Fabrication of High Strength α-SiAlON/BN Composition Ceramics by Hot Pressing

摘要：

　　Dense Y3+-dopted α-SiAlON/BN composition ceramics were fabricated by hot pressing sintering at 1900 ℃ holding for 1 h,then flexural strength was investigated through three-point bending test at room and 1000 ℃.The results show that h-BN contributes to the densification of the powder,but which has little affect on the key temperature region of sintering densification of α-SiAlON ceramics.When content of BN is lower,which dont affect on the phase transformation of α-SiAlON,but when content of BN is higher,besides of major phase α-SiAlON,a little of β-SiAlON were also formed.For the α-SiAlON/BN composite ceramics content of 20 wt.% h-BN,the higher flexural strength (room-temperature and 1000 ℃) is obtained,the formation of β-SiAlON should be an important reason for the higher strength,more important is,whose flexural strength at 1000 ℃ was higher 50 MPa than at room temperature,the difference of thermal properties between SiAlON and BN should contribute to the improve of high-temperature flexural strength.

关键词： SiAlON/BN Hot pressing Flexural strength

作者: Yingchun Shan Guang Wang Hui Ye Xiaoguang Han Jiujun Xu Jiangtao Li

作者单位: Department of Materials Science and Engineering,Dalian Maritime University,Dalian 116026,China Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing 100080,China

会议类型: 国际会议

会议名称: The Seventh China International Conference on High-Performance Ceramics (第七届先进陶瓷国际研讨会(CICC-7))

会议地点: 厦门

会议语种:英文

页码: 816-819

在线出版日期: 2011-11-04（万方平台首次上网日期，不代表论文的发表时间）