal (especially, Y, Sm, Eu and Er) is added to the Pt, and 5-20wt.% Pd are melted together, and cast to manufacture the Pt-Pd alloy for the ornament.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to Pt-for ornaments such as rings, necklaces, brooches, pendants, tie pins, watch frames, cufflinks, eyeglass frames and earrings.
The present invention relates to a Pd-based material and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, as the above Pt-Pd-based material for ornaments, an alloy composed of Pd 10 to 15 wt% and the balance Pt has been used.
It has been widely used because it has hardness while maintaining the quality of Pt, has a color tone comparable to that of pure Pt, has good processability, and can suppress the price. However, the above Pt
The Pd10 to 15 wt% alloy has a problem that Pd easily absorbs oxygen during casting, so that the oxygen concentration becomes high and pinholes and cracks occur. Further, the hardness was insufficient at Hv 120 to 130, and it was not possible to meet the demand for higher hardness.

Therefore, a Pt-Pd alloy containing 10 to 15 wt% Co is used.
Although Cu and Cu have been added, the addition of Co and Cu causes discoloration of the surface and the like, so that there is a manufacturing inconvenience and restrictions such as requiring surface treatment for finishing.

[0004]

SUMMARY OF THE INVENTION Therefore, according to the present invention, there is no pinhole or crack, and the hardness of Pt-Pd-based material is improved by taking advantage of the characteristics of the Pt-Pd-based material.
An object of the present invention is to provide a Pd-based material and a manufacturing method thereof.

[0005]

A Pt-Pd-based material for ornaments according to the present invention for solving the above-mentioned problems comprises a Pt-Pd-based alloy containing at least 1 of Ca, Ti, Zr, Hf and a rare earth element. It is characterized by containing 0.01 to 1 wt% in total of various kinds of elements. The Pt-Pd alloy is
It is preferable that Pd is 5 to 20 wt% and the balance is Pt. The rare earth element is preferably Y, Sm, Eu or Er. The method for producing a Pt-Pd-based material for ornaments according to the present invention comprises: an alloy in which at least one element of Ca, Ti, Zr, Hf, and a rare earth element is added to Pt in a total amount of 0.01 to 1 wt% and Pd of 5 to 20 wt%. And is melted and cast.

In this manufacturing method, the rare earth element is
Y, Sm, Eu and Er are preferred. In the Pt-Pd-based material for ornaments of the present invention, the Pt-Pd-based alloy contains C
The reason for containing at least one kind of element of a, Ti, Zr, Hf, and rare earth elements in a total amount of 0.01 to 1 wt% is P during casting.
In order to suppress the inhalation of oxygen of d and to reduce the oxygen concentration by performing a deoxidizing action, to prevent the occurrence of pinholes and cracks and to improve the hardness, the effect is obtained if it is less than 0.01 wt%. If it exceeds 1 wt%, the workability will deteriorate.

The above Pt-Pd alloy contains 5 to 20 wt% of Pd,
The reason why the balance is preferably Pt is that when the Pd content is less than 5 wt%, it has the characteristics of the Pt-Pd alloy, that is, it has hardness while maintaining the quality of Pt, and has a color tone comparable to that of pure Pt.
Moreover, the property of good workability cannot be maintained,
This is because if the content exceeds wt%, the quality, color tone, gloss, etc. of Pt as a decorative article will be impaired. The rare earth element is Y, Sm,
The reason why Eu and Er are preferable is that, among the rare earth elements, these elements remarkably suppress the absorption of oxygen in Pd during casting and have an excellent deoxidizing effect.

[0008]

As described above, according to the method for producing a Pt-Pd-based material for decorative articles of the present invention, 0.01 to 1 wt% of Ca, Ti, Zr, Hf and at least one kind of rare earth element is added to Pt in total. Since the alloy and Pd 5-20 wt% are melted and cast,
At the time of casting, at least one element of Ca, Ti, Zr, Hf, and a rare earth element acts to suppress the uptake of oxygen by Pd, and the deoxidizing action is performed to reduce the oxygen concentration, resulting in pinholes and cracks. The occurrence is prevented and the hardness is improved,
It is possible to easily and efficiently manufacture a material for a decorative article, which is free from discoloration and maintains the characteristics of the Pt-Pd alloy.

[0009]

EXAMPLES Explaining the examples of the present invention and the conventional examples in comparison, the decorative material of Examples 1 to 10 and the decorative products of Conventional Examples 1 and 2 having the component compositions shown in the left column of Table 1 below. Examples 1-10 in making a necklace from Pt-Pd alloy for use
Is an alloy of Pt and an additive metal, and Pd are melted in a high-frequency atmospheric melting furnace to form an ingot, and then wire drawing is performed to form a wire rod. In Conventional Examples 1 and 2, Pt and Pd are After melting in a high-frequency atmospheric melting furnace to make an ingot, wire drawing is performed to make wire rods, chain making machines are used to make chains using these wire rods, and necklaces are respectively made from these chains. The results shown in the right column of Table 1 were obtained.

[0010]

[Table 1]

As can be seen from the results shown in the right column of Table 1, the necklaces made of the Pt-Pd-based materials for decorative articles having the component compositions of Examples 1 to 10 have the component compositions of Conventional Examples 1 and 2. The hardness of the necklace was higher than that of the necklace made of the Pt-Pd-based material for ornaments, and was sufficiently satisfactory. In addition, the necklace made of the Pt-Pd-based material for ornaments having the composition of the conventional examples 1 and 2 had some pinholes and cracks at the time of casting even though the color and luster were good. 1 to
The necklace made of the Pt-Pd-based material for ornaments having a composition of 10 had good color and luster, and had almost no pinholes or cracks during casting.

[0012]

As described above, the Pt-Pd-based material for decorative articles of the present invention according to claim 1 is made of Ca, Ti, Zr, H during casting.
f, the rare earth element acts as a deoxidizer and reduces the oxygen concentration, so that the occurrence of pinholes and cracks is prevented. In addition, the hardness becomes high, and discoloration etc. disappears, which is sufficiently satisfactory. Therefore, it is possible to obtain a hard and durable decorative article having a good shape, color and gloss. Further, the Pt-Pd-based material for ornaments of the present invention according to claim 2 can obtain a hard and durable ornament having good shape, color and luster as in the above, while maintaining the characteristics of the Pt-Pd alloy. You can Further, the Pt-Pd-based material for decorative articles of the present invention according to claim 3 has the same effect as described above and is excellent in deoxidizing action during casting.
The occurrence of pinholes and cracks is further prevented. Further, according to the method for producing a Pt-Pd-based material for ornaments of the present invention of claims 4 and 5, Pt for ornaments having the above-mentioned excellent effects.
-A Pd-based material can be manufactured easily and efficiently.

Claims (5)

[Claims] 1. A Pt--Pd alloy containing Ca, Ti, Z
At least one element of r, Hf, and rare earth elements in total
A Pt-Pd-based material for ornaments, which is characterized by containing 0.01 to 1 wt%. 2. A Pt-Pd alloy containing 5 to 20 wt% of Pd,
The balance Pt is composed of the balance Pt.
The Pt-Pd-based material for decorative articles described. 3. The P for ornamental article according to claim 1, wherein the rare earth element is Y, Sm, Eu or Er.
t-Pd type material. 4. An alloy in which at least one element of Ca, Ti, Zr, Hf, and a rare earth element is added to Pt in a total amount of 0.01 to 1 wt% and Pd of 5 to 20 wt% are melted and cast. A method for producing a Pt-Pd-based material for an ornament. 5. The Pt—Pd for decorative article according to claim 4, wherein the rare earth element is Y, Sm, Eu, or Er.
Method for manufacturing base material.