The synthesis of thermal‐shock‐resistant material from zirconyl phosphate, 2ZrO 2 P 2 O 5 , was investigated. Modifications of the compound were examined; only the a phase appears to be thermodynamically stable. Sintering of a‐phase powder to a dense ceramic was promoted by adding a metal oxide. Crystalline zirconyl phosphate has a low average thermal expansion coefficient. The relation of microcracking to grain size and strength was studied using specimens sintered under varied conditions. A strong low‐thermal‐expansion polycrystalline ceramic was obtained by controlling grain growth.
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Yamai et al. (1985) studied this question.
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