原位合成TiC颗粒增强铁基复合材料热、动力学的研究
Research on Thermodynamics and Kinetics of In-situ Synthesized TiC /Fe Composite Coating Prepared by Laser Cladding
王建斌1 , 许云华2, 李成晨2 , 吴天栋1
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作者单位：(1.西安建筑科技大学 材料科学与工程学院, 陕西 西安 710055; 2. 西安建筑科技大学 机电工程学院, 陕西 西安 710055)
中文关键字：铸渗复合； 原位合成； TiC； 复合材料
英文关键字：casting and heat treatment; in-situ synthesized; TiC; composites
中文摘要：采用铸渗复合原位反应技术制备TiC颗粒增强铁基复合材料，用SEM、XRD对复合材料的显微组织和物相组成进行观察分析，应用热、动力学原理对原位合成TiC的热、动力学过程进行了分析。热力学计算结果表明，在1138 ℃热处理能够原位合成TiC，体系中TiC优先于Fe3C和Fe2Ti形成，且在热力学上比Fe3C和Fe2Ti稳定。动力学分析结果表明，Ti-C反应受动力学过程控制，C的扩散是反应的控制步骤。
英文摘要：n-situ synthesized TiC particulates reinforced iron matrix composites were prepared with the method of casting and heat treatment. The microstructure of the composite was analyzed by SEM, XRD. The mechanism of TiC fabricated by in-situ synthesis was analyzed by thermodynamics and kinetics principles. Thermodynamics calculation results show that TiC can be produced by in-situ synthesis sintering at 1138 ℃. The formation of TiC is ahead of the formation of Fe3C and Fe2Ti. TiC is more stable than Fe3C and Fe2Ti in thermodynamics. Kinetics analysis results show that Ti-C reaction is controlled by kinetic process, the diffusion of C atom could control the reaction step.