Silver Tungsten Points’ Preparation Methods

The silver tungsten points’ preparation methods: infiltration method and re-pressuring method.

1. Infiltration method. Infiltration method is a method of producing refractory metal and. low melting point metal prosthesis alloy Firs of all , to form a porous skeleton, you should press and pre-sinter the metal powder which possess high melting point, secondly, you should control the temperature until its initial temperature is higher than the metal that owns low melting point, then place the metal which has low melting point under/above the porous skeleton, and make the metal melt and immerge porous skeleton’s pores, to get the final product- silver tungsten points which own high density and other good properties.

2. Mechanical alloying. Mechanical alloying, as a new material preparation process, is gradually stepping into people's vision in recent years. And its concept was first put forward in the 1960's. Mechanical alloying has gradually been developed and is widely used nowadays. Mechanical alloying refers to: adopting high-energy ball milling, mixing two or more kinds of elements powder for a long time. Mixing powder will bear attrition force, impact, shear force, compression force and other forces and absorb mechanical energy in this process. In other words, under the role of milling media, after repeatedly pressing, welding, and crushing and fracture process and through solid state reaction or diffusion, the mixing powder will combined with each other to get the result-the product- silver tungsten points.



 

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