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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。
The thermodynamics of reaction system of nitrogen-containing ferro-vanadium alloy prepared by liquid nitriding method was studied by FactSage software. The calculation results show that the content of N in FeV50 alloy reaches the highest at 1823 K, the mass concentration is 10.64%, and the remaining 34 mol% liquid phase is the best, while 1823 ~ 1873 K is the optimum for the nitriding of FeV50 Temperature, at this temperature, vanadium preferentially combined with nitrogen to form V13N6 phase, and then generate VN phase. On the basis of thermodynamic calculation, the high-temperature nitriding experiment of tube furnace with 1873 ~ 1923 K FeV50 alloy was taken as raw material to prepare a nitrogen-containing ferro-vanadium alloy with the highest nitrogen content of 4.34%. XRD and SEM analysis showed that the main phase composition of the ferro-nitrogen-containing vanadium-iron alloy is V, Fe, V2N, VN, V5O9 and SiO2. The nitrides are uniformly distributed in the vanadium-rich phase in the form of V2N and VN. Experiments show that the use of liquid nitriding ferrous vanadium production is feasible.