Tungsten Carbide Copper Contact

Introduction

Tungsten carbide copper contact is electrical switch by the mechanical action of the circuit is turned on, breaking and continuous current-carrying element. Tungsten carbide copper contact is use tungsten carbide as a skeleton, and the composition of the composite material in the copper filled in the pores of the skeleton, the skeleton of its high melting point of contact to ensure the compressive strength, resistance to arc erosion, not only to improve the conductivity of copper, thermal conductivity and improved processing performance, but also in arc evaporation temperature can absorb a lot of heat from the arc, improve conditions and reduce galvanic action.

Properties

Tungsten carbide copper contact with high density, high conductivity, high strength and hardness, low resistivity, low thermal expansion coefficient and resistance arc burning properties. Advantage in electrical contact materials and electrode materials are applied to other materials in the short term can not replace.

Application

General tungsten carbide copper contact material series, is resistant to arcing good conductivity of Cu (copper) is formed by a combination of high hardness, high melting point, vapor pressure, chemical stability, good oxidation resistance material WC (tungsten carbide), and there are well, burning a small, excellent anti-welding performance electrical contact composite material, in the conventional Cu-WC series material WC mass percentage of 40 to 60%, the use of such materials in the biggest problem is due to the content of WC high, low conductivity in the contact surface is easy to form an oxide film, the resistance increases, conductivity is decreased, the contact heat damage to over-burning appliances, such contact is only used for higher current switch, circuit breaker etc., while medium current low-voltage electrical switches, circuit breakers, it is no longer applicable. Such material is made in molten state immiscible elements, workability, process than the poor, can only be produced by powder metallurgy method, which processes the internal structure is unstable tissue material, affecting the effect.