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
作者：王静(成都电子机械高等专科学校 机械工程系，四川 成都 610031)；伏思静(成都电子机械高等专科学校 机械工程系，四川 成都 610031)；丁义超(成都电子机械高等专科学校 机械工程系，四川 成都 610031)
Author：(Mechanical Eng. Dept., Chengdu Electromechanical College, Chengdu 610031, China)；(Mechanical Eng. Dept., Chengdu Electromechanical College, Chengdu 610031, China)；(Mechanical Eng. Dept., Chengdu Electromechanical College, Chengdu 610031, China)
收稿日期：2007-11-21 年卷（期）页码：2008,40(5):111-115
期刊名称：工程科学与技术
Journal Name：Advanced Engineering Sciences
关键字：原位合成；TiC/Fe基复合材料；微观组织；反应机理；耐磨性
Key words：in situ synthesis; TiC/Fe matrix composite; microstructure; reaction principle; wear resistance
基金项目：科技部中小企业创新基金资助项目（01C26225111100955）
中文摘要
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。
英文摘要
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 particles, Fe3C andα Fe as the binder phase. TiC particles exhibit fine size and homogeneous distribution in the matrix.The reaction principle is as follows: first, allotropic changing α Feγ Fe at 765.6 ℃; secondly, the formation of compound Fe2Ti at 1078.4 ℃ through the eutectic reaction between Ti and Fe; thirdly, thereaction between carbon and melted Fe2Ti causing the formation of TiC at 1138.2 ℃. Under the condition of dry sliding with heavy loads, TiC/Fe matrix composite shows better wear-resistance.
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