Abstract
The sintering rate of calcium oxide in a nitrogen atmosphere was measured at temperatures from 700 to 1100°C. CaO prepared from ultrapure CaCO 3 was compared with impure CaO derived from limestone and calcium hydroxide. CaCO 3 derivatives yielded an initial surface area of 104m 2/g and the hydroxides, 76.7m 2/g. The rate of surface reduction was independent of particle size between 2 and 20 μm, but strongly dependent on temperature and impurities. Impurities increased the rate of sintering at a given temperature and reduced the activation energy. The model of German and Munir (J. Am. Ceram. Soc., 59, 379-383, 1976) correlates the kinetics of surface reduction and identifies lattice diffusion as the mechanism of solid transport. Porosity declined logarithmically with time during the intermediate stage of sintering.
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