	US 12,404,588 B2
	Method for manufacturing an abradable layer
Serge Georges Vladimir Selezneff, Moissy-Cramayel (FR); Philippe Charles Alain Le Biez, Moissy-Cramayel (FR); Arnaud Louis Gabriel Fregeac, Moissy-Cramayel (FR); Florence Ansart, Labege (FR); and Claude Gilbert Jean-Pierre Estournes, Rieumes (FR)
Assigned to SAFRAN AIRCRAFT ENGINES, Paris (FR); CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE, Paris (FR); and UNIVERSITE PAUL SABATIER—TOULOUSE III, Toulouse (FR)
Filed by SAFRAN AIRCRAFT ENGINES, Paris (FR); CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE, Paris (FR); and UNIVERSITE PAUL SABATIER—TOULOUSE III, Toulouse (FR)
Filed on Sep. 24, 2024, as Appl. No. 18/894,743.
Application 18/894,743 is a division of application No. 17/255,232, granted, now 12,129,553, previously published as PCT/FR2019/051510, filed on Jun. 20, 2019.
Claims priority of application No. 1855682 (FR), filed on Jun. 25, 2018.
Prior Publication US 2025/0011937 A1, Jan. 9, 2025
Int. Cl. C23C 24/08 (2006.01); C04B 41/00 (2006.01); C04B 41/45 (2006.01); B82Y 40/00 (2011.01); F01D 11/12 (2006.01)

CPC C23C 24/085 (2013.01) [C04B 41/0018 (2013.01); C04B 41/0072 (2013.01); C04B 41/4545 (2013.01); B82Y 40/00 (2013.01); F01D 11/122 (2013.01); F05D 2230/90 (2013.01); F05D 2240/55 (2013.01); F05D 2300/2118 (2013.01)]

13 Claims

1. A process for manufacturing a substrate coated with an abradable layer, the substrate being a turbomachine part and the process comprising:

forming the abradable layer on a surface of the substrate comprising a powder composition comprising at least micrometric ceramic particles having a number-average form factor greater than or equal to 3, a mass content of said micrometric ceramic particles in the powder composition being greater than or equal to 85%, the form factor of a particle being defined as the ratio [largest dimension of the particle]/[largest cross-sectional dimension of the particle], by heating said micrometric ceramic particles, as well as any nanometric ceramic particles that may be present to a first temperature T₁greater than or equal to 600° C. and while the assembly is brought to this first temperature T₁, increasing a compression pressure until it reaches, at a first time t₁, a plateau at a value Pc which corresponds to the compression pressure that will be applied during the sintering of the powder composition; then

increasing the temperature of the powder composition and the substrate to the sintering temperature T_freached at a second time t₂; then

maintaining the sintering temperature T_fand the compression pressure P_cuntil the third time t₃to obtain the abradable layer,

wherein a temperature imposed during sintering, the sintering time and the compression pressure applied are selected so as to obtain a volume porosity rate of the abradable layer greater than or equal to 20%.