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

Tungsten and molybdenum possess wear resistance, high boiling point, high hardness, anti-welding resistance, high melting point and other excellent properties. Silver and copper posses good electrical conductivity and good thermal conductivity and other properties. Tungsten carbide can improve the arc-erosion resistance and anti-welding properties of tungsten points’ material and others. So the performance of tungsten points can be improves greatly by adding an appropriate amount of copper, silver or tungsten carbide and other elements.
The copper tungsten points, silver tungsten points and silver tungsten carbide points can usually be prepared by infiltration sintering process. The processes can be seen as bellow:
press tungsten or tungsten carbide powder, and then mold it, then sinter it, therefore, a porous skeleton of tungsten or tungsten carbide can be formed. And then immerse molten silver or copper in porous skeleton, so due to the capillary action of tungsten or tungsten carbide, they will soak in skeleton pores. After that copper tungsten, silver tungsten or silver tungsten carbide points materials which own high density can be available. For copper tungsten, silver tungsten or silver tungsten carbide points material which own less tungsten or tungsten carbide content can use mixing and sintering process.

 

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