首页> 外文会议>7th Conference amp; Exhibition of the European Ceramic Society Pt.1, Sep 9-13, 2001, Brugge, Belgium >Si-C-O ceramics from preceramic polymers: Reaction mechanism between the Si-filler and the polymer derived matrix during pyrolytic conversion
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Si-C-O ceramics from preceramic polymers: Reaction mechanism between the Si-filler and the polymer derived matrix during pyrolytic conversion

机译:陶瓷前体聚合物制成的Si-C-O陶瓷:硅填料与聚合物衍生基体在热解过程中的反应机理

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摘要

Reactions of Si-filler powder with poly(methysilsesquioxane) during pyrolytic conversion into Si-C-O ceramics were investigated by means of high-resolution transmission electron microscopy including nanoanalytic methods. While up to 1000℃ no reactions were observed, above 1200℃ an interface reaction layer of nanosized β-SiC was formed. Due to the high fraction of open porosity (13 % at 1000℃ and 19 % at 1400℃) gas solid reactions involving SiO and CO dominate the interface reaction process of the filler/matrix boundary.
机译:利用包括纳米分析方法在内的高分辨率透射电子显微镜研究了硅填料粉末与聚甲基倍半硅氧烷在热解成Si-C-O陶瓷过程中的反应。在高达1000℃的温度下没有观察到反应,而在1200℃以上的温度下,形成了纳米级β-SiC的界面反应层。由于高孔隙率(1000℃下为13%,1400℃下为19%),涉及SiO和CO的气体固相反应主导着填料/基体边界的界面反应过程。

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