FIELD: chemistry.
SUBSTANCE: invention relates to sealing porous substrates with pyrolytic carbon through chemical infiltration using an installation for realising said method. One or more porous substrates to be sealed are loaded into a furnace. A reaction gas phase is fed to the input of the furnace, where the said gas phase contains a pyrolytic carbon precursor reaction gas which contains at least one gaseous hydrocarbon CXHy, where x and y are positive integers and 1<x<6 and a carrier gas containing at least one gas selected from methane and inert gases. Flue gas is collected from the output of the furnace and at least a portion of the gas stream extracted from the flue gas and containing the pyrolytic carbon precursor reaction gas is recycled into the reaction gas phase fed into the furnace. At least the amount of pyrolytic carbon precursor gas and carrier gas contained in the gas stream extracted from the flue gas is measured. Depending on the measured amount, at least flow of the said gas stream recycled into the reaction gas phase, flow from external source of the pyrolytic carbon precursor gas and carrier gas injected into the reaction gas phase, and obtaining the required level of content of the pyrolytic carbon precursor gas in the reaction gas phase fed to the input of the furnace are controlled.
EFFECT: lower cost of sealing porous substrates with pyrolytic carbon.
13 cl, 4 dwg
