Abstract
Yttria-ceria-doped tetragonal zirconia (Y,Ce)-TZP)/alumina (Al2O3) composites were fabricated by hot isostatic pressing at 1400° to 1450°C and 196 MPa in an Ar–O2 atmosphere using the fine powders prepared by hydrolysis of ZrOCl2 solution. The composites consisting of 25 wt% Al2O3 and tetragonal zirconia with compositions 4 mol% YO1.5–4 mol% CeO2–ZrO2 and 2.5 mol% YO1.5–5.5 mol% CeO2–ZrO2 exhibited mean fracture strength as high as 2000 MPa and were resistant to phase transformation under saturated water vapor pressure at 180°C (1 MPa). Postsintering hot isostatic pressing of (4Y, 4Ce)-TZP/Al2O3 and (2.5Y, 5.5Ce)-TZP/Al2O3 composites was useful to enhance the phase stability under hydrothermal conditions and strength.
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