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| Study on Electrochemical Preparation of Si-Ti Alloy from SiO2/TiO2 in Molten Salt |
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Received:September 05, 2019
Revised:September 09, 2019
Accepted:September 10, 2019
Published Online:December 18, 2019
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| DOI：doi：10.3969/j.issn.1007-7545.2020.01.008 |
| KeyWord:TiSi2/Si; Si-Ti alloy; molten salt electrolysis |
| Author | Institution |
| ZHOU Zhong-ren |
昆明理工大学 冶金与能源工程学院;锂离子电池及材料国家地方联合工程实验室 |
| ZHANG Ying-jie |
昆明理工大学 冶金与能源工程学院 |
| HUA Yi-xin |
昆明理工大学 冶金与能源工程学院 |
| DONG Peng |
昆明理工大学 冶金与能源工程学院 |
| ZHANG Yi-yong |
昆明理工大学 冶金与能源工程学院 |
| MENG Qi |
昆明理工大学 冶金与能源工程学院 |
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| Abstract: |
| Silicon-titanium alloy was prepared by direct electrolysis of SiO2 and TiO2 mixture through molten salt electrolysis. According to thermodynamic calculation, theoretical decomposition voltage of SiO2 and TiO2 at 700 ℃ is 1.28 V and 1.37 V respectively. Reduced metallic Si and Ti can react spontaneously to form Si-Ti alloys at high temperature, and stable TiSi2 alloy phase is produced more easily than other alloyed phases. Experimental results suggest that TiSi2/Si can be produced applying SiO2/TiO2 with molar ratio of 50︰1 as raw material in equimolar CaCl2-NaCl molten salt under 2.4 V cell voltage at 700 ℃ for 5 h. Morphology of TiSi2/Si is accumulation of porous particles with particle size of 0.2~2.5 μm, and metallic silicon covers surface of TiSi2 alloy. |
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