Copper tungsten carbide powder material for making electrical contacts

Abstract

The invention discloses a copper tungsten carbide powder material for preparing electric contacts, comprising 12-30 parts of tungsten carbide powder, 16-27 parts of copper powder, 5-13 parts of tin, 3-17 parts of molybdenum powder, and 2 parts of binder ~10 parts, cobalt 5~11 parts, cermet 4~10 parts, rare earth 3~10 parts, aluminum silicon intermetallic compound 3~9 parts, nickel 1~9 parts, cerium 1~8 parts, reducing agent 1~8 parts 1 to 9 parts of lithium carbonate, 1 to 9 parts of lanthanum oxide. The copper tungsten carbide powder material used for preparing electrical contacts of the present invention improves the oxidation resistance of the material, and at the same time comprehensively improves the arc burning resistance, welding resistance and electrical wear resistance of the material. The prepared contact products not only have excellent electrical conductivity and low contact resistance, but also have high resistance to welding, arc burning resistance and electrical wear resistance, and can be widely used in household appliances, electronic instruments, relays, contactors, Low-voltage electrical products such as push button switches and circuit breakers.

Description

technical field [0001] The invention belongs to the field of copper-based electric contact materials, in particular to copper tungsten carbide powder materials used for preparing electric contacts. Background technique [0002] Electric contacts are made of silver or silver alloy wires and copper wires through a special cold heading machine based on mechanical and physical principles. It is an important part of high-voltage circuit breakers, switch cabinets, isolating switches, and grounding switches. Performance directly affects the quality and service life of these high-voltage electrical appliances. Copper alloy electrical contact materials for low-voltage electrical appliances are often manufactured by powder metallurgy. Copper has excellent electrical and thermal conductivity, second only to silver. Therefore, replacing silver alloy with copper alloy in electrical contact materials can save precious metal silver, reduce product costs, and achieve sustainable developmen...

AI Technical Summary

Problems solved by technology

When copper is used as an electrical contact material, under the action of the contact resistance of the contact and the arc, the temperature of the contact surface rises sharply, and the cuprous oxide on the contact surface is converted into copper oxide, forming an oxide film that is not easy to conduct electricity, resulting in electrical contact failure