SPS制备致密钨块及添加碳化钽对致密化的影响
Preparation of Dense Tungsten Block by SPS and Effect of TaC on Densification of Sintered Tungsten
马明亮, 沈卫平, 王青云, 张庆玲
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作者单位：(北京科技大学 核材料研究所 特种陶瓷粉末冶金研究室, 北京 100083)
中文关键字：钨； 放电等离子烧结； 碳化钽； 活化烧结
英文关键字：tungsten (W); SPS; TaC; active sintering
中文摘要：使用放电等离子烧结(SPS)制备了高密度钨块，不加入碳化钽的试样最高相对密度可达96.4%；加入碳化钽的试样最高相对密度可达98.6%。研究了钨粉粒度和碳化钽对钨块致密化和晶粒大小的影响。结果表明，初始钨粉粒径越小，制备得到钨块的密度越小，晶粒平均直径也越小；加入的碳化钽能起到活化烧结和细化晶粒的作用。使用颗粒粒径处于不同量级的钨粉制备钨块，其烧结收缩曲线具有不同的变化趋势。
英文摘要：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.