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绝缘保温气凝胶的建筑应用:技术发展水平综述
摘要:
气凝胶被认为是当今建筑用材中最有发展前景的高性能绝热保温材料之一。相较于传统绝热材料,商用气凝胶表现出了惊人的性能特点:热导系数低至13mW/(mk),太阳光谱中的高透射率以及建造行业的巨大潜力。这些给予了建筑师和工程师重新设计建筑方案的思路。在这篇文章中,我们将综述绝热气凝胶的相关知识并详细介绍建筑方面的应用。
目录
1 简介 ............................................................................................................................. 1
2 合成方法 ...................................................................................................................... 2
2.1制备凝胶 ............................................................................................................. 2
2.2 老化 ................................................................................................................... 3
2.3 干燥 ................................................................................................................... 3
2.3.1 超临界干燥法 ............................................................................................ 3
2.3.2 常压干燥法 ............................................................................................... 4
3 硅气凝胶的固体性质..................................................................................................... 4
3.1 热导率 ................................................................................................................ 5
3.2 光学性能 ............................................................................................................ 6
3.3声学性能 ............................................................................................................. 7
3.4 安全性及防火性能 .............................................................................................. 7
4 气凝胶的建筑用途 ........................................................................................................ 7
4.1 不透明绝缘气凝。 .............................................................................................. 8
4.2半透明绝缘气凝胶 ............................................................................................... 8
5 其它高性能绝热材料和方案 .......................................................................................... 9
6 结论 ........................................................................................................................... 10
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