Investigation of High-Alumina Spinel: Effect of LiF and CaCO3 Addition |
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| Authors: | Jow-Lay Huang Si-Yau Sun Yung-Chao Ko |
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| Affiliation: | Department of Materials Science and Engineering, National Cheng-Kung University, Tainan, Taiwan 701, Republic of China;China Steel Corporation, Kaohsiung, Taiwan 812, Republic of China |
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| Abstract: | This work examines the effects of LiF or LiF/CaCO3 additives on the phases, microstructure, sintering temperature, and activation energy of MgO-Al2O3 spinel formation. According to these results, the spinel formation temperature decreases and the spinel phase content increases by incorporating sintering additives. Such an effect is due to the formation of liquid phases at sintering temperatures. The Al composition in spinel is substantially higher in samples containing LiF or LiF/CaCO3 than in samples without sintering additives. Results obtained from the Arrhenius equation and Jander's model indicate that the activation energy for forming spinel decreases by incorporating LiF or LiF/CaCO3. |
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