Influences of SiO2 on Densification and Properties of Large Bulk Al2O3/ZrO2 (4Y) Eutectics

摘要：

　　Based on preparing large bulk Al2O3/ZrO2 (4Y) eutectics,SiO2 additive is used for controlling the microstructures,densification and mechanical properties.XRD pattern showed SiO2 additive in the ceramics was in the form of glass phase.SEM images showed that the microstructure morphologies transformed from the cellular eutectics to the rod-shaped colonies with increasing content of SiO2 additive.With increasing content of SiO2 additive,the relative density of the ceramics increased whereas the hardness of the ceramics decreased.As the content of SiO2 additive reached 4%,fracture toughness of the ceramics had the maximum value due to the coupled toughening mechanisms of crack-pinning,crackbridging and crack-deflection by rod-shaped colonies.As content of SiO2 additive reached 6%,the highest flexural strength of the ceramics was achieved due to high fracture toughness and small-size critical defect.

关键词： Al2O3/ZrO2 (Y2O3) eutectics Combustion synthesis High gravity

作者: Quan Yang Zhongmin Zhao Long Zhang Chuanzeng Pan Zhensheng Qu Minquan Wang

作者单位: Institute of Advanced Materials, Mechanical Engineering College, Shijiazhuang 050003, China Center for Education Technology, Mechanical Engineering College, Shijiazhuang 050003, China

会议类型: 国际会议

会议名称: The Sixth China International Conference on High-Performance Ceramics(第六届中国先进陶瓷国际研讨会(CICC-6))

会议地点: 哈尔滨

会议语种:英文

页码: 5-8

在线出版日期: 2009-08-16（万方平台首次上网日期，不代表论文的发表时间）