ELASTIC PROPERTIES OF MAGNESIA AND MAGNESIUMALUMINATE SPINEL

ELASTIC PROPERTIES OF MAGNESIA AND MAGNESIUMALUMINATE SPINEL

The elastic moduli for single-crystal magnesium oxide were evaluated for the temperature range of 80 to 1600 K. The isotropic Young's 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 elast...

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Bibliographische Detailangaben
Hauptverfasser: CHUNG,D H, Terwilliger,G R, Crandall,W B, Lawrence,W G
Format: Report
Sprache:eng
Schlagworte:
ALUMINUM COMPOUNDS
ANISOTROPY
CHEMICAL ANALYSIS
CRYOGENICS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DENSITY
ELASTIC PROPERTIES
HIGH TEMPERATURE
MAGNESIUM COMPOUNDS
MEASUREMENT
OXIDES
POROSITY
SCIENTIFIC RESEARCH
SPINEL
TEMPERATURE
THERMAL EXPANSION
X RAY DIFFRACTION
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Zusammenfassung:The elastic moduli for single-crystal magnesium oxide were evaluated for the temperature range of 80 to 1600 K. The isotropic Young's 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 1:1, 1:2, 1:2.65, 1:3, and 1:3.5 mole ratios. Young's modulus as a function of temperature was determined for the spinels having compositions of 1:1, 1:2.65, and 1:3.5 mole ratios of magnesia to alumina. The results are discussed with respect to the effects of porosity, composition, and temperature. (Author)