Silver tungsten carbide graphene electrical contact material and preparation method thereof

Abstract

The invention discloses a silver tungsten carbide graphene electrical contact material and a preparation method of the silver tungsten carbide graphene electrical contact material. Silver is adopted as a base material, tungsten carbide serves as a first reinforcement phase, graphene serves as a second reinforcement phase, and nickel serves as a third reinforcement phase. The invention further discloses the preparation method of the material. Silver / graphene oxide / nickel compound powder is prepared through a chemical method; tungsten carbide powder is subjected to ball milling compounding withthe silver / graphene oxide / nickel compound powder, a silver / tungsten carbide / graphene oxide / nickel compound powder body is obtained, then the compound powder body is subjected to reduction treatment, and a silver / tungsten carbide / graphene / nickel compound powder body is obtained; and the material is prepared through a powder metallurgy technology or prefabricated body pressing and forming or an airpressure infiltration technology. The nickel element is introduced through a chemical coprecipitation method, then through ball milling and powder mixing, the silver, nickel and tungsten carbide forma mechanical alloying structure, good combination between the tungsten carbide and a base body is guaranteed, operation is simple, the process is easy to control, and scaled production is realized easily.

Description

technical field [0001] The invention relates to a preparation method of an electrical contact composite material in the field of material technology, in particular to a silver tungsten carbide graphene electrical contact material and a preparation method thereof. Background technique [0002] Silver tungsten carbide composite material is one of the widely used electrical contact materials. Due to the lack of mechanical properties and electrical contact properties of pure silver, in order to meet the requirements for the use of electrical contact materials, silver-based electrical contact materials will be prepared by adding other reinforcements and silver composites. Tungsten carbide is widely used as the best reinforcement for high-current silver-based electrical contact materials. The tungsten material will generate tungstate and tungsten oxide during the process of switching on and off the large current, which will increase the contact resistance of the contact, and then...

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Problems solved by technology

The patent introduces zirconium carbide hard phase, but the material has no significant characteristics of anti-welding performance, and will increase the product cost. However, the graphite introduced in the invention patent has excellent anti-welding performance, but the specific gravity of graphite and other materials The difference is big, and the ordinary powder mixing method will cause material segregation and graphite agglomeration, which will bring many performance effects

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