Preparation Methods of Silver Tungsten Contacts

The main methods of silver tungsten contacts’ preparation are re-pressuring method and infiltration method.

1. Infiltration method. Infiltration method is a common method of producing low melting point metal prosthesis alloy and refractory metal. Firstly, pressing and pre-sintering the metal powder with high melting point to form a porous skeleton, and then you should control the temperature higher than the metal with low melting point, and put the metal with low melting point below or above the porous skeleton, to make the metal melt and fill the pores of the porous skeleton, to obtain silver tungsten contacts with high density.

2. Mechanical alloying. In recent years, mechanical alloying as a new material preparation process is gradually stepping into people's vision, the concept was first proposed in the 1960's, and now, mechanical alloying has gradually been developed and is widely used. Mechanical alloying refers to mixing two kinds or more kinds of elements powder by high-energy ball milling for a long time., in this process, powder will withstand friction, impact, shear and compression and other forces and absorb mechanical energy, that is to say, under the role of milling media, the mixing powder will be combined with each other after repeatedly pressing, welding, crushing and fracture process and through solid state reaction or diffusion, in order to achieve alloying.



 

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