One characteristic of the AgNi alloy contact is that when the temperature is extremely high, the mutual solubility of the two coexisting melts increases, causing the nickel particles of the AgNi alloy material to form a uniform and dispersed distribution, and melt a large amount of silver generated at the arc root into one body. After cooling, the structure formed by depositing in the silver matrix improves the material’s resistance to welding. When the nickel content in the AgNi material increases, higher temperatures and longer time are required to melt the nickel into the silver matrix. When condensed, aggregation of nickel oxide will be formed on the contact surface, which will cause the contact surface to The contact resistance increase. The higher the nickel content, the better the resistance to welding, but the greater the contact resistance on the surface.

Characteristics of AgCdO alloy contact material: The characteristic of AgCdO alloy contact material is that CdO in the material is easy to decompose, as long as the temperature is slightly higher than 930 ℃ and lower than the melting point of silver 960 ℃. When CdO is eroded by arc, CdO first decomposes into The volume of gas increases by several orders of magnitude, thus producing a significant arc-blowing effect. Another characteristic of it is that it has good resistance to fusion welding and a small arc wear rate. It has the best performance when the CdO content reaches 12% to 15%.