Nov.-Dec. 1978Yttriu Hydroxy-Salt Binders 481 crocracking was more severe in these compounds and showed a decreasing transition grain size. Extension of the energy criterion for microcracking indicates that the microcracking critical grain size is related to the inverse square of the maximum thermal expansion difference in these compounds. ortimated from Fe2Ti05 0.002 0.003 0.004 0.005 ( Aa )it,, Fig. 3. Variation of transition grain size with thermal expansion anisotropy; transition grain size for A12Ti0, is estimated to be 1-2 p m , compared with the I-pm value of Ref. 10.results in Fig. 3 show that the processing was inadequate for achieving a grain size finer than the estimated transition grain size ( = 1 to 2 pm); thus, microcracking always resulted. Morrow et d.*' pmcessed very fine-grain-size, microcrack-free AIzTiOS by organometallic freeze-drying methods. Holcombe's observations,'" based on their results, substantiate the 1 to 2-pm theoretical prediction, supporting the ACX-~,,,~~ trends based on tne energy criterion for prediction of the grain size for microcracking.
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