【作者】 孙陈诚； 胡子君； 李同起； 张宏波； 孙志杰； 张佐光；

【Author】 Sun Chencheng~1,Hu Zijun~1,Li Tongqi~1,Zhang Hongbo~1,Sun Zhijie~2,Zhang Zuoguang~2 (1 National Key Laboratory of Advanced Functional Composite Materials,Aerospace Research Institute of Materials and Processing Technology,Beijing 100076; 2 School of Materials Science and Engineering,BeiHang University,Beijing 100083)

【机构】 先进功能复合材料技术国防科技重点实验室航天材料及工艺研究所； 北京航空航天大学材料科学与工程学院；

【摘要】 以正硅酸乙酯为硅源经两步法制备溶胶,与短纤维复合制备短纤维增强气凝胶隔热材料,改变了纤维用量和凝胶组成。结果表明,气凝胶为纳米多孔网络结构;同样的凝胶组成,隔热材料的热导率随着纤维用量的增加而变大;同样的纤维用量,隔热材料的热导率随着乙醇用量的增多有变大的趋势。更多还原

【Abstract】 Chopped ceramic fibers reinforced SiO₂ aerogel were prepared by impregnating aerogel into ceramic fibers using the sol-gel process and supercritical drying technique.Factors of Fiber content and gel composition were studied.The results showed that SiO₂ aerogel is a special material with nano-structure.In the case of same gel,thermal conductivity of materials increased as fiber content increased.When fiber content was same,thermal conductivity of materials with more ethanol was bigger than that of little ethanol.更多还原