Chemical vapour infiltration method for densifying porous...

C - Chemistry – Metallurgy – 23 – C

Patent

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C23C 14/04 (2006.01) C04B 41/45 (2006.01) C23C 8/00 (2006.01) C23C 8/20 (2006.01) C23C 10/06 (2006.01) C23C 16/04 (2006.01) C23C 16/455 (2006.01) C23C 16/458 (2006.01) C23C 16/44 (2006.01)

Patent

CA 2440063

Annular substrates (20) are stacked in an enclosure where they define an inside volume (24) and an outer volume (26) outside the stack. A gas containing at least one precursor of a matrix material to be deposited within the pores of the substrates is channeled inside the enclosure to a first one (24) of the two volumes, and a residual gas is extracted from the enclosure from the other one (26) of the volumes. One or more leakage passages (22) allow the volumes to communicate with each other, other than through the substrates. The total section of the leakage passages has a value lying between a minimum value for ensuring that a maximum gas pressure in the first volume is not exceeded until the end of densification, and a maximum value such that a pressure difference is indeed established between the two volumes from the beginning of densification.

Des substrats annulaires (20) sont disposés en pile dans une enceinte où ils délimitent un volume interne (24) et un volume externe (26) à la pile. Une phase gazeuse contenant au moins un précurseur d'un matériau de matrice à déposer au sein de la porosité des substrats est canalisée dans l'enceinte vers un premier (24) des deux volumes et une phase gazeuse résiduelle est extraite de l'enceinte à partir de l'autre volume (26). Un ou plusieurs passages de fuite (22) font communiquer les volumes entre eux, en dehors des substrats. La section totale des passages de fuite est comprise entre une valeur minimale telle qu'une pression maximum de phase gazeuse dans le premier volume ne soit pas dépassée jusqu'à la fin de la densification, et une valeur maximale telle qu'une différence de pression soit établie entre les deux volumes dès le début de la densification.

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