碳布缝合预制体孔隙与热解碳沉积时变相依的多尺度研究
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航天材料及工艺研究所,先进功能复合材料技术重点实验室

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TB3

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Multi鄄Scale Relationship of Pores in Carbon Cloth StitchedPreform and Deposition of Pyrocarbon
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    摘要:

    以甲烷为前驱体,碳布缝合织物为预制体,采用等温化学气相渗透(ICVI) 工艺,在1 368 K 温度
    和1 s 滞留时间下制备了C/ C 复合材料。采用压汞仪表征不同致密化时间下预制体的孔隙分布,采用偏光显
    微镜观察热解碳的结构。结果表明:预制体的孔隙分布呈现多峰分布,热解碳的沉积速率与[ A / V] 值成反比,
    热解碳的结构与预制体的比表面积相关,沉积初期比表面积较大时,得到的热解碳织构为各相同性和低织构热
    解碳,随着沉积的进行,比表面积逐渐减小,在纤维束的边沿等部位出现了高织构热解碳。

    Abstract:

    Isothermal chemical vapor infiltration(ICVI) was used to study carbon cloth stitched preform densifi鄄
    cation process,methane was the precursor,at the temperature of 1 368 K and residence time of 1 s. Carbon cloth
    stitched preform porosity distribution under different time was characterized by mercury porosimetry, and the pyrocar鄄
    bon structure was observed by PLM. It is found that the porosity presented multipeek shape,and pyrocarbon deposition
    rate and [A / V]value showed a inverse correlation throughout the whole study process. The texture of the pyrocarbon
    had a relationship with the specific surface area. Isotropic and low textured pyrocarbon was first got at the initial of in鄄
    filtration,then high textured pyrocarbon was discovered at larger size pores like the edge of the bundle.

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房金铭.碳布缝合预制体孔隙与热解碳沉积时变相依的多尺度研究[J].宇航材料工艺,2015,45(5).

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  • 在线发布日期: 2016-11-28
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