V(C,N)颗粒增强铁基复合材料的研究
Study on Iron Matrix Composites Reinforced by V(C,N) Particles
林阳军1, 徐小玉2, 朱国女2
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作者单位：1. 成都电子机械高等专科学校 机械工程系, 四川 成都 610031; 2. 西安铁路局 兴平养路机械厂, 陕西 兴平 713100
中文关键字：粉末冶金； 原位合成； 复合材料； 微观组织
英文关键字：powder metallurgy; in-situ synthesis; composite; microstructure
中文摘要：采用粉末冶金和原位合成相结合的方法合成V(C，N)颗粒增强铁基复合材料，用扫描电镜、X射线衍射等测试方法对试样进行了组织结构分析，并探讨了原位合成V(C，N)的机理。结果表明，石墨与氮气的存在降低了σ-FeV相的稳定性，使其分解为固溶大量V的Fe，C、N与V发生反应生成V(C，N)；原位合成的复合材料主要相组成为V(C，N) 和γ-Fe，所合成的硬质相V(C，N)颗粒细小，在铁基体中均匀分布。 在重载干滑动摩擦条件下，V(C，N)颗粒增强铁基复合材料显示出良好的耐磨性。
英文摘要：A process which combines in-situ synthesis with powder metallurgy technique was used to produce V(C, N) particulates reinforced iron matrix composite. The microstructure of the composite was investigated using XRD and SEM. The reaction princple of V(C, N) formed by in-situ synthesis was also discussed. The results show that graphite and nitrogen reduce the stability of σ-FeV, and σ-FeV decomposes into Fe in which V atoms dissolve. The synthesized composite consists of V(C, N) and γ-Fe, and spherical V(C, N) particles exhibit finer size and homogeneous distribution in the matrix. Under the condition of dry sliding with heavy loads, the V(C, N)/Fe composite holds great wear-resistance.