Microstructure and Mechanical Properties of in Situ Al_2O_(3pl)/Ce-TZP Composites

The microstructure and mechanical properties of in situ A12O3 platelet/Ce-TZP composites were studied. The results indicate that both the strength and fracture toughness of the composites can be increased by introduction of in situ Al2O3 platelets if sintered at a suitable temperature. The reinforcement is most effective for the specimens containing 15 vol% Al2O3 while the toughening effects are better than the strengthening. The mechanical properties of the composites decrease if the sintering temperature is too low or the Al2O3 content is too high. The toughening mechanisms in the composites include transformation toughening and platelet reinforcement. They are enhanced by their co-operation.