化工进展Issue(8)：2134-2139,2169,7.DOI:10.3969/j.issn.1000-6613.2014.08.032
影响二氧化硅气凝胶隔热涂料热导率的因素
Effect of contents and sizes on the thermal conductivity of silica aerogel thermal insulation coatings
摘要
Abstract
The silica aerogel microspheres were prepared by sol-gel method and atomization technology,and the silica aerogel thermal insulation coatings were also prepared. The microstructures were observed by scanning electron microscopy(SEM). The sizes of microspheres were tested by a laser particle detector. The thermal conductivity of the coating was measured by Hot Disk thermal content meter. The results show that significant aggregations of silica aerogel microspheres with a high volume fraction are generated in the coatings,the number of pores in the coating increases according to SEM diagrams. Additionally,the aggregations are easy to be formed by small size silica aerogel microspheres. The thermal conductivity of the coating decreases with the increase of volume fraction because of the high thermal resistance of the silica aerogel microspheres. Aggregations of the silica aerogel microspheres have a negative impact on the reduction of thermal conductivity compared with that evenly distributed,but the pores help reduce thermal conductivity because of the high thermal resistance of air. Meanwhile,the interfacial thermal resistance of silica aerogel microspheres of small sizes is bigger than that of big sizes. So the thermal conductivity of coatings with small size microspheres is lower than that of coating with big size microspheres. Hybrid sizes increase the stacking density of silica aerogel microspheres in coating which help reduce thermal conductivity.关键词
二氧化硅/气凝胶/热导率/粒径Key words
silica/aerogel/thermal conductivity/particle size分类
化学化工引用本文复制引用
何方,吴菊英,黃渝鸿,程娟,郑伟..影响二氧化硅气凝胶隔热涂料热导率的因素[J].化工进展,2014,(8):2134-2139,2169,7.基金项目
国家自然科学基金委员会和中国工程物理研究院联合基金（NSAF）（11076010）项目。 （）
