Tungsten Contacts--- Adding Silver, Copper or Tungsten Carbide

Refractory metals tungsten and molybdenum own high hardness, high boiling point, high melting point, wear resistance, anti-welding resistance and other excellent properties, silver and copper own a good thermal conductivity and good electrical conductivity and other excellent performance, tungsten carbide can improve the anti-welding properties of tungsten contacts material and arc erosion resistance properties. Therefore, adding an appropriate amount of silver, copper or tungsten carbide, etc. can greatly improve the performance of the tungsten contacts.

Normally, the preparation process of silver tungsten contacts, copper tungsten contacts and silver tungsten carbide contacts is that: infiltration sintering process. The steps of process is shown as follows: First, pressing tungsten powder and tungsten carbide powder, molding it, and then sintering them, so that tungsten or tungsten carbide can form a porous skeleton, and then immersing molten copper or silver in porous skeleton, copper or silver will soak in skeleton pores due to the capillary action of tungsten or tungsten carbide, thus silver tungsten, copper tungsten or silver tungsten carbide contacts material with high density are available, and for silver tungsten, copper tungsten or silver tungsten carbide contacts with less content of tungsten or tungsten carbide can adopt mixing powder and sintering method.



 

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 Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn

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