Composite material part with a silicon-containing ceramic matrix protected against corrosion
AssigneeSnecma Propulsion Solide
InventorsCaroline Louchet-Pouillerie, Henri Tawil, Eric Bouillon
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Abstract
An environmental barrier for a substrate of ceramic matrix composite material containing silicon, in particular containing SiC, is formed by an anticorrosion protection layer containing an aluminosilicate type compound of an alkali or alkaline-earth or rare earth element, e.g. BSAS, with a chemical barrier forming layer of aluminum nitride being interposed between the substrate and the anticorrosion protection layer.
Claims20
A method of forming an environmental barrier on a substrate of ceramic matrix composite material containing silicon, the method comprising forming an anticorrosion protection layer of an aluminosilicate type compound of an alkali or alkaline-earth or rare earth element, the method being characterized in that a chemical barrier forming layer of aluminum nitride is interposed between the substrate and the anticorrosion protection layer, wherein the aluminum nitride layer is formed directly on the substrate and the anti-corrosion layer is formed directly on the aluminum nitride layer, and wherein the anti-corrosion layer is formed of an aluminosilicate compound of an alkali, alkaline earth, or rare-earth element.
A part comprising a composite material substrate with a ceramic matrix containing silicon and an environmental barrier formed on the substrate and comprising an anticorrosion protection layer containing an aluminosilicate type compound of an alkali or alkaline-earth or rare-earth element, the part being characterized in that a layer of aluminum nitride is interposed between the substrate and the anticorrosion protection layer, wherein the aluminum nitride layer is formed directly on the substrate and the anti-corrosion layer is formed directly on the aluminum nitride layer, and wherein the anti-corrosion layer is formed of an aluminosilicate compound of an alkali, alkaline earth, or rare-earth element.
Dependencies are inferred from the claim text.