Preparation method of silver-tungsten composite copper alloy electric contact material

Abstract

The invention relates to the technical field of electric contact materials, in particular to a preparation method of a silver-tungsten composite copper alloy electric contact material. Comprising the following steps that (1) silver, tungsten and a first additive are mixed and then subjected to ingot pressing and sintering to prepare a silver-tungsten ingot blank, and the first additive comprises one or more of transition metal and rare earth oxide; (2) mixing copper, diamond and a second additive to prepare copper alloy powder, wherein the second additive comprises oxide of ductile metal; (3) carrying out sand blasting treatment on the surface of the silver-tungsten ingot blank; (4) the surface of the silver-tungsten ingot blank subjected to sand blasting treatment is coated with the copper alloy powder, and after sintering, a copper-coated alloy ingot blank is prepared through hot repressing; and (5) the copper-clad alloy ingot blank is made into the profile. According to the method, through mixed use of the first additive, the second additive, the diamond and the blast sand, the interface bonding strength between the silver-tungsten ingot blank and the copper alloy layer is enhanced from the physical level and the chemical level, and the tightly-bonded copper-clad alloy ingot blank is obtained.

Description

technical field [0001] The invention relates to the technical field of electrical contact materials, in particular to a preparation method of a silver-tungsten-copper-clad alloy electrical contact material. Background technique [0002] Silver-tungsten electrical contact materials not only have the good electrical conductivity and thermal conductivity of silver, but also have the characteristics of high melting point, high hardness, high breaking, arc erosion resistance, wear resistance, welding resistance, and less material transfer of tungsten. They are widely used In universal circuit breakers, molded case circuit breakers, leakage circuit breakers and other fields. At present, there are two main methods for the preparation of silver-tungsten electrical contact materials: (1) solid-phase method: contact materials are obtained by mixing powder, forming, sintering, and repressing, but the silver-tungsten electrical contact materials prepared by this method are relatively T...

AI Technical Summary

Problems solved by technology

However, in this application, it is necessary to compound the silver layer on the silver-tungsten green body, and also need to plate silver on the copper sheet. These two steps all need to use a certain amount of silver, and the amount of silver powder will increase instead, which not only leads to an increase in cost, but also Its performance is not as good as that of direct composite silver layer

Second, when the copper sheet is silver-plated or when the AgW50 body is combined with the silver-plated Cu sheet, a small amount of oil and impurities may be easily introduced in the production process, which will affect the interface bonding strength between copper and silver, making the AgW50 layer and There is a phenomenon of low bonding strength in local areas between the welding Cu layers, and there is a risk of contact falling off during the use of electrical appliances

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