Carbothermal Reduction of Alumina in a Vacuum
The carbothermal reduction of alumina in a vacuum was investigated by XRD and thermodynamic analysis. Experiments on mixtures of alumina and graphite in a vacuum furnace at 1743-1843K proved that the residues consisted of Al2O3and C, and the deposits formed on the upper wall of the crucible contained Al4O4C, C, Al4C3 and Al2O3. Thermodynamic analysis indicated that alumina should react with carbon to form gaseous Al2O and Al above 1671K and 1713K at 100Pa respectively, Al2O and Al react back with CO to form Al4O4C, C, Al4C3 and Al2O3, which constitute deposits.
Jingtao Han, Zhengyi Jiang and Sihai Jiao
Y. B. Feng et al., "Carbothermal Reduction of Alumina in a Vacuum", Advanced Materials Research, Vols. 156-157, pp. 1688-1691, 2011