原位合成TiC/Fe基复合材料的组织结构和磨损性能

Microstructure and Wear Property of TiC Particles Reinforced Iron Matrix Composite Produced In-situ

利用粉末冶金技术,在真空状态下使Fe-Ti-C体系进行碳化反应原位合成TiC/Fe基复合材料,用扫描电镜(SEM)、X射线衍射(XRD)分析复合材料的组织结构和相组成,用热分析法和高温X射线衍射研究Fe-Ti-C体系原位合成的反应机理,用MM-200磨损试验机对复合材料进行耐磨性实验。研究结果表明,反应合成的复合材料主要相组成为TiC、α-Fe和Fe3C,所合成的硬质相TiC颗粒细小,在铁基体中均匀分布。三元体系Fe-Ti-C的反应机理为,首先在765.6℃发生Fe的同素异构转变,即α-Feγ-Fe;其次在1078.4℃,Ti与Fe共熔而形成低共熔体Fe2Ti;最后在1138.2℃,C与Fe2Ti反应生成TiC。在重载干滑动磨损条件下此复合材料显示了很好的耐磨性能。

Using powder metallurgy technique,the TiC/Fe matrix composite was fabricated in situ.The microstructure of the composite was investigated using X-ray diffraction(XRD) and scanning electron microscope(SEM).The differential thermal analysis(DTA) and high-temperature X-ray diffraction were applied to study the reaction principle of the Fe-Ti-C system.The wear-resistance of TiC/Fe matrix composite was examined on a MM-200 wear-test machine.The results showed that the synthesized composite consists of fine TiC p...