Chemical vapour infiltration process of a pyrocarbon matrix...

C - Chemistry – Metallurgy – 04 – B

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C04B 35/84 (2006.01) C04B 35/52 (2006.01) C04B 35/83 (2006.01) C23C 16/22 (2006.01)

Patent

CA 2175041

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.

Le substrat (10) est placé dans une enceinte (12) et chauffé de façon à permettre l'établissement d'un gradient de température au sein du substrat de sorte que celui-ci présente une température plus élevée dans des parties éloignées de ses surfaces exposées qu'au niveau de celles-ci. Une phase gazeuse précurseur du carbone comprenant au moins un hydrocarbure saturé ou insaturé, est admise dans l'enceinte, la formation du pyrocarbone étant favorisée dans les parties du substrat de température plus élevée. La phase gazeuse comprend un mélange constitué d'au moins un hydrocarbure saturé ou insaturé et d'hydrogène, et le substrat est chauffé de sorte qu'il s'établisse en son sein un gradient de température de part et d'autre d'une température de 1500 DEG K, l'hydrogène ayant un rôle inhibiteur à une température inférieure à 1500 DEG K.

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