CAJ | 학술논문

针对中高温领域热防护需求，以正硅酸乙酯作为硅源，通过溶胶-凝胶（sol-gel）工艺结合超临界干燥技术制备了可加工高效气凝胶复合隔热材料。对气凝胶复合隔热材料的微观结构、热物理性能及力学性能进行了表征和分析。结果表明：气凝胶纳米粒子均匀分布在复合材料中，组成三维网络结构，孔径在70nm以下，比表面积在800-1000m2/g。热学性能显示，气凝胶复合材料在300℃的导热系数为0．03W/mK ，800℃/20min ，线收缩＜1％；力学性能显示，压缩强度为0．2M Pa。此外，复合材料具有优异的加工性能。
침대중고온영역열방호수구，이정규산을지작위규원，통과용효-응효（sol-gel）공예결합초림계간조기술제비료가가공고효기응효복합격열재료。대기응효복합격열재료적미관결구、열물이성능급역학성능진행료표정화분석。결과표명：기응효납미입자균균분포재복합재료중，조성삼유망락결구，공경재70nm이하，비표면적재800-1000m2/g。열학성능현시，기응효복합재료재300℃적도열계수위0．03W/mK ，800℃/20min ，선수축＜1％；역학성능현시，압축강도위0．2M Pa。차외，복합재료구유우이적가공성능。
In view of thermal protection requirements in the high temperature field ,composite aerogel materials were fabricated by sol -gel method and supercritical drying technique .The thermal physical properties and microstructure , properties of aerogel composite insulation materials were characterized and analyzed .The results show that :aerogel nanoparticles were uniformly distributed in the composite materials ,w hich constituted infinite through channels and the hole diameter is below 70nm .Otherwise ,the specific surface area is 800 -1000m2/g . Thermal conductivity of aerogel is 0 .03W/mK ,line shrinkage is below 1% at 1200℃/20min .Composite aerogel materials’compression strength is 0 .2MPa ,and possess excellent machining .