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| Study on Aluminum Thermo-Reduction in K3AlF6-Sc2O3 System |
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Received:November 01, 2012
Revised:November 01, 2012
Accepted:November 02, 2012
Published Online:February 19, 2013
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| DOI：10.3969/j.issn.1007-7545.2013.03.007 |
| KeyWord:scandium oxide; aluminum thermo-reduction; Al3Sc; free energy; Al-Sc alloy |
| Author | Institution |
| LIU Qiao-chu |
北京科技大学 冶金与生态工程学院 |
| XUE Ji-lai |
北京科技大学 冶金与生态工程学院 |
| ZHU Jun |
北京科技大学 冶金与生态工程学院 |
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| Abstract: |
| Al-Sc alloy was prepared in K3AlF6-Sc2O3 melt system by aluminum thermo-reduction and electrolysis process respectively. Thermodynamic analysis shows that Sc2O3 can be reduced by aluminum when Al3Sc phase is included with an introduction of free energy and activity. The results show scandium content of the alloy from electrolysis process reaches 0.97% at 750 ℃ in K3AlF6-2%Sc2O3 (CR=1.22) melt system, while that of the alloy from aluminum thermo-reduction may be limited to 0.18%. Scandium content changes little with an increase of Sc2O3 concentration in the melt and prolonged reaction time. Scandium is better distributed in electrolysis-made alloy than that in thermo-reduction. Scandium mainly exists in the edge area of alloy samples. |
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