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3DCf/SiC抗高温氧化复合材料的制备及其构件的工程试验

, PP. 1264-1269

Keywords: 低分子量聚碳硅烷,先驱体浸渍裂解,3D,Cf/SiC复合材料,耐高温氧化,无机化过程

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Abstract:

采用低分子量聚碳硅烷(PCS)通过先驱体浸渍裂解(PIP)工艺、化学气相沉积(CVD)和粉末烧结技术相结合制备了3DCf/SiC抗高温氧化复合材料。运用FTIR、1H-NMR、凝胶渗透色谱法(GPC)、热失重-差热(TGA-DTA)、X射线衍射仪(XRD)和透射电子显微镜(TEM)等手段研究了低分子量PCS的结构及其无机化过程。结果表明:PCS的主要结构为[—Si(CH3,H)—CH2—]n,数均分子量为420,陶瓷化产率为70%左右,在1200℃时基本转化为微晶态的β-SiC;3DCf/SiC复合材料及其构件具有较好的耐高温氧化性能。

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