High-power hard silver-based electrical contact material

Abstract

The invention discloses a high-power hard silver-based electrical contact material. The material comprises the following components by weight percentage: 0.02-0.12% of Zn, 0.04-0.20% of Cr, 0.05-0.15% of Mn, 0.01-0.20% of Ba, 0.15-0.35% of Co, 0.01-0.40% of Sn, 0.02-0.50% of Sr, 0.005-0.1% of V, 0.04-0.20% of Ti, the remainder being silver. Preferably, the material comprises the following components by weight percentage: 0.04-0.10% of Zn, 0.05-0.17% of Cr, 0.07-0.13% of Mn, 0.03-0.18% of Ba, 0.17-0.30% of Co, 0.04-0.36% of Sn, 0.08-0.42% of Sr, 0.007-0.08% of V, 0.06-0.17% of Ti, the remainder being silver. The electrical contact material is high in power, high in hardness and low in cost, exhibits great conductivity, includes rich resources, and is wear-resistant.

Description

Technical field [0001] The invention relates to an electrical contact material, in particular to a high-power hard silver-based electrical contact material. Background technique [0002] Among low-voltage electrical contact materials, silver-nickel graphite contact materials are mainly used in various plastic case circuit breakers and frame type universal circuit breakers. This is because the material has good welding resistance and conductivity, and low and stable contact resistance. The role of graphite is to prevent the adhesion and welding of the contacts, and does not form any insulator to increase the contact resistance. However, graphite has a stable arc tilt and poor thermal stability in the air. Because the existing silver-nickel graphite contact material does not pay attention to the graphite content and processing technology during the processing, the poor arc corrosion resistance is the biggest defect of the material . At present, the mechanical powder mixing proce...

AI Technical Summary

Problems solved by technology

However, graphite has a stable arc inclination and poor thermal stability in the air. Because the existing silver-nickel graphite contact materials do not pay attention to graphite content and processing technology during processing, poor arc corrosion resistance is the biggest defect of this material.

At present, the mechanical powder mixing process is generally used for production. This process is simple and easy, with few processes, low equipment requirements, high material utilization rate, and low production cost. However, the obtained contacts have uneven structure, poor compactness, and arc High erosion rate, low power