Paper number 1004

PREPARATION OF ALUMINA MATRIX FOR CERAMIC COMPOSITES BY SOL-GEL METHOD

Jiayu Xiao, Zhengfang Xie, Zhaohui Chen, Xingye Wang, Wenwei Zheng, and Junzhi Liu

Department of material Engineering and Applied Chemistry,
National University of Defense Technology, Changsha, Hunan, 410073, P. R. China
Tel: 86731 4505459, Fax: 86731 4518859
E-mail: jyxiao@nudt.edu.cn

Summary

a-Alumina (a-Al2O3) is a typical delegate of oxide ceramics, which owns many excellent properties, such as high melt point, excellent high temperature stability, good heat and electrical properties, etc.. It is widely applied in industry fields at many aspects. It may also be a kind of good high temperature structure material for its high strength and modulus at high temperature. The sol-gel method is chosen to prepare Al2O3 matrix in order to fabricate a-Alumina matrix composite reinforced by three dimensional carbon fiber braided preform. Some Al2O3 sols are prepared by hydrolysis aluminum salt or aluminum alkoxide, then, the sols prepared can infiltrate into the preform. Thus gelation and pyrolysis in the preform can be carried out. After pyrolysis, Al2O3 matrix composite reinforced by carbon fiber woven preforms could be obtained.

Keywords

alumina (Al2O3) matrix, sol-gel method, aluminium isoproxide, aluminium nitrite, aluminium chloride.