作　　者： ; ; ; ;

机构地区： 济南大学材料科学与工程学院

出　　处： 《人工晶体学报》 2009年第S1期238-241,共4页

摘　　要： 选用莫来石纤维(MF)和纳米ZrO2为增强体制备了MZTA复合增韧氧化铝陶瓷复合材料。通过设计正交试验讨论了MF含量、nano-ZrO2含量、烧结温度、保温时间等因素对材料力学性能的影响,利用扫描电镜、能谱分析仪研究了陶瓷复合材料的微观结构与性能的关系。结果表明:当莫来石纤维和纳米ZrO2的质量分数分别为10%,烧结温度为1550℃,保温时间为30 min,陶瓷复合材料的抗弯强度、断裂韧性分别达到712 MPa、10.05 MPa.m1/2,与纯Al2O3陶瓷相比晶粒细化、力学性能显著提高;纤维的拔出、桥联、裂纹扩展路径偏转、沿晶断裂等消耗了大量的断裂能、缓和了裂纹尖端的应力是材料断裂韧性提高的主要原因。 Alumina ceramic was toughened by adding mullite fiber and nano-ZrO2.The influences of content of mullite fiber and nano-ZrO2,sintering temperature and holding time on alumina were discussed using orthogonal experiment design and the relations between microstructure and properties were studied by SEM,EDAX.The results showed that the bending strength,fracture toughness of ceramic composite with 10% MF and Nano-ZrO2 sintered at 1550 ℃ for 30 min were 712 MPa and 10.05 MPa·m1/2 respectively.The ceramic composite had higher mechanical properties compared with pure alumina ceramic.The MF pulling out and bridging,crack deflection,and intergranular fracture were main reasons for increasing toughness of the alumina ceramic composite.

关 键 词： 莫来石纤维 纳米 增韧 氧化铝陶瓷 力学性能

领　　域： [一般工业技术]