采用FactSage软件对液相渗氮法制备含氮钒铁合金反应体系的热力学进行研究.计算结果表明,在1823 K温度下,FeV50合金中N元素含量可达到最高,质量浓度为10.64％,并且可剩余34 mol％左右的液相,1823 ～1873 K为FeV50液相渗氮的最佳温度,在此温度下,钒优先与氮结合生成V13N6相,然后生成VN相.在热力学计算的基础上,以FeV50合金为原料进行1873 ～1923 K下管式炉高温渗氮实验,制备出氮含量最高为4.34％的含氮钒铁合金.XRD和SEM分析显示含氮钒铁合金中主要相组成为V,Fe,V2N,VN,V5O9和SiO2,氮化物以V2N和VN的形式均匀分布在富钒相中.实验证明利用液相渗氮法生产含氮钒铁具有可行性.
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