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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、1 H-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。
The 3DCf / SiC high temperature oxidation composite was prepared by low molecular weight polycarbosilane (PCS) by a combination of precursor impregnation and pyrolysis (PIP), chemical vapor deposition (CVD) and powder sintering. The effects of low molecular weight PCS (low molecular weight PCS) and low molecular weight PCS (low molecular weight PCS) were studied by means of FTIR, 1 H-NMR, gel permeation chromatography (GPC), thermogravimetry- differential thermal analysis (TGA- DTA), X-ray diffraction (XRD) and transmission electron microscopy (TEM) Structure and its inorganic process. The results showed that the main structure of PCS was [-Si (CH3, H) -CH2-] n, the number average molecular weight was 420 and the ceramicization yield was about 70%. The microstructure of PCS was basically transformed into β- SiC; 3DCf / SiC composites and their components have good high temperature oxidation resistance.