Effect of Al2O3 Addition on Microstructure,Thermal Expansion and Mechanical Properties of Ta2O5 Ceramics

摘要：

　　The Ta2O5-based ceramics were prepared by dry pressing/sintering technique using Ta2O5 and Al2O3 as the starting materials.The present work investigated the effect of alumina (Al2O3) additions on the composition,microstructure,thermal expansion coefficient (TEC) and bending strength of Ta2O5 ceramics.The thermal expansion of the samples was measured by the dilatometry method.It was found that Al2O3 additions can effectively inhibit the β to α phase transformation in Ta2O5 ceramics.Orthorhombic AlTaO4 as the minor phase formed when 2.5 and 7.0 wt% Al2O3 was added.The addition of Al2O3 results in obvious change of TEC and an increase of bending strength.This work demonstrated that the addition of Al2O3 is an effective way to modify the TEC and mechanical strength of Ta2O5 ceramics.

关键词： Tantalum pentoxide Alumina Phase transformation Thermal expansion coefficient Bending strength

作者: Jian-er Zhou Jing Zhang Xiaozhen Zhang Xuebing Hu

作者单位: School of Materials Science and Engineering,Jiangxi Key Laboratory of Advanced Cerami Materials,Jingdezhen Ceramic Institute,Jingdezhen 333001,P.R.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: 631-634

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）