Controlling or modeling a chemical vapor infiltration...

Details Controlling or modeling a chemical vapor infiltration... Controlling or modeling a chemical vapor infiltration...

C - Chemistry, Metallurgy

23

C

C23C 16/26 (2006.01) C04B 35/83 (2006.01) C23C 16/44 (2006.01) G05B 1/00 (2006.01)

Patent

CA 2523927

A charge comprising one or several porous substrates (10) to be densified is heated in an oven wherein a reactive gas phase containing at least one carbon- precursor hydrocarbon is admitted, the effluent gases are extracted from the oven via an extraction duct (27) which is connected to the exit of said oven. The effluent gas content of at least one compound chosen from allene, propyne and benzine, is measured. According to the content thus measured, the method is controlled by adjusting at least one parameter selected from the following: the flow rate of the reactive gaseous phase admitted into the oven, the flow rate of at least one constituent of the gaseous phase admitted into the oven; the residence time of the gaseous phase in the oven; the heating temperature of the substrate (s) and the pressure prevailing in the oven. Adjustment of at least one parameter is carried out in such a way as to keep the measured content to a substantially constant value. It is thus possible to model or control a densification process in real time.

Un chargement comprenant un ou plusieurs substrats poreux (10) à densifier est chauffé dans un four dans lequel une phase gazeuse réactionnelle contenant au moins un hydrocarbure précurseur de carbone est admise, les gaz effluents sont extraits hors du four par une conduite d'extraction (26) reliée à une sortie du four. On mesure la teneur des gaz effluents en au moins un composé choisi parmi l'allène, le propyne et le benzène ; et, en fonction de la teneur mesurée, on commande le procédé par réglage d'au moins un paramètre choisi parmi le débit de phase gazeuse réactionnelle admise dans le four, le débit d'au moins un constituant de la phase gazeuse admise dans le four ; le temps de séjour de la phase gazeuse dans le four ; la température de chauffage du ou des substrats et la pression régnant dans le four. Le réglage d'au moins un paramètre est réalisé de manière à maintenir la teneur mesurée à une valeur sensiblement constante. On peut ainsi commander en temps réel ou modéliser un processus de densification.

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