【摘 要】
：
To modify the oxidative-resistantability of carbon fiber reinforced carbon aerogelthermal insulators, Si-C-Oprecursor sol was prepared with dimethyldiethoxylsilane (DMDES) and methyltrimethoxysilane (
【机 构】
：
Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, National University of
【出 处】
：
2014中国溶胶-凝胶学术研讨会暨国际论坛
论文部分内容阅读
To modify the oxidative-resistantability of carbon fiber reinforced carbon aerogelthermal insulators, Si-C-Oprecursor sol was prepared with dimethyldiethoxylsilane (DMDES) and methyltrimethoxysilane (MTMS) as raw materials.Carbon aerogel compositewas impregnated with the SiCO sol, after gelation, aging, solvent exchange, drying and pyrolysis, inner Si-C-O coating was deposited in the carbon aerogel composites, repeating the cycle for anti-oxidationcompositeswith different integrationtimes.Results show that, after integration three times, density increases from 0.20 g/cm3 to 0.77g/cm3and thermalconductivity rises from 0.11 W/m·K to 0.33W/m.K at 25℃.After 1600℃ 20min heat treatment in air, weight lossof composites obtained by integrating three times is 10.33%, with a linear shrinkage of 1.16%.It indicates that infiltrating organic silicon sol and carbonizingto form coatingin nano-porous carbon aerogel composites can improve the oxidation resistanceevidently.
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