Safran Ceramics

Centre National De La Recherche Scientifique

Universitë De Bordeaux

Simon Arnal

Lisa Pin

Francis Rebillat

Eric Bouillon

Fabrice Mauvy

Laurence Maille

Thomas Vandellos

Thibault Mouret

Lallie Claudie Régine Quemeras

A part made of coated composite material, includes a substrate made of ceramic matrix composite material; a tie-coat layer covering the substrate; and a protective coating on the tie-coat layer and defining an environmental barrier, the protective coating including a rare-earth silicate and including a first outer region including an outer surface of the protective coating opposite to the substrate and having a first working creep, having deformation of less than or equal to 0.07% when a compressive stress of at least 50 MPa is applied for a duration of 10 hours at a temperature of between 1050° C. and 1300° C. The first region includes a grain growth inhibitor; and a second, inner, environmental barrier region, including an interface of the protective coating with the tie-coat layer and having a second working creep.

Part made of composite material, having controlled creep

A part includes a substrate of ceramic matrix composite material, the substrate including silicon, the part further including an environmental barrier formed on at least one surface of the substrate, wherein the environmental barrier includes at least one compound selected from YbGdSiOand YbGdSiO, where γ is between 0.05 and 0.15, and wherein the environmental barrier further includes alumina AlO, the molar alumina content being between 5% and 15% of the total environmental barrier composition.

Environmental barrier for a substrate comprising free silicon

A method for coating a ceramic matrix composite part with an environmental barrier, the method including a) applying, to a surface of the part, a coating composition including a first powder of a rare earth silicate and a second powder including boron, the coating composition having a ratio R=[mass of the second powder]/[mass of the first powder] of between 0.1% and 5%, and b) sintering the first and second powders to obtain the environmental barrier on the part.

Method for coating a ceramic matrix composite part with an environmental barrier

A part includes a substrate, having, adjacent to a surface of the substrate, at least a portion that is made from a material that contains silicon, and an environmental barrier formed on the surface of the substrate, the environmental barrier including at least a first layer including a rare earth disilicate of formula RESiOpresent at a molar content lying in the range 70% to 99.9%, where REis a rare earth element; and at least one rare earth oxide of formula REOpresent at a molar content lying in the range 0.1% to 30%, where REis a rare earth element different from RE.

Part comprising a substrate and an environmental barrier

A part includes a substrate having, adjacent to a surface of the substrate, at least a portion that is made of a material that contains silicon, and an environmental barrier formed on the surface of the substrate, the environmental barrier including a first layer including at least one first rare earth silicate and presenting grains with a mean size less than or equal to 1 &#x3bc;m; and a second layer covering the first layer, the second layer including at least one rare earth silicate and presenting grains with a mean size greater than 1 &#x3bc;m.

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Bordeaux, France

Simon Arnal