Processing method for manufacturing silver tungsten composite contact material

Abstract

The invention discloses a processing method for manufacturing a silver tungsten composite contact material, which comprises the following steps: putting tungsten powder in a reaction vessel, adding water and a proper amount of reducing agents, slowly injecting a silver-ammonia complexing solution under stirring, cleaning silver tungsten coating powder to become neutral, drying the powder, performing uniform ball milling treatment by a high-energy bowl mill, performing distressing treatment of the silver tungsten powder, performing primary pressing and molding, performing presintering, infiltration sintering, and secondary pressing with the protection of reducing atmosphere to obtain the silver tungsten composite contact material. The invention has an advanced and simple process; the distribution of tungsten particles in a silver substrate is improved by a coating process based on a chemical plating principle; a high-energy bowl milling process is selected to allow the powder particlesto repeatedly generate cold welding and fractures, which causes atomic diffusion in the powder particles and improves the mechanical properties, physical properties, electrical properties, and the like of the material; a high temperature presintering process is adopted, which increases the material compactness, greatly optimizes the conductivity, reduces resistivity, and improves arc erosion resistance.

Description

technical field [0001] The invention relates to a production process method for producing silver-tungsten composite contact materials used in electrical switches such as circuit breakers, heavy-duty switches, electromagnetic switches, and voltage regulating switches. Background technique [0002] Among the electrical contact materials of low-voltage electrical appliances, silver-tungsten contact materials are widely used in various molded case circuit breakers, frame-type universal circuit breakers, and automotive electrical appliances. The high melting point tungsten particles in the silver tungsten contact are dispersed in the silver matrix. The material has good arc corrosion resistance, wear resistance, low and stable contact resistance. [0003] In China, mechanical powder mixing or ordinary infiltration process is generally used for production. This process is simple and easy, with few processes, low equipment requirements, high material utilization rate, and low produ...

AI Technical Summary

Problems solved by technology

[0003] In China, mechanical powder mixing or ordinary infiltration process is generally used for production. This process is simple and easy, with few processes, low equipment requirements, high material utilization rate, and low production cost, but the obtained contact structure is not uniform. Poor compactness, high arc erosion rate