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采用燃烧波峰铜楔块淬熄法和热分析法,研究Ti-C-Fe体系自蔓延高温合成的反应动力学过程和结构形成过程。在该体系SHS过程中,首先形成Fe、Ti低共熔体,C在高温下溶解于熔体之中,进而形成富Ti的TiCx。在主波峰后C继续通过扩散与TiCx反应形成接近化学计量比的TiC。熔融金属的流动导致大团聚体形成,在团聚体内反应形成小颗粒TiC,在燃烧波过后的持续高温阶段,TiC粒子继续长大
The reaction kinetics and structure formation of self-propagating high-temperature synthesis of Ti-C-Fe system were studied by means of combustion peak wedge quenching and thermal analysis. In the SHS process of the system, Fe and Ti eutectic are formed first, and C is dissolved in the melt at a high temperature to form Ti-rich TiCx. After the main peak, C continues to react with TiCx to form near-stoichiometric TiC by diffusion. The flow of molten metal leads to the formation of large agglomerates that react to form small particles of TiC in the agglomerates, and the TiC particles continue to grow in the sustained high temperature phase after the combustion wave has passed