JPS5926641B2 - composite material - Google Patents

Description

[Detailed description of the invention] The present invention relates to composite materials of noble metals and noble metal alloys.

Precious metals and precious metal alloys have excellent chemical stability and are widely used in places where they come into contact with various corrosive gases and active substances, regardless of whether they are at room or high temperatures. Growth occurs and progresses from secondary recrystallized grains to abnormal grains over time, and the mechanical properties become extremely weak, which may not only prevent it from performing its original function, but also lead to accidents.

Therefore, in order to prevent the formation of such crystal grains, nonmetal fine particles are dispersed in the base metal to form a so-called dispersion-strengthening material. However, as mentioned above, this dispersion-strengthened material contains non-metal fine particles, which significantly inhibits the wettability and weldability of the base metal, making processing such as brazing or welding difficult. It was possible. Therefore, dispersion-strengthened materials are used only for parts that do not require processes such as brazing or welding, and precious metals and precious metal alloys with poor durability are often used for parts that require such processes. Therefore, the present invention solves the above-mentioned drawbacks, and requires at least welding or brazing of a dispersion-strengthened material made by dispersing non-metal fine particles such as metal oxides, carbides, borides, etc. in precious metals and/or their alloys. The objective is to obtain a material that improves durability, durability, and workability by combining precious metals or alloys in the desired locations. Therefore, the present invention provides Au, Ag, Pt, Pd
and/or dispersion-strengthened material made by dispersing 0.05 to 10% by weight of non-metal fine particles such as metal oxides, nitrides, borides, carbides, etc. in its alloy, at least in areas where processing such as welding or brazing is required. It is a composite material in which Au, Ag, Pt, Pd, or an alloy thereof is combined in advance into a plate or wire.

Here, the present invention will be described in more detail while explaining specific examples.90% Pt-Rh alloy powder 99
．． 5 parts and 0 aluminum oxide powder with an average particle size of 0.05μ
．． Prepare a mixed powder by stirring 5 parts day and night in a ball mill, and fill it into a powder mold in three layers in the thickness direction at a ratio of 1:821, consisting of alloy powder, mixed powder, and alloy powder. shi, lcw
Thickness 50mm width 10 while applying pressure of lton per i
The composite material was preformed to a length of 0 mm and a length of 200 mm, fired at 1450° C. for 16 hours, and then rolled to a thickness of 0.5 mm in a predetermined process to obtain a composite material.

The material made in this way is made into a material with a width of 20 mm and a length of 60 mm, as shown in Figure 1.
Plate A cut to mm and drilled with 80φ hole and width 20m
Plate B cut to a length of 150 mm was welded at position -B using a small precision torch burner. In addition, there are those made of Pt material and 10% Ph-Rt, which is generally used in high temperature ranges.
Both specimens made of alloy materials were processed in the same manner as described above and used as experimental samples. The above test material was suspended in a high-temperature furnace as shown in Figure 2, and maintained at temperatures ranging from 600°C to 1400°C for one hour each. When the deflection was measured, the results shown in Figure 4 were obtained. In other words, the composite material of the present invention has the smallest amount of deflection. In addition, as for the tensile strength, as shown in FIG. 5, it can be seen that the composite material of the present invention has the least thermal influence.

According to the above composite material of the present invention, it has extremely high strength at room temperature and high temperature without impairing chemical resistance, electrical and thermal conductivity, and has good workability, so it can be used for plastic processing, brazing, welding, etc. This makes it possible to finish complex parts, and to improve the strength, the desired strength can be obtained by appropriately changing the type, amount, particle size, etc. of the added non-metallic fine particles. This makes it possible to reduce the amount of precious metals used, and furthermore, as the strength is improved, reinforcing materials are no longer required, and the structure of the parts can be simplified and reduced in weight.

Although the composite materials according to the above embodiments were manufactured using a powder metallurgy method, it goes without saying that they can be manufactured using other conventional methods such as hot rolling, explosion welding, and diffusion.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the shape of the test material, Fig. 2 is a perspective view showing the test state, Fig. 3 is a front view showing the state of the deflection test, Fig. 4 is a graph showing the deflection test results, and Fig. 5 is a perspective view showing the shape of the test material. The figure is a graph showing the tensile strength test results.

Claims (1)

[Claims] 1. A noble metal or a noble metal alloy that does not contain the above-mentioned non-metallic particles is applied to all or part of the outer periphery of a plate-shaped or linear dispersion-strengthened material in which non-metallic particles are dispersed in a noble metal or a precious metal alloy, by powder metallurgy, hot pressing, A composite material characterized by being composited by explosion bonding or diffusion.