中文摘要：

采用高温高压烧结方法,烧结纯钨和TiC颗粒弥散增强W-TiC合金材料,对钨及W-TiC合金的烧结致密化行为和力学性能进行了研究。结果表明：在压力为5.0GPa、温度为1 500℃的条件下烧结15min可获得良好的烧结样品,块体钨的致密度达到99.3%,硬度达到6.43GPa;在相同的高温高压烧结条件下,添加质量分数为1.5%的TiC,获得的W-TiC合金致密度达到99.0%,硬度达到7.58GPa。极端高压环境不但能抑制钨及钨合金在烧结过程中的晶粒长大,还能降低烧结温度,提高烧结效率,增加烧结体的致密性。在此基础上进一步探索了钨及钨基合金W-TiC的高压烧结动力学、微观结构、机械性能与烧结压力和烧结温度的关系。

英文摘要：

The pure bulk tungsten and W-TiC alloy were sintered by high-pressure and high-tempera- ture （HPHT） method,and their densification behavior and hardness were systematically investigated. It is found that the pure tungsten sample sintered at the circumstance of 5.0 GPa and 1 500 ℃ for 15 rain exhibits unique properties, its relative density and hardness are as high as 99. 3% and 6.43 GPa,respectively. Moreover, the values for W-TiC alloy with TiC mass fraction of 1. 5% are 99.0% and 7.58 GPa respectively under the same sintering conditions. It is concluded from the experi- mental results that the HPHT sintering method plays an important role in the aspects of accelerating the densification, improving the sintering efficiency and bringing down the sintering temperature. Furthermore,the relations of the sintering kinetics, microstructures and the evolutions of mechanical properties versus pressure and temperature were all explored for tungsten and W-TiC alloy.