In order to meet the application requirement of low voltage electrical products, contact performance should have the following features: as high electrical conductivity and thermal conductivity; Higher crystallization temperature, melting temperature, the boiling point temperature and latent heat of melting, gasification of latent heat, electronic select work and free potential; Appropriate high density, hardness and elasticity. As far as possible little steam pressure, the coefficient of friction, the thermoelectric potential, soup because each coefficient, liquid metal didn't embellish Angle, bore surface membrane resistance and some components of chemical affinity with the shang medium. But so far, the actual application in low voltage electrical appliances silver alloy contact can fully meet the requirements of all the above.In the case of actual application usually choose the silver alloy contact material AgNi, AgCdO, AgSn02, Agw, AgC, AgWC
The low-voltage electrical products used in the silver alloy contact materials to consider the following four aspects: 1 high conductivity; Good arc open circuit performance; High fusion welding resistance; The surface of the lower according to the contact resistance.
Agvi alloy head when a feature is in high temperature, two coexistence of melt solubility increases with each other, make the AgNi alloy of nickel particles to form uniform dispersion distribution, and a large number of dissolving and arc root of silver fused. After cooling, collect product in silver matrix after the formation of the structure, make the material of fusion welding resistance was improvedWhen the nickel content in the AgNi material increase, need higher temperature and longer time may make the nickel smelting in silver matrix, when condensation in the contact list since the formation of nickel oxide concentration, this will make the contact for the electrical contact Yang increase. The higher the nickel content, fusion welding resistance, the better, but the surface contact resistance, the more people.
