摘要
对以五氧化二钒为原料制备碳化钒的工艺过程进行热力学分析,分析结果表明:钒氧化物在转化过程中遵循逐级还原理论;钒氧化物在碳化过程中,不转化为金属钒,直接转化为碳化钒;二氧化钒的碳化温度最低,为1018K,因此,在钒氧化物的转化过程中,应尽可能使其转化为二氧化钒。若采用气相还原碳化的方法,则可通过调节气体的流量、配比对还原碳化工艺进行控制。
In this paper, the producing process of preparation of VC using V2O5 as raw material was analyzed by means of thermadynamical analysis. The results identify that the process of conversion of vanadium oxides, convertion abides by the principle of reduction step by step. In the process of carburation, the vanadium oxides are directly converted into VC rather than V for the convenience of subsequent process, V2O5 should be converted into VO2 as soon as possible. The gas carburations can modify the process of carburation by moderating the flow rate of gas and gas ratio.
出处
《粉末冶金材料科学与工程》
EI
2004年第3期192-196,共5页
Materials Science and Engineering of Powder Metallurgy
关键词
氧化钒
碳化钒
直接碳化法
热力学分析
vanadium oxide
vanadium carbide
direct carburation
thermadynamical analysis
