热震对ZrO_2陶瓷弯曲强度和显微结构的影响  

Thermal Shock Resistance and Micro-structural Changes of ZrO_2 Ceramics

作　　者：马中辉[1] 孙洪巍[1] 石策[1] 朱冬冬[1] 

机构地区：[1]郑州大学物理工程学院材料物理教育部重点实验室,郑州450052

出　　处：《材料导报（纳米与新材料专辑）》2010年第1期487-489,508,共4页

摘　　要：研究了6YSZ、(6Y-Mg)-ZrO_2和6YSZ-MgAl_2O_4复相材料热震处理对力学性能和微观结构的影响。通过XRD和SEM对材料物相和结构的表征,阐明了6YSZ陶瓷在热处理后断裂特性突变的机理。实验结果表明,ZrO_2陶瓷在1200～1400℃高温热震处理后,由于热韧化和马氏体相变会出现重烧结,使材料弯曲强度增大;ZrO_2与少量不共溶MgAl_2O_4形成的复相材料在高温热震处理后会出现明显的热失配现象,使材料的力学性能下降。The influence of thermal shock on the mechanical properties and micro-structural of 6YSZ, （6Y- Mg）-ZrO2 ceramics and 6YSZ-MgAl2O4 composites is investigated. By characterization of the phase and structure through XRD and SEM, the mechanism that mutability of 6YSZ ceramic fracture characteristics after thermal shock treatment is clarified. The experimental results show that ZrO~ ceramics are double sintered by the influence of marten- sitic phase transformation and thermal toughening, which is treated by thermal shock at 1200- 140℃. The mechanical properties degradation of composite material which is 6YSZ-MgAl2O4 treated by thermal shock degradation by the influence of thermal mismatching.

关 键 词：6YSZ 热震 力学性能 热韧化 

分 类 号：TQ174.758[化学工程—陶瓷工业]