| In the case of liquid phase sintering, the role of liquid is of great significance, since the liquid flow enhances the mass transport. And as many sintering mechanisms are involved, it is difficult to observe only one mechanism in the liquid phase sintering. In the experiment, W-Cu system with mutually insoluble component had been chosen in which the solution and recipitation does not occur, and the rearrangement of W particles had been observed in W-Cu system. The main results are summarized as follows. Liquid phase sintering occurs by the liquid coagulation and outward expansion of the dense region with the increase of sintering time. Raising the temperature increases the shrinkage of specimens. With the increase in liquid contents and the decrease in the particle size, relative density and shrinkage are increased. The disintegration of polycrystalline and agglomerated powders had been observed. |
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