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

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。

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.