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    • 7. 发明授权
    • Chemical vapor infiltration process of a pyrocarbon matrix within a
porous substrate with creation of a temperature gradient in the
substrate
    • 在多孔基材内的热解碳基质的化学气相渗透过程,在基质中产生温度梯度
    • US5789026A
    • 1998-08-04
    • US632487
    • 1996-04-25
    • Bernard DelperierJean-Luc Domblides
    • Bernard DelperierJean-Luc Domblides
    • C04B35/80C04B35/83C04B35/84C23C16/26
    • C04B35/806C04B35/83
    • The substrate (10) is placed in an enclosure (12) and is heated so as to establish a temperature gradient within the substrate such that the substrate has a temperature in its portions remote from its exposed surfaces that is greater than its temperature at said surfaces. A gas constituting a precursor of carbon and comprising at least one saturated or unsaturated hydrocarbon is admitted into the enclosure, with the formation of pyrolytic carbon be favored in the higher temperature portions of the substrate. The gas comprises a mixture containing at least one saturated or unsaturated hydrocarbon and hydrogen, and the substrate is heated in such a manner as to establish a temperature gradient within the substrate on either side of a temperature of 1500 K, with hydrogen having an inhibiting role at temperatures below 1500 K.
    • PCT No.PCT / FR94 / 01074 Sec。 371日期:1996年4月25日 102(e)日期1996年4月25日PCT提交1994年9月14日PCT公布。 公开号WO95 / 11867 日期1995年5月4日将衬底(10)放置在外壳(12)中并被加热以便在衬底内建立温度梯度,使得衬底的远离其暴露表面的部分的温度大于其 所述表面的温度。 构成碳前体并含有至少一种饱和或不饱和烃的气体进入外壳,热解碳的形成在基材的较高温度部分受到青睐。 气体包括含有至少一种饱和或不饱和烃和氢的混合物,并且以这样一种方式加热底物,以便在1500K温度的两侧在衬底内建立温度梯度,其中氢具有抑制作用 温度低于1500K。