ELASTIC PROPERTIES OF MAGNESIA AND MAGNESIUMALUMINATE SPINEL.
Final summary rept.,
STATE UNIV OF NEW YORK ALFRED COLL OF CERAMICS
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The elastic moduli for single-crystal magnesium oxide were evaluated for the temperature range of 80 to 1600 K. The isotropic Youngs modulus and shear modulus of dense-formed polycrystalline magnesia were measured over the temperature range of 298 to 1600 K. The data on the singlecrystal elastic constants were compared with the measured polycrystalline isotropic moduli on the basis of the Voigt-Reuss-Hill approximation. Dense-formed specimens of magnesium-aluminate spinel with varying mole ratios of magnesia to alumina were prepared under controlled conditions. The room temperature values of the elastic moduli spinel compositions having 11, 12, 12.65, 13, and 13.5 mole ratios. Youngs modulus as a function of temperature was determined for the spinels having compositions of 11, 12.65, and 13.5 mole ratios of magnesia to alumina. The results are discussed with respect to the effects of porosity, composition, and temperature. Author