Centre National De La Recherche Scientifique

Safran Ceramics

Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Universitë De Bordeaux

Laurence Maille

Eric Bouillon

Arnaud Delehouze

Adrien Delcamp

Patrick David

Amandine Lorriaux

Alexandre Allemand

Yann Le Petitcorps

Francis Rebillat

Sylvain Jacques

Simon Arnal

Jérôme Roger

Thierry Piquero

Thibault Mouret

Bernard Reignier

Pierre Broisson

Clémence Besnard

Olivier Ledain

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 process for manufacturing pyrocarbon, includes forming pyrocarbon by a calefaction process from at least one Cto Calcohol or polyalcohol precursor, the precursor being ethanol, rough laminar pyrocarbon being obtained by imposing a temperature of between 1250&#xb0; C. and 1325&#xb0; C. during calefaction.

Method for producing a pyrolytic carbon with predetermined microstructure

A process for manufacturing a friction component made of composite material, includes the densification of a fibrous preform of carbon yarns by a matrix including at least pyrocarbon and at least one ZrOCphase, where 1&#x2264;x&#x2264;2 and 0&#x2264;y&#x2264;1, the matrix being formed by chemical vapor infiltration at least from a first gaseous precursor of pyrocarbon and a second gaseous precursor including zirconium, the second precursor being an alcohol or a Cto Cpolyalcohol modified by linking the oxygen atom of at least one alcohol function to a group of formula &#x2014;Zr&#x2014;R, the substituents R being identical or different, and R being selected from: &#x2014;H, Cto Ccarbon chains and halogen atoms.

Process for manufacturing a composite friction component

Method for the preparation, by means of a heating technique, of a composite material composed of a matrix of at least a first oxide of at least one metal and/or at least one metalloid reinforced by reinforcements in at least a second oxide of at least one metal and/or at least one metalloid, characterised in that the following successive steps are carried out: the reinforcements are placed in at least one liquid precursor of the first oxide of at least one metal and/or at least one metalloid; said reinforcements and the liquid precursor are heated so as to form the first oxide by means of the thermal decomposition of said liquid precursor, and to deposit the first oxide thus formed around the reinforcements and between the reinforcements thus forming the matrix.

Method for preparing composite materials with an oxide matrix and oxide reinforcements by means of a calefaction process

A method of fabricating a ceramic material, the method including forming a ceramic material by performing a first chemical reaction at least between a first powder of an intermetallic compound and a reactive gas phase, a liquid phase being present around the grains of the first powder during the first chemical reaction, the liquid gas phase being obtained from a second powder of a metallic compound by melting the second powder or as a result of a second chemical reaction between at least one element of the first powder and at least one metallic element of the second powder, a working temperature being imposed during the formation of the ceramic material, which temperature is low enough to avoid melting the first powder.

Method of fabricating a ceramic from a chemical reaction

Growing community of inventors

Pessac, France

Laurence Maille