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 |
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.
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