Sliding electrical contact material with high rare earth content

Abstract

The invention discloses a sliding electrical contact material with high rare earth content. The sliding electrical contact material is an alloy material containing Ag, Cu, Ni and Re and comprises the following components by weight percent: 4 Wt% of Cu, 0.5 Wt% of Ni, 0.6-2.2 Wt% of Re and the balance of Ag, wherein Ni elements are distributed in an Ag matrix in the form of spherical particles with particle sizes of 3-8 mu m; Cu elements are uniformly distributed in the Ag matrix in the form of particles; partial Re elements are dissolved in the Ag matrix; and the rest part of the Re elements are separated out near a grain boundary in the form of an (AgCu)xRe compound. The rare earth content in the material is improved; the material is manufactured by virtue of the processes of applying anexternal field in an alloy founding procedure under vacuum and the like; the recrystallization temperature is improved; the capability of resisting electric arc corrosion is increased; the hardness of an alloy is not only increased, but also the lubrication action in a working condition is increased synchronously; and the wear is decreased.

Description

technical field [0001] The invention relates to electrical contact material technology, in particular to a sliding electrical contact material with high content of rare earth elements. The sliding electrical contact material is a silver-based electrical contact material with excellent structure, which can be used as a sliding contact alloy for a commutator of a micro-motor material used. Background technique [0002] As a high-tech product that combines advanced manufacturing technology and new electronic information technology, micro-motor is an indispensable electronic device in the manufacturing of audio-visual electronic equipment, office automation equipment, communication equipment, automobiles and household appliances. The commutator is one of the core components of the micro motor. It cooperates with the brush to realize the current commutation and drive the motor to run. Under actual working conditions, the commutator bears the dual effects of sliding wear and arc ...

AI Technical Summary

Problems solved by technology

The above electrical contact materials are mostly used under the condition of weak current. They are all smelted by vacuum induction furnace. During the smelting process, argon gas is used for protection. Due to the large difference in physical properties between the added alloy elements, it is easy to cause composition segregation and Disadvantages such as uneven composition, especially when the Ag alloy is smelted, it is easy to cause bubbles, shrinkage and shrinkage in the ingot, and the addition of alloying elements can easily cause the ingot to be mixed.

At present, the technology and products of Ag alloy sliding electrical contact materials prepared under vacuum conditions and using external field technology have not been disclosed in relevant literature.

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