| 钛、钨氧化物碳热还原-碳化的热力学和热分析 |
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| 引用本文： | 梁艳,张立,李霞,余鹏,刘涛,凌群.钛、钨氧化物碳热还原-碳化的热力学和热分析[J].粉末冶金材料科学与工程,2021(2):91-98. |
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| 作者姓名： | 梁艳 张立 李霞 余鹏 刘涛 凌群 |
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| 作者单位： | 中南大学粉末冶金国家重点实验室;南方科技大学材料科学与工程系 |
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| 基金项目： | 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)。 |
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| 摘 要： | 为了研究采用TiO2、WO2.72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,TiO2和WO2.72分别按TiO2→Ti4O7→Ti3O5→Ti2O3→TiO→TiC和WO2.72→WO2→W→W2C→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。
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| 关 键 词： | (TI W)C WO2.72 碳热还原-碳化 热力学分析 热分析 粉末制备 |
Thermodynamic and thermal analysis on carbothermal reduction-carbonization of titanium and tungsten oxides |
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| LIANG Yan,ZHANG Li,LI Xia,YU Peng,LIU Tao,LING Qun.Thermodynamic and thermal analysis on carbothermal reduction-carbonization of titanium and tungsten oxides[J].materials science and engineering of powder metallurgy,2021(2):91-98. |
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| Authors: | LIANG Yan ZHANG Li LI Xia YU Peng LIU Tao LING Qun |
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| Affiliation: | (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) |
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| Abstract: | 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 TiO2and WO2.72by 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,TiO2and WO2.72are gradually reduced and carbonized in the order of TiO2→Ti4O7→Ti3O5→Ti2O3→TiO→TiC and WO2.72→WO2→W→W2C→WC,respectively.The final reaction temperature is suggested to be above 1400°C to speed up the kinetic process of the reaction. |
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| Keywords: | (Ti W)C WO2 72 carbothermal reduction-carbonization thermodynamic analysis thermal analysis powder preparation |
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