Characteristics and application of silver-tungsten alloy contacts

    Silver-tungstenalloys (silver-tungstenalloys) have high strength, strong resistance to electric arc erosion, anti-adhesion and anti-arc welding. Manufactured by powder metallurgy. Aluminum alloys with more than 60% tungsten are mostly produced by the wet method. Precision memory alloy contacts are used as low-voltage output power switches, starter-restart switches, locomotive head switches, pre-contacts of high-current switches, and heavy-load solenoid valves, air circuit breakers, etc. Adding cobalt can improve the lubricity of silver to tungsten and reduce contact resistance.

    Silver-tungsten alloys are widely used in high temperature resistant coatings, electrical alloys for precision special alloy contacts, metal processing electrical grades, and raw materials for microelectronics technology. Metallurgical industry, machinery and equipment, sports equipment and other fields.

    Silver tungsten raw materials have excellent laser welding and corrosion resistance, so they are widely used in manufacturing and isolation switches in China. Various types of silver tungsten impart more silver with higher electrical conductivity, and higher tungsten promotes greater erosion and welding characteristics.

    The raw materials of precision silver-nickel alloy contacts are made of high tungsten composition, which damages the contact points for large and medium-sized frame circuit breakers, and brings a stable line current molded case circuit breaker to touch and maintain various disconnectors. mechanical equipment. This contact point can also be used for high current flow contact resistance contact welding and galvanic erosion. Silver-tungsten electrodes are generally used for AC welding of aluminum and aluminum-magnesium alloys.

    The preparation method of silver tungsten is powder metallurgy, and the total output of tungsten alloy exceeding 60% is higher after immersion in water. Mainly used in low-voltage switching power switches, lifting and hoisting switches, switching electric locomotives, high-current switch contacts, super-heavy solenoid valves, air circuit breakers, etc. with cobalt added. All of these can improve the ability of wet silver tungsten to reduce contact resistance.