High-performance silver-saving electric contact material and preparation method thereof

Abstract

The invention discloses a high-performance silver-saving electric contact material and a preparation method thereof. The high-performance silver-saving electric contact material comprises the following components by percentage by weight: 45-73 percent of (WC.TiC), 2-5 percent of cobalt, less than 0.1 percent of rare earth and the balance of silver, wherein the granularity of arc-protection components is 0.7-4 microns (WC.TiC); the intervals between fine (WC.TiC) is controlled at 0.1-1.0 micron. By developing a special process route, good wettability / combination is realized between silver and (WC.TiC) in a static state, fine textures needed for bringing the potential of the material into play can be produced, and the hard phase granularity and dispersion uniformity are ensured; one to more trace elements are added into the material to improve the wettability between liquid silver and a hard phase (WC.TiC) under the action of electric arc, so that the comprehensive performance of the material is improved comprehensively; meanwhile, a small amount of rare earth is added to improve the performance of the grain boundary of a silver material.

Description

technical field [0001] The invention relates to a metal composite material, in particular to a high-performance silver-saving electrical contact material and a processing method thereof. Background technique [0002] In low-voltage, medium-to-high-current electrical switches, as a contact material, silver-based composite materials dominate, which mainly depends on silver's good electrical and thermal conductivity and stable chemical properties. However, silver is a rare and precious metal with high value and limited output. Therefore, reducing the silver content as much as possible while further improving the performance of silver-based composite materials is a problem of great practical significance that material workers are concerned about. [0003] Silver tungsten contacts have been widely used since they came out in 1937. Silver tungsten is a silver-containing sintered contact material with tungsten as the skeleton. The sintered material combines the high electrical con...

AI Technical Summary

Problems solved by technology

There are still two problems with silver (WC.TiC) materials: 1. The wettability between silver and (WC.TiC) is poor. The materials produced by daily processes have high gas content, and the electrical performance potential of the materials cannot be effectively exerted.

2. In order to reduce the gas content of the material, the larger particle size (WC.TiC) particles are used, which will cause a large dispersion of the material's ability to resist arc burning (that is, the material's performance is unstable), and also limit the material. The performance potential of the

[0007] If the above problems are not effectively solved, this material can only stay in the laboratory or on a theoretical level.

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