Accession Number : AD0432276


Title :   ELASTIC PROPERTIES OF MAGNESIA AND MAGNESIUMALUMINATE SPINEL.


Descriptive Note : Final summary rept.,


Corporate Author : STATE UNIV OF NEW YORK ALFRED COLL OF CERAMICS


Personal Author(s) : CHUNG,D H ; Terwilliger,G R ; Crandall,W B ; Lawrence,W G


Report Date : 29 Feb 1964


Pagination or Media Count : 89


Abstract : 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)


Descriptors :   *SPINEL , *ALUMINUM COMPOUNDS , ELASTIC PROPERTIES , ELASTIC PROPERTIES , MAGNESIUM COMPOUNDS , OXIDES , ANISOTROPY , MEASUREMENT , TEMPERATURE , POROSITY , DENSITY , CHEMICAL ANALYSIS , X RAY DIFFRACTION , CRYSTAL LATTICES , CRYSTAL STRUCTURE , THERMAL EXPANSION , HIGH TEMPERATURE , SCIENTIFIC RESEARCH , CRYOGENICS


Distribution Statement : APPROVED FOR PUBLIC RELEASE