Method for chemical infiltration in the gas phase for the...

C - Chemistry – Metallurgy – 23 – C

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C23C 16/04 (2006.01) C23C 16/26 (2006.01)

Patent

CA 2595498

One or more porous substrates (10) for densification are placed in an oven (12) with admission of a reacting gas phase through the inlet thereof, containing a gaseous precursor of pyrolytic carbon with at least one gaseous hydrocarbon CxHy in which x and y are whole numbers and x is such that 1 < x < 6, and a vector gas selected from methane and inert gases. The effluent gas, comprising residual components of the inlet gas phase and reaction products, of which hydrogen is extracted from the oven and recycled (circuit 80) to the inlet reaction gas phase at the oven inlet, a fraction at least of an extract gas flow from the effluent gas, containing reactant gas as a precursor to pyrolytic carbon, the recycling being carried out after removal of heavy hydrocarbons (process 40) contained in the effluent gas.

Un ou plusieurs substrats poreux à densifier (10) sont chargés dans un four (12) en entrée duquel est admise une phase gazeuse réactionnelle contenant un gaz précurseur de carbone pyrolytique comprenant au moins un hydrocarbure gazeux CxHy dans lequel x et y sont des nombres entiers et x est tel que 1 < x < 6, et un gaz vecteur comprenant au moins un gaz choisi parmi le méthane et des gaz neutres. Le gaz effluent contenant des constituants résiduels de la phase gazeuse admise et des produits de réaction, dont l'hydrogène, est extrait du four et on recycle (circuit 80) dans la phase gazeuse réactionnelle admise en entrée du four, une fraction au moins d'un flux gazeux extrait du gaz effluent et contenant du gaz réactif précurseur de carbone pyrolytique, le recyclage étant effectué après élimination d'hydrocarbures lourds (traitement 40) contenus dans le gaz effluent.

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