US 11,674,219 B1
Method for densifying composite matertals
Jean-François Daniel René Potin, Moissy Cramayel (FR); Arnaud Delehouze, Moissy Cramayel (FR); and Stéphane Roger André Goujard, Moissy Cramayel (FR)
Assigned to SAFRAN CERAMICS, Le Haillan (FR)
Appl. No. 17/913,731
Filed by SAFRAN CERAMICS, Le Haillan (FR)
PCT Filed Mar. 19, 2021, PCT No. PCT/FR2021/050463
§ 371(c)(1), (2) Date Sep. 22, 2022,
PCT Pub. No. WO2021/198582, PCT Pub. Date Oct. 7, 2021.
Claims priority of application No. 2003120 (FR), filed on Mar. 30, 2020.
Int. Cl. C23C 16/04 (2006.01); C23C 16/455 (2006.01); C23C 16/44 (2006.01); B01D 53/24 (2006.01); C04B 35/83 (2006.01); C04B 35/628 (2006.01); F16D 69/02 (2006.01); C23C 16/26 (2006.01)
CPC C23C 16/045 (2013.01) [B01D 53/24 (2013.01); C04B 35/62873 (2013.01); C04B 35/62884 (2013.01); C04B 35/83 (2013.01); C23C 16/26 (2013.01); C23C 16/4412 (2013.01); C23C 16/45593 (2013.01); F16D 69/023 (2013.01); C04B 2235/422 (2013.01); C04B 2235/5248 (2013.01); C04B 2235/5252 (2013.01); C04B 2235/614 (2013.01); F16D 2200/0052 (2013.01); F16D 2200/0065 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A method for densifying one or more porous substrates with pyrolytic carbon by chemical vapour infiltration, comprising:
admitting, at an inlet of a densification furnace, a reactive gaseous phase comprising at least one pyrolytic carbon precursor;
reacting at least a fraction of the reactive gaseous phase with the one or more porous substrates;
extracting, at an outlet of the densification furnace, gaseous effluents originating from the reactive gaseous phase;
reintroducing, with the reactive gaseous phase admitted at the inlet of the densification furnace, at least a fraction of the gaseous effluents extracted at the outlet of the furnace;
wherein the fraction of the gaseous effluents introduced with the reactive gaseous phase comprises at least one polyaromatic hydrocarbon compound.