Method for chemical infiltration in the gas phase for the densification of porous substrates with pyrolytic carbon

摘要

One or more porous substrates for densification (10 ) at least one gaseous hydrocarbon through the inlet (C _x H _y ) and carbon precursor and pyrolysis gas , methane and reaction doedoe seated in a vector containing a selected gas in the inert gas is injected into the gas phase in the oven (12), x and y is an integer and x is 1 & x & is a 6 . Exhaust gas containing the reaction product and the remaining gaseous components of the injected hydrogen is extracted from the oven, and ( circuit 80 in ) is recycled to the oven inlet to inject the gas phase reaction , at least a portion of the multi-core gas flow in the exhaust gas extraction the reagent -containing gas as the specific line on carbon , recycling is carried out after removal of hydrocarbon (step 40 ) contained in the exhaust gas .