Alkali metal-added silver-based sliding contact material containing rare earth

Abstract

The invention discloses an alkali metal-added silver-based sliding contact material containing rare earth, which is prepared by adding a little amount of alkali metal elements in AgCuNiRE, AgCuPdNiRE, AgCuZnNiRE and AgCuPdZnNiRE, wherein the additive amount of alkali metals Li, Na, K is 0.01-3.0% by mass. The elements can be respectively added solely or two or three of the elements are added in amatching manner, and the total additive amount is not greater than 3.0%. The material of the invention has good self-lubricating and arc suppressing properties, can be used for manufacturing commutators of DC motors, can prolong the service life and improve the contact stability and the reliability under high temperature and high humidity conditions, and can meet the requirements of small DC motors with long service life.

Description

technical field

[0001] The invention relates to a metal material, in particular to a rare earth-containing silver-based sliding electrical contact material added with alkali metal. Background technique

[0002] The commutator and brush slices are the core components of small DC motors. The main load they bear during work is the sliding friction under the load condition, but at the moment of current commutation, the commutator and brush slices will be disconnected. Therefore, there is a transformation of "closing and breaking". As the motor speed increases, the frequency of this transformation increases, and the resulting arc effect cannot be ignored. Therefore, the electrical contact material also bears the dual effects of electrical friction and arc erosion. The former causes mechanical wear of the material, and the latter causes damage such as melting, splashing and welding of the material at high temperature.

[0003] The mechanical wear forms of DC motor commutator are...