Nanometer powders of 3Y-TZP, 3Y2Ce-TZP(3％ Y2O3-2％ CeO2-ZrO2), and 3Y4Ce-TZP(3％ Y2O3-4％CeO2-ZrO2) which were prepared by coprecipitation method were pressureless sintered at 1 450℃ for 2h. The emphasiswas on the studies of variations of bending strength and microstructure before and after aging in 250℃ water vapour for150 h. The results showed that when CeO2 content increased, bending strength of TZPs was found to decrease slowly,and 3Y4Ce-TZP showed no degradation. Combined with IR and EDAX techniques, aging degradation mechanism for 3Y-TZP was investigated. It was proved that CeO2 protecting layer formed during aging was useful to prevent Y-OH bond for-mation, so t→m aging phase transformation was also effectively prevented.%对化学共沉淀法制备的3Y-TZP,3Y2Ce-TZP(3％Y2O3-2％CeO2-ZrO2)和3Y4Ce-TZP(3％Y2O3-4％CeO2-ZrO2)纳米粉末进行了1 450℃无压烧结，研究了这3种TZP陶瓷在250℃水蒸汽中时效150 h前后抗弯强度和显微结构的变化．此外，结合红外光谱和EDAX能谱分析，探讨了3Y-TZP的时效老化机理．结果表明：随着CeO2含量增加，TZP时效后抗弯强度的降低幅度减小，3Y4Ce-TZP几乎不发生时效老化现象；在时效过程中，3Y4Ce-TZP表面形成了CeO2保护层，防止了Y-OH键的形成，从而有效地抑制了t→m时效相变．
展开▼
