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
REACTION DYNAMIC PROCESS AND STRUCTURE FORMING PROCESS INSELFPROPAGATION HIGHTEMPERATURE SYNTHESIS OF TiCFe SYSTEM
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摘要: 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。Abstract: The reaction dynamic process and structure forming process in SHS of TiCFe system were studied using Combustion Front Quenching method and heat analysis method. It was found in the SHS process of the system that Fe2Ti comolten body was formed first, then carbon dissolved to it in high temperature and reacted with it to form TiCx with higher Ti content. After the main reaction carbon continued to react with TiCx through diffusion and formed the titanium carbide with a close stoichiometric ratio. The flow of molten metals resulted in agglomerates in the preheating zone. In the agglomerates small TiC particles were formed. In the period with high temperature after combustion wave the TiC particles continued growing to a larger size.