Silver nickel material is easy to prepare, low processing cost, can produce rivet type contact and sheet contact, widely used in various fields
A silver alloy made of nickel added to silver.The addition of a small amount of nickel can refine the grain, improve the hardness, wear resistance and burn resistance of silver, and slightly increase the contact resistance.Because silver and nickel are not mutually soluble, it is prepared by powder metallurgy, and the general nickel content is 5% ~ 40%.Silver-nickel alloy electric contact material has good electrical and thermal conductivity, strong resistance to metal transfer, arc burning, electrical erosion and other capabilities, good wear resistance, high strength, and good ductility and cutting ability, contact resistance is higher than silver, the physical properties of silver-nickel alloy are shown in the table.In the past, silver and nickel powders were prepared by chemical co-deposition method, and then silver and nickel coated powders were prepared by chemical method.Chemical powder production process is generally more complex, the cost is high, with the development of powder production technology, in recent years, the use of mechanical atomization method to get very fine powder, remix, pressing, sintering, extrusion, the same reliable performance of silver-nickel alloy.Recently, the technology of silver and nickel spraying powder and mechanical alloying has been developed.A small amount of rare earth elements can be added to silver-nickel alloy to improve its properties.Silver - nickel alloys are commonly used in low - voltage electrical appliances.AgNi10 is mainly used for ac contactor below 20A;AgNi(15 ~ 40) can withstand greater loads.As a contact material, silver-nickel alloy is widely used in all kinds of switches, controllers, voltage regulators, circuit breakers, automotive electrical appliances, magnetic starters and so on.
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