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以超重力下燃烧合成方式原位合成出TiC基金属陶瓷,并研究了复合陶瓷显微组织与生成机理。XRD,FESEM与EDS分析结果表明,陶瓷基体主要由TiC球晶相组成,同时在两相间还分布着少量的WB与ε-(Ti,W)C以及含量更少的Fe6W7、Al2 O3与ZrO2。TiC基复合陶瓷的形成主要为三个阶段:一是在超重力作用下,燃烧反应快速进行,迅速获得全液相产物;二是超重力促使氧化物液相发生Stocks迁移,从而得到Ti-W-Fe-C-B合金液相;最后,TiC在Ti-W-Fe-C-B合金液相的冷却过程中优先形核、析出。
The TiC-based cermets were synthesized in-situ by combustion synthesis under super gravity, and the microstructure and formation mechanism of the composite ceramics were also studied. The results of XRD, FESEM and EDS show that the ceramic matrix mainly consists of TiC spherulites with a small amount of WB and ε- (Ti, W) C and less Fe6W7, Al2 O3 and ZrO2 distributed between the two phases. The formation of TiC-based composite ceramic is mainly three stages: First, under the action of super-gravity, the combustion reaction proceeds rapidly to obtain the full liquid phase product; second, the super-gravity forces migration of Stocks in the oxide liquid phase to obtain Ti-W -Fe-CB alloy liquid phase; finally, TiC preferentially nucleates and precipitates during the cooling of the Ti-W-Fe-CB alloy liquid phase.