ZTM_(15)(2Y)/Al_2O_3材料低温时效的研究  

Study on the Low-temperature Ageing of ZTM_(15 ) (2Y)/Al_2O_3 Composites

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：《材料工程》2001年第4期16-18,共3页Journal of Materials Engineering

基　　金：教育部重点实验室基金!项目 (NO.9915 0 ) ;美国 3M公司资助

摘　　要：在 ZTM1 5 (2 Y)中加入 Al2 O3粒子 ,可以改善材料的微观结构 ,使 ZTM1 5 (2 Y)材料的室温力学性能提高。尤其是材料的断裂韧性 ,由 4.0 MPa· m1 / 2增至 7.8MPa· m1 / 2 ,其主要贡献源于微裂纹增韧。但由于 Al2 O3粒子的引入 ,增加了 ZTM1 5 (2 Y)基体中微裂纹的密度 ,所以不能有效抑制 ZTM1 5 (2 Y)材料低温时效处理力学性能下降现象 ,相反 ,将加速材料力学性能的退化。A microstructure with a narrow ZrO 2 grain size distribution in the fine mullite grain matrix was obtained by the addition of 5vol%～10vol%Al 2O 3 particles The effect of Al 2O 3 particles on the low tempe rature ageing of ZTM 15 (2Y)/Al 2O 3 composites was studied. The result shows that compared with ZTM 15 (2Y), the room temperature mechanical properties of ZTM 15 (2Y)/Al 2O 3 composites, especially the toughness, are remarkably improved, and toughness could reach 7 8MPa·m 1/2 The microcraking is the dominant toughening mechanism The addition of Al 2O 3 particles could not inhibit the degradation behavior of ZTM 15 (2Y) because of the increase of microcraks, on the contrary, enhanced t m transformation during ageing

关 键 词：时效热处理 力学性能 莫来石 氧化铝 ZTM15(2Y)材料 低温时效 

分 类 号：TQ174.758[化学工程—陶瓷工业]