JPH07207384A - Ag or agcu alloy for ornament to be brazed - Google Patents

Abstract

PURPOSE:To provide a material for the ornament to be brazed which is of high quality, difficult to be softened, and excellent in the mechanical strength, especially in the hardness by specifying the composition consisting of Si, Ti, Zr, Hf, the rare earth metal, and Ag or AgCu alloy. CONSTITUTION:The Ag or AgCu alloy for the ornament to be brazed has the composition consisting of at least one kind of Si, Ti, Zr, Hf and the rare earth metal, with 0.01-1wt.% in total, and the balance Ag or AgCu alloy, and is difficult to be softened at the temperature of the brazing while it is of high quality, and excellent in the mechanical strength, especially in the hardness, and difficult to be flawed or deformed. The fluidity of this material during the casting is improved by the deoxidation effect of these added elements, and this material is free from the material defects such as pin holes, and has the color and the gloss specific to Ag of high quality. Y, Sm, Eu, or Er is appropriate for the rare earth metal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an Ag or AgCu alloy material for brazing ornaments such as rings and necklaces, which are pure A as high grade Ag.
A for brazing ornaments of Ag-based alloys with high g and Ag contents
g or AgCu alloy material.

[0002]

2. Description of the Related Art Recently, there is a growing need for particularly high-quality Ag as a decorative material. However, high-quality Ag
In particular, pure Ag has the highest commercial value as the highest grade, but it is weak in mechanical properties, especially in hardness, and it may be flawed or deformed during manufacture, handling and use. Particularly, in the case of products accompanied by brazing, it is fatal that the material is softened by the influence of heating during brazing.

[0003]

DISCLOSURE OF THE INVENTION The present invention provides an Ag or AgCu alloy material for brazing ornaments, which has high quality but is not easily softened and which has excellent mechanical strength, especially hardness.

[0004]

The Ag or AgCu alloy material for brazing ornaments of the present invention comprises Si, Ti, Zr,
One or two or more of Hf and rare earth elements are 0.01 to 1% by weight in total and the balance is Ag or AgCu alloy.

[0005]

According to the Ag or AgCu alloy material for brazing ornaments of the present invention constructed as described above, Si, Ti,
Recrystallization temperature is high and brazing is high because one or two or more rare earth elements such as Zr, Hf, Y, Sm, Eu, and Er are 0.01 to 1% by weight in total and the balance is Ag or AgCu alloy. It does not tend to soften easily and therefore can maintain its hardness after brazing. Also, pure Ag or Ag
The mechanical strength is improved and the hardness is particularly improved as compared with the Cu alloy. Here, Si, Ti, Zr, Hf, Y, S
One or two from rare earth elements such as m, Eu, Er
If the total content of the above types is less than 0.01% by weight, the effect of improving the hardness is small, and if it exceeds 1% by weight, the high quality or characteristics of Ag or AgCu alloy is impaired. Note that Si, Ti, Z
As long as it is a rare earth element such as r, Hf, Y, Sm, Eu, Er, etc., not only one kind but also two or more kinds have similar improving effects. In addition, Y, Sm, Eu, Er and other S
c, La, Ce, Pr, Nd, Pm, Gd, Tb, D
Rare earth elements such as y, Ho, Tm, Yb, and Lu also have similar improvement effects. In addition, Si, Ti, Zr,
Due to the deoxidizing action of Hf and rare earth elements, the flow of molten metal during casting is improved, and a good material with no material defects such as pinholes is obtained.

[0006]

EXAMPLES Examples and conventional examples will be described below. First, as an example, Ag or AgCu 7.5 wt%, Ag
A material containing 4 wt% of Hf, Y, Sm, Eu, and Er in 10 wt% of Cu as a master alloy was melt-cast in a high-frequency vacuum melting furnace, and the predetermined content was 0.01 wt%, 0.2
The composition was made into a composition of 1% by weight and 1% by weight, and then wire drawing and forming were performed to form a kamaboko tape having a processing rate of 90%, which was then cut and formed into a ring shape. As a conventional example, the purity is 99.9%
7.5% by weight of pure Ag and AgCu (Si, Ti, Z
r, Hf, and rare earth element-free) were melted, cast, drawn, and molded into a kamaboko-shaped tape having a processing rate of 90%, and then cut and formed into a ring shape. However, the ring-shaped molded products of the above examples and conventional examples were brazed with an Ag-based brazing material at a brazing temperature of 620 ° C., and then finish-polished to form a ring. However, it was confirmed that the mechanical strength after brazing was better in the example than in the conventional example. The hardness before and after brazing was examined for a content of 0.2% by weight. As a result, in the conventional example Ag, Hv 90 to 100 was obtained before brazing, but after Hv 35 to Hv 35.
It had softened to 45. Further, in the conventional example AgCu of 7.5% by weight, it was Hv 140 to 150 before brazing, but was softened to Hv 75 to 85 after brazing. On the other hand, in the examples, the hardness as shown in Table 1 below was maintained. Also, as a result of the finish appearance quality inspection, the hue of the example,
The luster was good.

[0007]

[Table 1]

Further, in the same manner as in the above embodiment, S
Ag containing 0.01% by weight, 0.2% by weight, and 1% by weight of i, Ti, Zr, and rare earth elements other than the above examples, respectively.
Alternatively, 7.5% by weight of AgCu and 10% by weight of AgCu were brazed and then finish-polished to obtain a ring, which had the same effect as above.

[0009]

As described above, according to the Ag or AgCu alloy material for brazing ornaments of the present invention, Si, Ti, Z
0.01 to 1% by weight in total of one or two or more rare earth elements such as r, Hf, Y, Sm, Eu, and Er, and the balance Ag or AgCu alloy, so high-grade Ag
In addition, it is hard to be softened even after brazing, and has excellent mechanical strength, especially hardness. Therefore, there is an effect that an excellent brazed decorative article that is not easily scratched or deformed can be obtained. Further, it is excellent in workability, machinability, and polishability after casting, is easy to process, and is a decorative article having a color and luster peculiar to high quality Ag. Furthermore, since a brazing material having a high brazing temperature can be used, a brazing material having a high melting point can also be used, and the range of brazing material selection is broadened.

Claims (2)

[Claims] 1. A brazing decoration characterized by a total of 0.01 wt% to 1 wt% of Si, Ti, Zr, Hf, and one or more of rare earth elements, and the balance Ag or AgCu alloy. Ag or AgCu alloy material for products. 2. The brazing decorative article A according to claim 1, wherein the rare earth element is Y, Sm, Eu, or Er.
g or AgCu alloy material.