Effects of Al2O3 addition on the mechanical properties and microstructure of Y-TZP were studied. Specimens of 2.5mol% Y2O3-doped ZrO2 containing 0.375-1.5mol% Al2O3 were prepared by pressureless sintering at 1400°-1550°C, and the density, bending strength, fracture toughness (KIC), Vickers hardness and microstructure were examined. Addition of Al2O3 improved the relative density, bending strength, hardness and fracture toughness. The amount of cubic phase increased with increasing Al2O3 content for specimens sintered between 1500°-1550°C.
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Kihara et al. (1988) studied this question.