Hydrothermal stability of yttria- and ceria-doped tetragonal zirconia-alumina composites
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Changes in the crystalline phase and microstructure resulting from hydrothermal ageing of Y-TZP, (Y,Ce)-TZP, Y-TZP-Al2O3 composites and (Y,Ce)-TZP-Al2O3 composites were investigated under hydrothermal conditions at 180 °C and 1 MPa. Although (Y,Ce)-TZP showed no tetragonal-to-monoclinic (t→m) phase transformation during low-temperature ageing in air as compared with 3Y-TZP, the tetragonal phase of (Y,Ce)-TZP easily transformed to monoclinic phase by ageing under hydrothermal condition. This t→m phase transformation invaded the inside of the body accompanied by microcracks. (Y,Ce)-TZP-Al2O3 composites were resistant to phase transformation during hydrothermal ageing.
KeywordsPolymer Microstructure Phase Transformation Yttria Crystalline Phase
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