钛、钨氧化物碳热还原-碳化的热力学和热分析  

Thermodynamic and thermal analysis on carbothermal reduction-carbonization of titanium and tungsten oxides

作　　者：梁艳 张立[1] 李霞 余鹏 刘涛[1] 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)

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083 [2]南方科技大学材料科学与工程系,深圳518055

出　　处：《粉末冶金材料科学与工程》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)。

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.

关 键 词：(TI W)C WO_(2.72) 碳热还原-碳化 热力学分析 热分析 粉末制备 

分 类 号：TG178[金属学及工艺—金属表面处理]