JPH079189A - Brazing filler metal for platinum and platinum alloy - Google Patents

Abstract

PURPOSE:To provide a brazing filler metal which is used for brazing of platinum and platinum alloys of personal ornaments including watch belts, etc., materials for constituting precision machinery and instruments, etc., has a low m.p., good workability, good wettability with base metal platinum and platinum alloys, sufficient mechanical strength via good joinability and small surface roughness, is not decolored even by a pickling treatment after brazing and has a good fit in color tones to the base metals. CONSTITUTION:At least one kind among 0.05 to 10.0% indium, 0.05 to 10.0% tin, 0.05 to 10.0% gallium and 0.05 to 5.0% germanium in weight compounding ratios are added to a base alloy consisting of 18.5 to 32.0% antimony in weight compounding ratio and the balance the platinum and impurities.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The disclosed technique is in the technical field of platinum and platinum alloy watch bands, rings, necklaces and other accessories, and brazing materials used for joining structural materials of various machines and instruments. Belong to

[0002]

2. Description of the Related Art As is well known, platinum and platinum alloy watch bands, rings, necklaces, and other accessories, and various machine tools and structural materials for devices are used for their aesthetic point of view or purpose of use. Further, in many cases, the materials themselves are joined due to structural factors.

Further, although there is a mode in which an industrial adhesive is conventionally used as a means for this joining, a brazing means using a so-called brazing material is generally used, and more effectively, a mixed flame of oxygen and city gas is used. Brazing means by heating or brazing means by electric furnace heating is widely used, and it is said that the heating temperature at that time is preferably 1000 ° C. or lower from the viewpoint of metallurgical factors, workability and the like.

A gold alloy or a palladium alloy is generally used for joining a brazing material used for such joining, particularly platinum and a base material of a platinum alloy.

[0005]

The gold alloy used as one of these brazing filler metals has a relatively low melting point and therefore has a relatively good brazing workability. Since a large amount of zinc, cadmium, etc. are contained, these additional elements react with the base material platinum during brazing work, and a brittle diffusion layer is formed at the brazing boundary, resulting in weak mechanical strength of the product. In addition, there is a drawback that the wettability with the base material platinum is poor, the bondability is poor, and the surface roughness of the brazing part is large, and in addition, it is necessary after brazing. There is a disadvantage that the brazing filler metal is discolored by the above-mentioned pickling treatment, and in addition, there is a discomfort in color tone with the base metal, platinum and platinum alloy, and therefore the aesthetic compatibility is poor. It was

Further, there is a demerit that the cost cannot be reduced in terms of price.

Further, another one of the brazing filler metals, a palladium alloy, is an alloy containing nickel, copper, silver and the like, and therefore has a high melting point, so that there is a drawback that the brazing workability is poor.
Further, there is a problem that the wettability with the base material platinum is poor and the bondability is poor, and further, there is a problem that the surface roughness of the brazed portion is large, and besides, platinum, which is the base material like the gold alloy, and
There was a poor aesthetic compatibility with the platinum alloy, which had a strange color tone.

[0008]

The object of the invention of the present application is to solve the problems of the brazing material for the base metal platinum and the platinum alloy based on the above-mentioned prior art, and has a low melting point and good brazing workability. It has good wettability with the base material platinum and platinum alloy and excellent bondability, and therefore has sufficient mechanical strength, and
The surface roughness of the brazing part is small, and in addition, it does not discolor even in the pickling process required after brazing, and it is similar in tone to the base metal platinum and platinum alloy. An object of the present invention is to provide an excellent platinum and brazing material for platinum alloy, which has good compatibility and is useful in the field of joining technology application in the metal product manufacturing industry.

[0009]

In order to solve the above-mentioned problems, the composition of the invention of the present application, which is based on the above-mentioned objects and has the above-mentioned object, has a weight compounding ratio of antimony of 18.5 to 32. 0.0%, the alloy consisting of the balance platinum and impurities has a low melting point, has good wettability with the base material platinum and the platinum alloy, has excellent bondability, and has sufficient mechanical strength, Moreover, the surface roughness of the brazed part is small, and the color tone is similar to the base metal platinum and platinum alloy, and the conformability is good. In addition, discoloration can occur even in the pickling process required after brazing. In addition, the weight ratio of indium is 0.05 to 10.0% and tin is 0.05 to 1 with respect to the above base alloy.
By adding at least one of 0.0%, gallium 0.05 to 10.0%, and germanium 0.05 to 5.0%, the melting point is lowered, brazing workability is improved, base metal platinum, and , The platinum alloy is used to improve the wettability, the bonding strength, the surface roughness, and other functions and effects to selectively promote the improvement of the technology.

[0010]

BACKGROUND OF THE INVENTION Next, the qualitative and quantitative background of the invention of this application will be described. Regarding antimony, 18.5 to 32.
When the content of 0% is less than 18.5%, the melting point is high,
It has been confirmed by experiments that not only it is difficult to work at the ideal brazing temperature of 1000 ° C., but also the wettability with the base material platinum and the platinum alloy decreases, and good bondability is impaired. On the other hand, even if it exceeds 32.0%, the melting point is 100.
Not only is the brazing work difficult at temperatures above 0 ° C,
Further, it was confirmed by an experiment that the bonding strength was lowered and, in addition, the color tone was different from that of the base material platinum and the platinum alloy. Therefore, the weight ratio of the antimony was 18.5 to 32. The optimum range is 0%.

Further, in the subordinate invention, the weight ratio of indium is 0.05 to 10.0%, tin is 0.05 to 10.0%, and gallium is 0.05 to 10.0%.
10.0%, 0.05-5.0 for germanium
The rationale for adding at least one of the
By adding at least one of them, the melting point is lowered, the workability of brazing is improved, the wettability with the base material platinum is improved, and the joint strength is further improved. This is because it was confirmed by experiments that each function and effect of reducing the surface roughness can be selectively promoted and improved.

Further, the reason for limiting the respective addition weight ranges is 0.05% for indium, tin and gallium.
%, A sufficient effect is not confirmed, while 10.0%
If it exceeds, the wettability with the base material platinum or platinum alloy decreases,
It has been experimentally confirmed that not only the brazing joint strength is lowered, but also discoloration occurs in the brazing portion in the pickling operation after brazing, so that the weight mixing ratio is 0.05 to 10.0.
% Is determined as the optimum range.

When germanium is less than 0.05%, the expected effect cannot be confirmed. On the other hand, when it exceeds 5%, the wettability with the base material platinum and the platinum alloy deteriorates like indium, tin and gallium. However, it was confirmed that a decrease in brazing joint strength occurred, and further it was found by experiments that discoloration occurs in the brazed portion in the pickling treatment work after brazing. 5.0
It is determined in a limited manner with% as the optimum range.

[0014]

Next, Table 1 below shows an example of the invention of this application in comparison with a conventional example of a conventional product.

[0015]

[Table 1] Each sample was melted in a well-known high-frequency heating and melting furnace to prepare a brazing material having a predetermined shape with a diameter of 2 mm and a length of 50 mm. On the other hand, the brazing material thus prepared was also known. Was finely pulverized by the treatment method of No. 1 to produce a brazing powder.

The brazing materials thus produced were tested by the following brazing test method, and the results shown in Table 2 were obtained.

[0017]

[Table 2] (1) Spreading test of brazing material Using a platinum base material of 30 mm in length and width and 1 mm in thickness, JIS Z
The test was conducted by a method similar to the method for testing the spread of hard solder of 3191, and the spread state of the solder and the surface roughness were observed.

(2) Brazing strength test Using the same platinum base material as described above, test pieces were prepared by the method according to the tensile and shear test methods of JIS Z 3192 brazing joint, and according to JIS Z 2241. Was tested using the tensile test method.

(3) Discoloration test The brazing material spreading test piece of (1) above was tested at 10% at 50 ° C.
All the pieces were immersed in a dilute hydrochloric acid solution and the degree of discoloration was observed.

[0020]

As described above, according to the invention of this application, basically, a weight ratio of antimony is 18.5 to 32.0%, and a brazing material composed of the balance platinum and impurities has a low melting point. Good brazing workability, good wettability with base metals platinum and platinum alloys, and excellent bondability. Therefore, it has sufficient mechanical strength, and the surface roughness of the brazed part is small. In addition, the pickling process required after brazing does not cause discoloration, and the same color tone as the base metal platinum and platinum alloy can be obtained. On the other hand, the blending ratio by weight is indium 0.05-10.0.
%, Tin 0.05 to 10.0%, gallium 0.05 to 1
By adding at least one of 0.0% and germanium 0.05 to 5.0%, the melting point is lowered, the brazing workability is improved, the wettability with the base material platinum and platinum alloy is improved, and the bonding strength is improved. The excellent effect that the functions and effects such as improvement and surface roughness reduction can be promoted and improved is exhibited.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takashi Horikawa 2-12-30 Aoyagi, Soka-shi, Saitama Prefecture Ishifukukin Industrial Co., Ltd. Soka No. 1 Factory (72) Kazuaki Koyama 2-chome, Aoyagi, Soka-shi, Saitama Prefecture 12-30 No. 30 Ishifukukin Kogyo Co., Ltd. Soka No. 1 Factory (72) Inventor Satoru Ogawa 2-12-30 Aoyagi, Soka-shi, Saitama No. 30 Ishifuku Kin Kogyo Co., Ltd. Soka No. 1 Factory

Claims (2)

[Claims] 1. A weight compounding ratio of antimony 18.5 to 32.
A brazing material for platinum and a platinum alloy, which is 0% and is composed of the balance platinum and impurities. 2. A weight compounding ratio of antimony 18.5 to 32.
It is 0%, and the weight ratio of the base alloy consisting of platinum and impurities is 0.05 to 10.0% indium, 0.05 to 10.0% tin, and 0.05 to 10.0 gallium.
%, Germanium 0.05 to 5.0%, and at least one kind of brazing material for platinum and platinum alloys.