碳氮化钒颗粒增强铁基复合材料微观组织的研究

Study on Microstructure of V(C,N) Particulate Reinforced Iron Matix Composite

以钒铁粉、石墨粉、铁粉和氮气为原料,采用粉末冶金技术合成了V(C,N)颗粒增强铁基复合材料,从热力学、热分析、致密化和微观结构等方面对该复合材料进行了研究。结果表明,在烧结温度范围内,发生了FeV+C+N2=V(C,N)+Fe反应,合成了V(C,N)硬质相;制备的复合材料在1200℃烧结时,其密度达到最大值;复合材料主要相为V(C,N)和γ-Fe,所合成的硬质相V(C,N)颗粒细小,在铁基体中分布均匀。

V（C,N） particulate reinforced iron matrix composite was prepared by powder metallurgy technique,using sintering compacts of mixed ferrovanadium powder,iron powder and graphite powder in nitrogen as raw material.The composite was investigated by thermo-dynamics,differential thermal analysis,densifying and microstructure.The results show the reaction（FeV ＋ C ＋ N2 = V（C,N） ＋ Fe） occurs at sintering temperature,and V（C,N） particulates are formed.The density of the synthesized composite is maximum at 1200 ℃.The synthesized composite consists of V（C,N） and γ-Fe,and fine V（C,N） particles homogeneously distribute in the matrix.