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| Kinetic Study on Preparation of Titanium Oxycarbide by Vacuum Thermal Reduction |
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Received:September 22, 2013
Revised:September 24, 2013
Accepted:September 29, 2013
Published Online:February 25, 2014
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| DOI：10.3969/j.issn.1007-7545.2014.03.014 |
| KeyWord:titanium oxycarbide; dynamics; reduction process; apparent activation energy |
| Author | Institution |
| ZHU Fu-xing |
攀钢集团研究院有限公司 |
| Deng bin |
攀钢集团研究院有限公司 |
| QIN Qing-dong |
中国铝业股份有限公司郑州研究院 |
| WANG Fang-ping |
中国铝业股份有限公司郑州研究院 |
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| Abstract: |
| The process and dynamic condition of TiO2 carbothermic reduction were studied by non-isothermal solid model. The results show that carbothermic reduction process is divided into four stages. C and TinO2n-1（n≥5）are the main phases of the first stage (1 373~1 523 K), which gradually change into C, TiC0.5O0.5 and TinO2n-1（2≤n≤4）at the second stage (1 523~1 673 K). C, Ti2O3 and TiC0.5O0.5 are the main phases of the third stage（1 673~1 833 K）, which finally change into TiC0.5O0.5 at the fourth stage (1 833~1 973 K). The kinetic equation of the first stage presents as , which is controlled by one-dimension diffusion with apparent activation energies of 113.55 kJ/mol. The kinetic equation of the second stage presents as , which is controlled by the second-order reaction with apparent activation energies of 303.36 kJ/mol. Temperature exerts significant influence in this stage. The kinetic equation of the third stage presents as , which is controlled by 1.5-order reaction with apparent activation energies of 53.93 kJ/mol, and this stage is limited by inadequate reducing agent. The kinetic equation of the last presents as , which is controlled by three-dimension diffusion with apparent activation energies of 99.22 kJ/mol, and this stage is mainly restricted by the loosing structure of product. |
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