| 引用本文: | 高庆福,张长瑞,冯坚,等.氧化铝气凝胶复合材料的制备与隔热性能.[J].国防科技大学学报,2008,30(4):39-42.[点击复制] |
| GAO Qingfu,ZHANG Changrui,FENG Jian,et al.Preparation and Thermal Performance of Alumina Aerogel Insulation Composites[J].Journal of National University of Defense Technology,2008,30(4):39-42[点击复制] |
|
| |
|
|
| 本文已被：浏览 9230次 下载 6053次 |
| 氧化铝气凝胶复合材料的制备与隔热性能 |
| 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1000℃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1000℃时导热系数为0.0685 W/m·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 |
| DOI： |
| 投稿日期：2008-03-01 |
| 基金项目:国防科技重点实验室基金资助项目 |
|
| Preparation and Thermal Performance of Alumina Aerogel Insulation Composites |
| GAO Qingfu, ZHANG Changrui, FENG Jian, WU Wei, FENG Junzong |
|
(College of Aerospace and Materials Engineering, National Univ. of Defense Technology, Changsha 410073，China)
|
| Abstract: |
| Alumina aerogel thermal insulation composites were prepared by sol-gel 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. The mechanism of thermal insulation of alumina aerogel composites was analyzed. The results show that, compared with silica aerogel, alumina aerogel can withstand even 1000℃ calcinations but still keeps the porous network. When alumina aerogel is introduced into the ceramic fiber, due to the excellent thermal resistance property of alumina aerogel, the thermal insulation property of composites is evidently improved, and the thermal conductivity of composites is 0.685 W/m·K at 1000℃. |
| Keywords: sol-gel alumina aerogel composite thermal insulation thermal conductivity |
|
|
|
|
|
