宇航材料工艺2017，Vol.47Issue(3)：33-36,41,5.DOI:10.12044/j.issn.1007-2330.2017.03.008
氧化铝气凝胶复合高温隔热瓦的制备及性能
Fabrication and Properties of Aerogels Impregrated High-Temperature Insulating Tiles
摘要
Abstract
Using ceramic fibrous insulating tiles as skeleton,the alumina sols via sol-gel process were infiltrated into the tiles via vacuum infiltration,followed by gelation,aging and supercirtical drying to fabricate the aerogels impregnated high-temperature insulating tiles.The aerogel/tile composites' microstructure,thermal and mechanical properties at high-temperatures (up to 1400℃) were investigated.The results showed the composites exhibited a small linear shrinkage of 2％ after hating at 1400℃ for 30 min.With increasing heating temperature,the aerogels' particles grew and condensed;the aerogels changed from filling the fibers' pores to being condensed,and to being mainly attached to the fibers' surface,but such evolution did not obviously affect the fibrous skeleton.After the aerogel impregnation,the specimen's room-temperature and high-temperature thermal conductivities decreased significantly,and the cold-face temperature dropped from 945℃ to 870℃ in the back-temperature tests.In addition,although the composites' room-temperature mechanical properties increased slightly,the high-temperature compressive strength drastically degraded at 1200℃ and 1400℃.关键词
气凝胶/隔热瓦/隔热性能/力学性能Key words
Aerogel/Insulating tiles/Thermal properties/Mechanical properties分类
通用工业技术引用本文复制引用
孙晶晶,胡子君,吴文军,周洁洁,李俊宁..氧化铝气凝胶复合高温隔热瓦的制备及性能[J].宇航材料工艺,2017,47(3):33-36,41,5.基金项目
国家自然科学基金面上项目(No.51576058) （No.51576058）
