Ag-WC-C Contacts Material

Ag-WC-C contacts material has been gradually replaced AgC5 contact material, because its excellent physical properties is better than the latter’s and it can reduce the use of silver material and saving cost. Ag-WC-C contacts material is mainly making use of the properties of good thermal conductivity and electrical conductivity of Ag and the properties of high hardness, high melting points and wear resistance of WC, which has been promoting the use, mainly used in electrical switches, such as, large capacity circuit breakers, molded case circuit breakers and automatic switches.

Traditional Ag-WC-C contacts preparation method is usually adopting powder metallurgy method --- pressing the mixing powder directly in the mold after mixing silver powder, tungsten carbide powder and additives, and then the contacts can get by sintering and forging and other processes. The advantages of using the process to prepare the kind of contacts are: simple process, easy operation and low requirements for equipment and lower production costs; disadvantages are: the contact material is defective prepared by this process, for example, its density is poor, organization is not even, and arc erosion resistance is poor and so like.

In the on-off process, Ag-WC-C contacts often due to material melting, arc erosion or splashing, making the generation of tungsten trioxide, silver tungstate and some other non-conductive compounds on its surface, leading to the increase of contact resistance, resulting in contact surface temperature increasing greatly, and ultimately affect the on-off performance of contact.



 

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