Abstract
Results are presented from a study of how the thermomechanical properties of specimens of a ceramic based on sodium polyaluminate with the structure of Na-β″-alumina are affected by the ceramic’s microstructure, chemical composition, and phase composition. The range of critical pressure gradients that sharply reduce the strength and service characteristics of specimens of the solid electrolyte is determined. Quantitative estimates are made of the relative change in fracture toughness after thermal shock, the sensitivity of the material to defects, and the degree to which defects accumulate at the root of a notch during thermal shock.
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