GRAIN SIZE EFFECTS ON THE THERMAL CONDUCTIVITY OF CERAMIC OXIDES
STATE UNIV OF NEW YORK ALFRED COLL OF CERAMICS
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Dense, fine grained alumina samples were employed in a study of the effect of grain size on thermal conductivity in polycrystalline alumina. Thermal conductivity in the range 100 to 1000 C decreased slightly but significantlyAS THE AVERAGE GRAIN SIZE WAS VARIED FROM 10 TO 4 TO 2 THIS EFFECT FOLLOWED CLOSELY AN ADDITIVE RECIPROCAL VOLUME RELATIONSHIP. The role of impurities in masking this effect in dense alumina samples of purity exceeding 99 was shown. Strength and modulus of elasticity measurements were made of Al2O3 and MgO. Dense samples of MgO were produced by using hot pressing techniques.