The designing and the powder metallurgical fabrication of molybdenum/zirco nia functionally gradient material for high temperature use has been described. The process includes the precise control of the sintering rates of metal and ceramic powder mixtures, the determination of the thermal expansion coefficients and theelastic moduli, as well as the breaking strenght of the two phase composites, and the designing of the optimum compositional distribution on the basis of the finite element analysis of thermal stress, which is generated upon cooling from sintering temperature.According to the optimum compositional gradient the sintered compact of the functionally gradient material of the combination of molybdenum and zirconia was successfully fabricated. The synthetic composite showed uniform structural transition from metal to ceramic phase and included neither thermal-stress crack nor microstructural defects.
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Watanabe et al. (1988) studied this question.