Process for smoothing the surface of a part made of CMC material
View Patent ↗A method of smoothing the surface of a ceramic matrix composite material part that presents a surface that is undulating and rough. The method includes depositing a refractory vitreous coating on the surface of the part, the vitreous coating essentially containing silica, alumina, baryte, and lime.
1. A part made of thermostructural composite material comprising fiber reinforcement made of refractory fibers and densified by a ceramic matrix, wherein an accessible surface of the part includes a vitreous coating comprising silica, alumina, BaO, and lime, and wherein the vitreous coating comprises, in percentages by weight, 55% to 70% of silica, 5% to 20% of alumina, 5% to 15% of BaO and 5% to 10% of lime.
2. A part according to claim 1 , wherein the vitreous coating also contains at least one additional compound selected at least from an alkaline-earth oxide and an alkali oxide.
3. A part according to claim 1 , further comprising a ceramic coating comprising a ceramic phase with a solid filler, the vitreous coating covering the ceramic coating.
4. A part according to claim 1 , constituting a gas turbine blade.
5. A turbomachine including a blade according to claim 4 .