Y-Ce-TZP/Al_2O_3复相陶瓷空气环境下退火的相变行为  

Phase Transformation of Y-Ce-TZP/Al_2O_3 Composite Ceramic Annealed in Air

作　　者：林旭平[1] 马景陶[1] 张宝清[1] 邓雪萌[1] 

机构地区：[1]清华大学核能与新能源技术研究院,北京102201

出　　处：《稀有金属材料与工程》2007年第A01期252-255,共4页Rare Metal Materials and Engineering

基　　金：国家"863"项目(2002AA332080);北京市教育委员会共建资助项目

摘　　要：研究了不同烧结温度和不同Al2O3含量的Y-Ce-TZP/Al2O3复相陶瓷在300℃空气环境下退火的相变行为,并考察了复相陶瓷的力学性能,对相变发生进行了热力学分析。结果表明:Al2O3抑制了退火过程氧化锆t→m相变,当Al2O3含量为15%(质量分数,下同),烧结温度为1450℃时Y-Ce-TZP/Al2O3复相陶瓷退火前的抗弯强度与断裂韧性分别为743MPa和10.0MPa·m1/2,退火10d后仍达到731MPa和9.9MPa·m1/2。Y2O3 and CeO2 co-doped tetragonal zirconia polycrystals containing 0 to 20 wt% Al2O3 were sintered for 2 h at 1400 ℃ to 1600 ℃. Phase stability and mechanical properties of the composites were evaluated after annealed at 300 ℃ in air. The results show that, a small addition of Al2O3 particles inhibited the tetragonal to monoclinic transformation in air. The flexural strength and fracture toughness of the composite when added 15wt% Al2O3 and sintered at 1450 ℃ reached 731 MPa and 9.9 MPa.m^1/2, respectively, after annealing for 240 h.

关 键 词：四方相氧化锆多晶 退火 相变 氧化铝 

分 类 号：TQ174.1[化学工程—陶瓷工业]