Al_2O_3对3Y-TZP热稳定性及机械性能的影响  

The Effect of Al_2O_3 on the Thermal Stability and Mechanical Properties of 3Y-TZP

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》2008年第A01期322-325,共4页Rare Metal Materials and Engineering

基　　金：北京市教育委员会共建项目资助

摘　　要：研究了添加0～20%Al_2O_3(质量分数,下同)的3Y-TZP/Al_2O_3复相陶瓷在300℃空气环境下退火处理的相变行为,并考察了复相陶瓷的抗弯强度、断裂韧性等力学性能退火处理前后的变化,对相变机理进行了分析。结果表明:Al_2O_3可以有效抑制退火处理过程中氧化锆t→m相变,当Al_2O_3含量为6%即有明显的抑制效果,而且具有较优的综合性能。The phase transformation of tetragonal-to-monoclinic was studied in yttria （3mol%） stabilized zirconia which contained of 0-20wt% Al2O3 upon annealing in air at 300℃. The changes of the flexural strength and fracture toughness before and after annealing were studied and the mechanism of the phase transformation was discussed. Results showed that alumina can effectively prevent the phase transformation of tetragonal-to-monoclinic in the yttria stabilized ZrO2 during annealing process. The thermal stability of the ceramics was remarkably improved by adding 6wt% Al2O3, and, at the same time, the flexural strength reached 746.8MPa which remained at 729.0MPa after annealing for 240 h at 300℃.

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]