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中文摘要：
在（Ti＋B4C）燃烧体系中引入Fe添加剂，采用白蔓延离心熔铸技术制备出含有不同质量分数Fe的TiC-TiB2复相陶瓷。结果表明：TiC-TiB2凝固陶瓷以大量细小TiB2片晶、不规则TiC晶粒及分布于晶间的断续网状Fe黏结相组成。适量Fe的添加，可以加快反应体系组元之间的扩散，促进复相陶瓷内部气体排出与成分均匀化，促使陶瓷致密化、基体晶粒细化、组织均匀性改善，同时作为韧性相，在裂纹扩展过程中又可诱发延性相增韧机制，提高陶瓷的致密度与力学性能，但是过多引入Fe添加剂，将促使TiB2初生相异常长大，劣化陶瓷组织均质性。
英文摘要：
TiC-TiB2 composite ceramics with different Fe mass fractions were prepared via self-propagating high-temperature synthesis centrifugal casting when Fe additives were introduced into the （Ti＋B4C） reaction system. According to the results by X-ray diffraction, field emission scanning electron microscopy and energy dispersive spectrometry, TiC-TiB2 composite ceramics are composed of massive TiB2 platelets and irregular TiC grains as well as a small amount of intermittent net Fe alloy. The appropriate addition of Fe promotes a diffusion between groups and air flow in melting ceramics, resulting in the grain refinement, densification and mierostructure homogenization of the ceramics. The existence of ductile phase induces ductile phase toughening mechanism in the process of crack propagation. Therefore, the densification and mechanical properties of TiC-TiB2 composite ceramics are improved. However, the abnormal growth of TiB2 primary phase can deteriorate the microstructure homogenization in the case of the excess amount of Fe powder.
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