Elastic electric contact composite material capable of replacing beryllium copper and preparation method thereof

Abstract

The invention discloses an elastic electric contact composite material capable of replacing beryllium copper and a preparation method thereof. The preparation method comprises the following steps of compounding and rolling stainless steel strips and Cu (copper) strips, so as to prepare a stainless steel / Cu two-layer composite strip or a stainless steel / Cu / stainless steel three-layer composite strip; performing diffusion and heat treatment on the stainless steel / Cu two-layer composite strip or the stainless steel / Cu / stainless steel three-layer composite strip; performing circulating treatment (rolling and softening heat treatment) on the composite strip after heat treatment for multiple times; withdrawing and straightening the composite strip after heat treatment; cleaning and crushing thecomposite strip after withdrawal and straightening by phases, and separating strips; punching the composite strip after strip separating, so as to obtain the required elastic electric contact material. The preparation method has the advantages that by combining the phased heat treatment and the multiple times of circulating treatment (rolling and softening heat treatment), the environment-friendlyelastic electric contact composite material with high strength, high elasticity and low resistivity can be prepared; the technology is simple, the cost is low, and the special requirement on equipment is avoided.

Description

technical field [0001] The invention relates to the field of electrical devices, in particular to an elastic electrical contact composite material replacing beryllium copper in the field of new material application and a preparation method thereof. Background technique [0002] Beryllium copper alloy is widely used in elastic electrical contact elements of electrical switches due to its excellent mechanical, chemical and electrical properties such as high strength, elasticity, fatigue strength, corrosion resistance, electrical conductivity and non-magnetic properties. However, beryllium and its compounds have huge toxic and side effects on the human body and are one of the serious industrial hazards. Therefore, it is particularly important to find an environmentally friendly electrical contact elastic material with low beryllium or even no beryllium. [0003] 301, 304 and 316L stainless steel have been widely used in industry, furniture decoration industry and food and medic...

AI Technical Summary

Problems solved by technology

The processing equipment involved in the welding method is simple and can effectively composite stainless steel plates and Cu or other metal substrates. However, due to the use of solder and high-temperature treatment, brittle materials such as intermetallic compounds are easily produced at the welding joint surface, which leads to mechanical damage of the welding joint surface. poor performance

[0012] Although the method of explosive compounding can solve the problem of intermetallic compounds at the composite interface, due to its technological characteristics, the thickness of the composite material is limited, and the environmental pollution and safety problems caused by the explosion are serious [Document 4]

[0013] The preparation method of single cold rolling → annealing can effectively improve the surface oxidation of the composite material, rust on the end surface, uneven composite layer, etc., and this method has the advantages of high production efficiency and high dimensional accuracy, but the single rolling makes The amount of processing deformation is small, which cannot meet the production requirements of thin plate materials (≤0.5mm) 【Document 5】

[0014] The hot rolling method can achieve rapid and effective compounding of materials, and can produce larger-sized samples, but it is difficult to control the size and thickness of rolling, and the surface quality is poor, so it is often used in the production of blanks [Document 6]

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