摘要
为了研究采用TiO_(2)、WO_(2.72)和炭黑粉末为原料,在惰性气氛下通过碳热还原-碳化制备(Ti,W)C固溶体的过程机理,采用HSC Chemistry热力学分析软件、热重和差示扫描量热分析方法,对物相的演变过程进行分析。结果表明,因球磨导致原料反应活性升高、气-固反应共存等,实际的反应起始温度低于热力学计算值。随温度升高,TiO_(2)和WO_(2.72)分别按TiO_(2)→Ti_(4)O_(7)→Ti_(3)O_(5)→Ti2O_(3)→TiO→TiC和WO_(2.72)→WO_(2)→W→W_(2)C→WC的转变顺序被还原并碳化。为了加速反应的动力学进程,通过碳热还原-碳化制备(Ti,W)C固溶体的最终温度应在1400℃以上。
HSC Chemistry thermodynamic analysis software,thermo-gravimetric and differential scanning calorimetric methods were used to analyze the evolution process of the reduction and carbonization of TiO_(2)and WO_(2.72)by carbon under the condition of an inert atmosphere.The results show that due to the increased reaction activity of the raw materials by ball-milling and the existence of gas-solid synergetic reaction,the actual reaction temperature is lower than the one of the thermodynamic calculation result.As the temperature increases,TiO_(2)and WO_(2.72)are gradually reduced and carbonized in the order of TiO_(2)→Ti_(4)O_(7)→Ti_(3)O_(5)→Ti_(2)O_(3)→TiO→TiC and WO_(2.72)→WO_(2)→W→W_(2)C→WC,respectively.The final reaction temperature is suggested to be above 1400°C to speed up the kinetic process of the reaction.
作者
梁艳
张立
李霞
余鹏
刘涛
凌群
LIANG Yan;ZHANG Li;LI Xia;YU Peng;LIU Tao;LING Qun(State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China;Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen 518055,China)
出处
《粉末冶金材料科学与工程》
EI
2021年第2期91-98,共8页
Materials Science and Engineering of Powder Metallurgy
基金
湖南省自然科学基金资助项目(2019JJ40373)
中南大学中央高校基本科研业务费专项资金资助项目(1053320191447)
国家自然科学基金资助项目(51574292)。
