Preparation of Dense Tungsten Block by SPS and Effect of TaC on Densification of Sintered Tungsten
Dense tungsten block was successfully prepared by a spark plasma sintering process.The highest relative density of pure tungsten block is 96.4%,and that of tungsten block with TaC is 98.6%.The effects of particle size of tungsten powders and TaC quantity on densification and grain size were investigated.The results show that the smaller the particle size of tungsten powders,the lower the density and the smaller the grain size of the sintered tungsten block.The added TaC and activate sintering and refine grain size in sintered tungsten block.The sintering shrinkage curves of tungsten powders with different particle size have different trends.