Strengthening Oxides by Reduction of Crystal Anisotropy.
CERAMIC FINISHING CO STATE COLLEGE PA
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In single phase polycrystalline ceramic bodies composed of anisotropic crystals the stresses resulting from applied loads, large scale residual stresses and localized stresses combine to cause fracture. The localized stresses caused by crystal anisotropy are substantial in magnitude and in large grain size bodies cause local crack formation even in the absence of an applied load. In earlier investigations compositions with reduced thermal anisotropy were made by solid solution additions. In the present investigation the flexural strengths of alumina ceramics, and of a composition in the system Al2O3-Cr2O3 having reduced thermal anisotropy, were compared over a range of grain sizes in the machined and quenched conditions. The fracture surfaces were studied. Very high strengths were observed. Author
- Ceramics, Refractories and Glass