INVESTIGATION OF HIGH-ALUMINA SPINEL - EFFECT OF LIF AND CACO3 ADDITION

This work examines the effects of LiF or LiF/CaCO3 additives on the ph ases, microstructure, sintering temperature, and activation energy of MgO-Al2O3 spinel formation. According to these results, the spinel for mation temperature decreases and the spinel phase content increases by incorporating sintering additives. Such an effect is due to the forma tion 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 th e Arrhenius equation and Jander's model indicate that the activation e nergy for forming spinel decreases by incorporating LiF or LiF/CaCO3.