摘要
以超轻质开孔柔性聚酰亚胺泡沫为基体,采用溶胶凝胶工艺制备了一系列二氧化硅气凝胶原位填充的聚酰亚胺复合泡沫。复合泡沫密度10~100 kg/m^(3)可调,厚度1~400 mm可调,最大宏观尺寸可达1m×1m。对其泡孔结构、隔热性能、热性能进行了系统表征,分析了二氧化硅气凝胶原位填充聚酰亚胺泡沫的隔热机理。结果表明:二氧化硅气凝胶的引入,可有效降低复合泡沫室温热导率,提高其隔热性能;随着二氧化硅气凝胶含量的增加,聚酰亚胺复合泡沫的热导率由38.8 mW/(m·K)降低至19.6 mW/(m·K);热端温度300℃时,复合泡沫热导率仅为61.1 mW/(m·K);填充二氧化硅气凝胶后,聚酰亚胺复合泡沫热稳定性大大提高,在900℃下热失重残留量约为80%。
A series of silica aerogel in-situ filled composite foams were prepared by sol-gel process using ultra-light open-cell flexible polyimide foam as matrix.The density of composite foam was adjustable from 10 kg/m to 100 kg/m^(3),the thickness was adjustable from 1 mm to 400 mm,and the maximum macro size could reach 1m×1m.The cell structure,thermal insulation performance and thermal performance were systematically characterized,and the thermal insulation mechanism of polyimide foam in-situ flled with silica aerogel was analyzed.The results show that the introduction of silica aerogel can effectively reduce the thermal conductivity of composite foams at room temperature and improve its thermal insulation performance.With the increase of silica aerogel content,the thermal conductivity of the composite foam decreases from 38.8 mW/(m·K)to 19.6 mW/(m·K).When the hot end temperature is 300℃,the thermal conductivity of the composite foam is only 61.1 mW/(m·K).After flling the silica aerogel,the thermal stability of the composite foam is significantly improved,and the thermal weight loss residue is about 80%at 900℃.
作者
胡子扬
马晶晶
赵一搏
滕冲
赵建设
HU Ziyang;MA Jingjing;ZHAO Yibo;TENG Chong;ZHAO Jianshe(Aerospace Research Institute of Materials&Processing Technology,Beijing 100076)
出处
《宇航材料工艺》
CAS
CSCD
北大核心
2024年第2期82-88,共7页
Aerospace Materials & Technology
