Abstract The influence of La2O3 on the microstructure and mechanical properties of 12Ce-TZP was investigated. The 12Ce-TZP-xLa2O3 ceramics were synthesized by a conventional solid state reaction method. La2O3 addition had significant influences on the phase composition and microstructure, as well as on the mechanical properties of all compacts. At lower La2O3 concentration (below 0.2 mol%), the microstructure refinement of the compact was obtained due to La2O3 segregation at the grain boundary, leading to a large improvement of both the hardness and strength. At higher concentration, the evolution of hardness and strength of all compacts were associated with zirconia stabilization effect and La2Zr2O7 precipitation at the grain boundary, as well as the appearance of monoclinic phase. Additionally, the transformation toughening mechanism played a dominant role in this system. Finally, an optimum combination of hardness and strength was obtained for the 0.5 mol% La2O3 containing compact.

中文翻译：

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La 2 O 3 对12Ce-TZP组织和力学性能的影响

摘要 研究了La2O3对12Ce-TZP显微组织和力学性能的影响。12Ce-TZP-xLa2O3 陶瓷是通过常规固相反应法合成的。La2O3 添加对相组成和微观结构以及所有压块的机械性能有显着影响。在较低的 La2O3 浓度（低于 0.2 mol%）下，由于 La2O3 在晶界处的偏析，压坯的微观结构得到了细化，从而导致硬度和强度都有很大的提高。在较高浓度下，所有压块的硬度和强度的演变与氧化锆稳定作用和晶界处的 La2Zr2O7 析出以及单斜相的出现有关。此外，转变增韧机制在该体系中起主导作用。最后，获得了含 0.5 mol% La2O3 压块的硬度和强度的最佳组合。