Matters Needing Attention of Silver Tungsten Contacts Prepared by Infiltration

Matters needing attention of silver tungsten contacts prepared by infiltration are the following:

1. Tungsten powder’s thickness. If tungsten powder is too thin, then, the closed pores inside tungsten porous skeleton will increase, affecting silver (liquid metal) to enter.

2. The structure of tungsten skeleton. Only when the porous tungsten skeleton has interconnected and firm network structure, the prepared silver tungsten contacts can get the best electrical contact performance. Besides, only the tungsten powder having a certain particle size and particle size composition, it will be able to form the desired porous tungsten skeleton structure. It is a network of interconnected and solid particles consisting of tungsten particle and has open pores with smooth surface.

3. Temperature. Temperature will affect the quality of silver tungsten contacts. If the temperature is too high, the viscosity of the liquid will be reduced in favor of infiltration, however, because the surface tension of the liquid is also reduced, so that is detrimental to the infiltration. If the temperature is too low, and after sintering, the porous tungsten skeleton strength decreases, you need to extend the sintering time and is not conducive to economic production.



 

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