Disconnecting switch contact material and processing technology therefor

Abstract

The invention discloses a disconnecting switch contact material and a preparation method therefor. The electrical contact material body comprises the components of 45-73 wt% of tungsten carbide, less than 0.05% of nickel and the balance of silver; a welding layer comprises the components of 40-60% of silver, 20-30% of copper and the balance of at least one kind of zinc or phosphorus; the grain diameter of the tungsten carbide is 0.7-4 um; the tungsten carbide can replaced by C powder; the ratio of tungsten to titanium in the C powder is 7-8:3-2; and the C powder can be replaced by W powder or Ti powder. By adoption of the preparation method, the silver solder can be adhered to the surface of the electrical contact product at a lower cost to enable the joint between the solder and the electrical contact product to be firmer so as to reduce the risk of a quality problem caused by welding; the technology is not limited to the only condition that the silver tungsten carbide material is covered with the solder; in fact, the technology is applicable to production of flake-shaped, strip-shaped and all other products containing silver electrical contacts; and the contact products are widely applied to various levels of high voltage electric apparatuses, low voltage electric apparatuses, and vacuum switches.

Description

technical field [0001] The invention relates to a metal composite material, in particular to a material and a processing technology of a disconnector contact. technical background [0002] Vacuum circuit breakers require the following requirements for contacts: high current breaking capacity; low cut-off value; good voltage withstand capacity; low and stable contact resistance and temperature rise; These requirements contradict each other, and it is impossible to meet all these requirements with one metal. For example, the current breaking capacity and current interception value are affected by the melting point and vapor pressure of the material. The vapor pressure is high, and the alloy has a very high cut-off value. On the contrary, the current breaking ability will be significantly affected. Therefore, in many practically used alloy materials, at least two elements whose insufficient properties can be complemented are used in combination. [0003] At present, in vie...

AI Technical Summary

Problems solved by technology

Because electrical appliances manufacturers are often not familiar with the material properties of the contacts, the welding materials used are not firmly bonded to the base of the electrical contact products, and the quality of power supply is often affected by welding quality problems during use.