Silver-copper-rare earth composite material

Abstract

The invention discloses a silver-copper-rare earth composite material used for manufacturing micromotor commutator components, comprising a copper layer and a silver alloy layer inlaid and compoundedon the copper layer. The composite material is characterized in that the silver alloy layer is silver alloy containing 3-8% of Cu, 0.2-0.8% of Sn, 0.2-0.8% of Ce and the balance Ag. The silver alloy layer (1) is inlaid and compounded on part of the surface of the copper layer (2). The material features excellent abrasion resistance, arc ablation resistance, welding resistance, sulfurization resistance and metal transfer resistance, and low and stable contact resistance. The micromotor commutator components manufactured by the material are suitable for the manufacturing industries of audio-visual electronic equipment, office automation equipment, communication equipment, automobiles and household appliances and for such electronic devices as electronic toys, etc.

Description

technical field [0001] The invention relates to an electrical contact composite material, in particular to an environment-friendly composite conductive material for developing a micro-motor commutator. Background technique [0002] DC micromotor is an indispensable electronic device in the manufacturing of audio-visual electronic equipment, office automation equipment, communication equipment, automobiles and home appliances. The DC micro-motor uses a three-pole commutator to slide in contact with the brushes to realize power transmission and maintain the motor running. The working conditions of the commutator and brushes have a decisive influence on the stability and service life of the motor. [0003] In the late 20th century, the advent and mass production of precious metal composite materials brought fundamental changes to the commutator materials of micro-motors. Replace a single metal or alloy with the combination of the excellent electrical contact performance of th...

AI Technical Summary

Problems solved by technology

Due to the toxicity of Cd, AgCd / Cu has been phased out gradually. In high temperature, high humidity and atmosphere containing sulfur and hydrogen sulfide, non-conductive sulfide and oxide film are easily formed on the surface of AgCu / Cu, which will cause unstable contact resistance and reduce reliability. At the same time, its hardness and wear resistance are also low. Silver-copper alloys have a tendency to segregate. Adding appropriate Ni to form an AgCuNi alloy can significantly reduce its segregation, and adding appropriate Zn to form an AgCuZnNi alloy can improve its wear resistance and Corrosion resistance, but the electrical life of this type of composite material is insufficient, especially when used at a higher temperature, the wear resistance and service life are reduced

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