ZTM材料低温时效处理的研究  

STUDY ON THE BEHAVIOR OF ZTM COMPOSITES AGED AT LOW-TEMPERATURE

作　　者：蔡舒[1] 袁启明[1] 孟佳宏[1] 陈玉如[1] 杨正方[1] 

机构地区：[1]天津大学材料学院无机非金属材料系,天津300072

出　　处：《硅酸盐学报》2001年第3期221-225,共5页Journal of The Chinese Ceramic Society

摘　　要：通过对ZrO2 增韧莫来石陶瓷 (ZTM)低温时效现象的研究 ,发现材料表面及内部存在的微裂纹是导致材料在 2 0 0～ 3 0 0℃时效处理后力学性能下降的重要原因 .在 5 0 0～ 60 0℃时效处理 ,材料力学性能提高主要源于可相变t-ZrO2 相对含量增加和由逆马氏体相变 (counter_martensitictransformation)引起的体积收缩使部分应力得以释放 .降低烧结体中t-ZrO2 晶粒尺寸或提高稳定剂Y2The degradation behavior of zirconia-toughened mullite composites aged at low temperature in air was investigated. The results indicate that the existence of microcracks which are formed by the transformation (t&rarrm) occurred at the cooling processing is an important factor for the degradation of mechanical properties during the ageing. The increase of the flexural strength of ZTM composites aged at 500-600°C is attributed to the increase of transformable t-ZrO2 content and the release of stress due to the volume shrinkage caused by the counter-martensitic transformation. Reducing the tetragonal ZrO2 grain sizes or increasing the stabilizer (Y2O3) content can inhibit the degradation behavior of ZTM composites aged at low temperature in air.

关 键 词：氧化锆增韧 莫来石陶瓷 时效热处理 微裂纹 四方氧化锆 

分 类 号：TQ174.758.11[化学工程—陶瓷工业]