Abstract
Y 2O 3 and Nb 2O 5 co-doped tetragonal zirconia polycrystals (TZP) containing 10 to 30 vol.% Al 2O 3 ((Y,Nb)-TZP/Al 2O 3) were sintered for 5 h at 1550°C in air and hydrothermal stability of the composites was evaluated after aging for 5 h at 180°C in 0.3 MPa H 2O vapor pressure. (Y,Nb)-TZP/Al 2O 3 composites showed superior phase stability under the hydrothermal condition as compared with 3Y-TZP/Al 2O 3 composites due to the effects of Y–Nb ordering in t-ZrO 2 and the Al 2O 3 addition. The optimized strength and fracture toughness were 670 MPa and 7.3 MPa m 1/2, respectively, when 20 vol.% of 2.8 μm Al 2O 3 particles were added.
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