US 11,814,325 B2
Method for coating a ceramic matrix composite part with an environmental barrier
Simon Arnal, Moissy-Cramayel (FR); and Lisa Pin, Moissy-Cramayel (FR)
Assigned to SAFRAN CERAMICS, Le Haillan (FR)
Appl. No. 17/908,137
Filed by SAFRAN CERAMICS, Le Haillan (FR)
PCT Filed Feb. 25, 2021, PCT No. PCT/FR2021/050330
§ 371(c)(1), (2) Date Aug. 30, 2022,
PCT Pub. No. WO2021/176164, PCT Pub. Date Sep. 10, 2021.
Claims priority of application No. 2002156 (FR), filed on Mar. 3, 2020.
Prior Publication US 2023/0121823 A1, Apr. 20, 2023
Int. Cl. C04B 41/00 (2006.01); C04B 41/50 (2006.01); C04B 41/45 (2006.01); C04B 41/52 (2006.01); C04B 41/87 (2006.01); C04B 41/89 (2006.01); C23C 24/10 (2006.01)
CPC C04B 41/5024 (2013.01) [C04B 41/009 (2013.01); C04B 41/0072 (2013.01); C04B 41/4545 (2013.01); C04B 41/522 (2013.01); C04B 41/87 (2013.01); C04B 41/89 (2013.01); C23C 24/10 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A method for coating a ceramic matrix composite part with an environmental barrier, the method comprising:
a) applying, to a surface of the part, a coating composition comprising a first powder of a rare earth silicate and a second powder comprising boron, the coating composition having a ratio R=[mass of the second powder]/[mass of the first powder] of between 0.1% and 5%, wherein the second powder comprises a boron carbide powder, and
b) sintering the first and second powders to obtain the environmental barrier on the part, the second powder being a fluxing agent and making the coating composition viscous to accommodate stresses and prevent cracking of the environmental barrier during sintering.