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中文摘要：
采用超重力场反应加工技术制备出用于高速切削刀具的自增韧(Ti,W)C-TiB2凝固陶瓷。XRD、FESEM与EDS分析表明,(Ti,W)C-TiB2凝固陶瓷主要由大量细小的TiB2片晶及形状不规则的(Ti,W)C相构成,且TiB2片晶的形成是由其低生长速率的小平面晶体特性所致,而(Ti,W)C的晶体形貌则是由其高生长速率的非小平面晶体特性形成的。陶瓷相对密度、维氏硬度、弯曲强度及断裂韧性分别为98.3%、20.8GPa、(610±25)MPa与12.5MPa·m0.5。FESEM断口分析及裂纹扩展路径观察发现,(Ti,W)C-TiB2凝固陶瓷增韧是通过小尺寸TiB2片晶的裂纹偏转、裂纹桥接及摩擦互锁协同作用予以实现,而陶瓷的优异耐磨性主要取决于高硬度、高模量的细小TiB2基体相片晶。
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