Pressing Process Effect on Tungsten Copper Electrode Properties III

The volume shrinkage of tungsten skeleton infiltrated with increasing compacts after pressing force increases, after its infiltration volume shrinkage greater than shrinkage skimmed skeleton after sintering blanks. As the result of the main ingredient of compact is tungsten and a slight amount of copper-induced, when skimmed blank sinter at high temperature, volume shrinkage mainly by volume diffusion effects and some tungsten particles induced copper compacts pressing pressure, which is conducive mutual contact between the tungsten particles and the diffusion and sintering density improving

However, if the pressing pressure exceeds a certain limit, the tungsten particle volume shrinkage decreases. It occurs liquid phase sintering during copper-tungsten skeleton infiltration. By the action of capillary force, tungsten particles rearranges, and improves the density, the volume shrinkage caused much greater than the volume shrinkage by volume diffusion.

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