用一种将粉末冶金和原位合成相结合的全新方法原位合成了V8C7颗粒增强铁基复合材料,对其微观组织、耐磨性及其磨损机理进行了分析,并探讨了Fe-V-C三元体系原位合成V8C7的机理. 结果表明:石墨的存在降低了σ-(FeV)相的稳定性, 使其分解为固溶大量V的α-Fe,C与V发生碳化反应生成V8C7; 原位合成的V8C7颗粒增强铁基复合材料由增强相V8C7和α-Fe相组成, V8C7颗粒均匀分布在珠光体基体上;在重载干滑动摩擦条件下,V8C7颗粒增强铁基复合材料显示出良好的耐磨性能.
Using powder metallurgy technology, the system of (FeV+graphite) finished carbonized reacts and VC iron matrix composite fabricated in situ in vacuum furnace. SEM，XRD and TEM were used to examine the structure and phase of composite. The wear-resistance of VC iron matrix composite was examined on a MM-200 wear-test machine. It was confirmed that graphite reduced the stability of σ-（FeV）, and σ-（FeV）decomposed small quantity of α-Fe and V at 1073K.The composite was mainly made of VC particles and α-Fe, and displayed good wear-resistance under dry sliding with heavy load.
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