文档介绍：国防科技大学学报
第 30 卷第 4 期 JOURNAL OF NATIONAL UNIVERSITY OF DEFENSE TECHNOLOGY Vol. 30 No. 4 2008
文章编号: 1001- 2486( 2008) 04- 0039- 04
氧化铝气凝胶复合材料的制备与隔热性能X
高庆福, 张长瑞, 冯坚, 武纬, 冯军宗
( 国防科技大学航天与材料工程学院, 湖南长沙 410073)
摘要: 以仲丁醇铝为先驱体, 采用溶胶- 凝胶工艺制备氧化铝溶胶, 并将其与无机陶瓷纤维毡复合经超
临界流体干燥得到氧化铝气凝胶隔热复合材料。利用扫描电子显微镜( SEM) 和氮气吸附等方法对样品微观
结构进行分析, 利用热平板法对材料的隔热性能进行测试, 并分析了氧化铝气凝胶隔热复合材料隔热机理。
研究表明: 与氧化硅气凝胶相比, 氧化铝气凝胶具有更好的耐高温性能, 经 1000e 热处理后仍然能够较好地
保持其纳米多孔结构; 将气凝胶与纤维复合后, 充分发挥了氧化铝气凝胶优良的隔热特性, 使得复合材料的隔
热性能较纯纤维毡有了明显的改善, 其热面温度 1000e 时导热系数为 010685 WPm#K 。
关键词: 溶胶- 凝胶; 氧化铝气凝胶; 复合材料; 隔热性能; 导热系数
中图分类号:TQ263 文献标识码: A
Preparation and Thermal Performance of Alumina Aerogel
posites
GAO Qing-fu, ZHANG Chang-rui, FENG Jian, WU Wei, FENG Jun-zong
(College of Aerospace and Material Engineering, National Univ. of Defense Technology, Changsha 410073, China)
Abstract: Alumina aerogel thermal posites were prepared by so-lgel and supercritical drying process, using aluminum
sec-butoxide as precursor, and ceramic fiber as reinforcement. The microstructures were characterized by nitrogen adsorption experiments
and scanning electron microscope ( SEM) , and the thermal insulation property was tested by hot plate method. T he mechanism of thermal
insulation of alumina posites was analyzed. The results show that, compared with silica aerogel, alumina aerogel can
withstand even 1000e calcinations but still keep