Notes of Silver Tungsten points Prepared by Infiltration

Notes of silver tungsten points prepared by infiltration are shown as follows:

1. The thickness of the tungsten powder. The closed pores inside tungsten porous skeleton will increase and then influence silver (liquid metal)’s entry if tungsten powder is too thin.

2. The structure of tungsten skeleton. The silver tungsten points could get the best electrical contact performance as the porous tungsten skeleton has firm and interconnected network structure. Besides, it can form the desired porous tungsten skeleton structure when the tungsten powder possesses a certain particle size and particle size composition. It is a network of firm and interconnected tungsten particles and has open pores with smooth surface.

3. Infiltration temperature. Infiltration temperature will have an effect on the quality of silver tungsten points. The viscosity of the liquid will be reduced to benefit infiltration if the temperature is too high. However, it is detrimental to the infiltration because the surface tension of the liquid is also reduced. The porous tungsten skeleton strength after sintering will decrease if the temperature is too low. And you should prolong the sintering time to make it be conducive to economic production.



 

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