摘要：以偏钒酸铵、石墨和钛粉为原料,采用碳热还原反应合成碳化钒钛粉体,借助热重-差热分析、X射线衍射、扫描电镜等分析方法对制备碳化钒钛的合成过程以及物相演变进行了研究。结果表明:反应温度和配碳量对碳化钒钛的形成有较大的影响,配碳量增加有利于加快碳热还原反应进程,当产物中碳含量偏多时,VC和TiC以混合物的形式存在,不形成TiVC₂固溶体;当反应温度高于1 500℃以及碳的质量分数为24.66%时,VC和Ti C能够形成TiVC₂固溶体。

关键词：碳热还原；碳化钒钛；固溶体

Abstract： Titanium vanadium carbide powders were synthesized by carbothermic reduction process, using ammonium metavanadate, graphite and titanium as raw materials. The reaction process and phase evolution during preparing titanium vanadium carbide were investigated using TGDSC, XRD and SEM. The results show that the reaction temperature and carbon contents have great influence on formation of TiVC₂. Increasing the carbon contents is benefit to accelerate the carbothermic reaction process. When the carbon content is higher, the products are VC and TiC. When the reaction temperature is higher than 1 500 ℃ and the carbon content is lower than 24.66%, TiVC₂ solid solution can be obtained. 

Keywords: carbothermic reduction; titanium vanadium carbide; solid solution