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隔热瓦/SiO2气凝胶复合材料的制备与性能
吴文军1,肖鹏1,曾凡2,高志勇2,李俊宁1
1.航天材料及工艺研究所,先进功能复合材料技术重点实验室,北京 100076;2.空装驻北京地区第三军事代表室,北京 100076
摘要:
以莫来石纤维和玄武岩纤维为主要成分,以硅溶胶为黏接剂制备的隔热瓦作为增强体,真空浸渍SiO2溶胶后经过凝胶、老化和超临界干燥工艺制备隔热瓦/SiO2气凝胶复合材料,并对材料的微观结构、热稳定性和隔热性能进行了表征。结果表明:由于玄武岩纤维具有更细的直径和含有一定量的红外辐射抑制成分,随着隔热瓦中玄武岩纤维质量分数的增加,复合材料的室温热导率从63 mW/(m·K)降至47 mW/(m·K),在热面600 ℃持续15 min条件下的背面温度从200 ℃降至117 ℃,有效地提高了复合材料的隔热性能;但因玄武岩纤维的使用温度显著低于莫来石纤维,复合材料的高温线收缩率增大,热稳定性有所下降。
关键词:  隔热瓦  SiO2气凝胶  热稳定性  隔热性能
DOI:10.12044/j.issn.1007-2330.2019.05.007
分类号:TB3
基金项目:
Fabrication and Properties of Insulating Tiles/SiO2 Aerogels Composite
WU Wenjun1,XIAO Peng1,ZENG Fan2,GAO Zhiyong2,LI Junning1
1.Science and Technology on Advanced Functional Composites Laboratory,Aerospace Research Institute of Materials & Processing Technology,Beijing 100076;2.The third Military Representative Office of Air Force Equipment Department in Beijing,Beijing 100076
Abstract:
The insulating tile reinforcement was fabricated using mullite fiber,basalt fiber as main components and silica sol as binder.And insulating tiles/SiO2 aerogels composite was prepared by infiltrating the silica sols into the insulating tiles via vacuum infiltration,followed by gelation,aging and supercirtical drying.The microstructure, thermal stability,and insulating properties of the composite were characterized and measured.The results show that with the increasing of the content of basalt fiber of the insulating tiles,the room-temperature thermal conductivitie decreased from 63 mW/(m•K) to 47 mW/(m•K),and the cold-face temperature dropped from 200 ℃ to 117 ℃ in the back-temperature tests heated at 600 ℃ for 15 min,due to the thinner diameter and infrared radiation containing materials of basalt fiber.However the linear shrinkage increased thus the thermal stability of the composition weakened,due to the remarkably low thermal stability of basalt fiber.
Key words:  Insulating tiles  SiO2 aerogels  Thermal stability  Insulating properties