YCe-TZP陶瓷的低温时效

来源期刊：中南大学学报(自然科学版)2000年第4期

论文作者：尹邦跃 王零森 林健凉 张金生 樊毅

文章页码：335 - 338

关键词：3Y-TZP; YCe-TZP;低温时效;老化;相变

Key words：3Y-TZP; YCe-TZP; low-temperature aging; degradation; phase transformation

摘    要：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.

Abstract: 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 2 h. The emphasis was on the studies of variations of bending strength and microstructure before and after aging in 250℃water vapour for 150 h. The results showed that when CeO₂ content increased, bending strength of TZPs was found to decrease slowly, and 3Y4Ce-TZP showed no degradation. Combinedwith IR and EDAX techniques, aging degradation mechanism for 3YTZPwas investigated. It was proved that CeO₂ protecting layer formed during aging was useful to preventY-OHbond formation, so t→m aging phase transformation was also effectively prevented.