Ceria-stabilized zirconia ceramics are characterised by excellent hydrothermal stability and high fracture toughness, but the fracture strength and hardness are lower than that of conventional 3Y-TZP, which is sensitive to low temperature degradation in humid environments. In the present work, the influence of small concentrations of calcia on the microstructure, mechanical properties and hydrothermal ageing resistance of 10 and 12 mol% CeO₂ stabilised ZrO₂ has been assessed. The addition of only 1 mol% of CaO had a strong refining effect on the microstructure resulting in an increased hardness and strength but reduced stress activated tetragonal-to-monoclinic transformability. The addition of 3 mol% CaO however enhanced the transformability with respect to 1 mol% CaO and preserved the high resistance to hydrothermal degradation of Ce-TZP.

二氧化铈稳定的氧化锆陶瓷具有出色的水热稳定性和较高的断裂韧性，但断裂强度和硬度低于常规的3Y-TZP，它对潮湿环境下的低温降解敏感。在目前的工作中，少量氧化钙对10和12 mol％CeO ₂稳定的ZrO ₂的微观结构，力学性能和耐水热老化性的影响已评估。仅添加1mol％的CaO对微结构具有很强的细化作用，导致硬度和强度增加，但是应力激活的四方晶向单斜晶的转化性降低。然而，添加3mol％的CaO相对于1mol％的CaO提高了可转化性，并且保留了对Ce-TZP的水热降解的高抗性。