A kind of silver base electric contact material and preparation method thereof

Abstract

The invention relates to a silver-based electrical contact material and a preparation method thereof. The silver-based electrical contact material is characterized in that the material is formed by diamond-cerium oxide nuclear shell compound particles and silver. And the material is prepared by using the method comprising the following steps that: the diamond-cerium oxide nuclear shell compound particles and the silver are added into a blender mixer based on a proportion; a wetting agent is added and mixing is carried out for an uniform effect, and granulation is carried out by using a granulating machine; and a mixed material after the granulation is added into a die to carry out thermo-compression formation and nitrogen or argon filling is carried out in a vacuum sintering furnace under the temperature of 800 to 950 DEG C to protect sintering for 1 to 4 hours. According to the invention, the advantages are as follows: on the basis of granulation, particles with largely different densities are mixed uniformly; and each small particle has the identical components. The diamond-cerium oxide particles after the granulation are distributed uniformly in the electrical contact, so that the molded electrical contact material components are distributed uniformly; and thus the surface temperature is effectively reduced and the fusion welding and electrical ablation can be prevented.

Description

technical field

[0001] The invention belongs to the technical field of electric contact materials, and in particular relates to a silver-based electric contact material and a preparation method thereof. Background technique

[0002] Powder metallurgy electrical contact material (powder metallurgy electrical contact material) is a powder metallurgy material used in contact parts of various electrical equipment and instruments that make and break current. It transmits, withstands and disconnects the specified current to protect and control electrical appliances. Therefore, powder metallurgy electrical contact materials (hereinafter referred to as electrical contact materials) are key materials in electrical equipment and instruments.

[0003] High-performance electrical contact materials generally require the following properties: good electrical and thermal conductivity, high withstand voltage characteristics, arc ablation resistance, fusion welding resistance, low current i...