| 摘要 |
Fracture toughness and strength of an Al2O3/ZrO2 ceramic is increased by incorporating metastable grains of tetragonal ZrO2 in the structure. During cracking, the metastable tetragonal ZrO2 transforms to a stable monoclinic structure thus increasing the energy required for the crack to propagate and retarding its growth. The ZrO2 occupies from 5 to 95% of the volume of the ceramic and has dissolved in it a rare earth oxide such as Y2O3, CeO2, La2O3 and/or Er2O3 to promote retention of the metastable tetragonal ZrO2.
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