Herakles

Centre National De La Recherche Scientifique

Universitë De Bordeaux

Safran Ceramics

Caroline Louchet

Arnaud Delehouze

Sébastien Bertrand

Franck Lamouroux

Francis Rebillat

Sylvain Jacques

Emilie Courcot

A part including a substrate in which at least a portion adjacent to a surface of the substrate is made of a refractory material containing silicon, is protected by an environmental barrier formed on the surface of the substrate and having at least a self-healing layer containing a rare earth silicate. The self-healing layer is formed: for at least 90 mol %, by a system constituted by 30 mol % to at most 80 mol % of at least one rare earth silicate RESiO, RE being a rare earth, and at least 20 mol % to 70 mol % of manganese oxide MnO; and for at most 10 mol %, by one or more oxides other than MnO, having a eutectic point with SiO2 less than or equal to 1595&#xb0; C.; the self-healing layer presenting a liquid phase having a self-healing function at least throughout the temperature range 1200&#xb0; C. to 1400&#xb0; C., while conserving a majority solid phase.

Environmental barrier for a refractory substrate containing silicon

A part made of ceramic matrix composite material has fiber reinforcement of carbon or ceramic fibers and a majority-ceramic sequenced matrix having first matrix layers made of crack-deflector material alternating with second matrix layers made of ceramic material. An interphase coating is interposed between the fibers and the matrix, and the interphase coating adheres to the fibers and to the matrix, and is formed of at least one sequence constituted by a first elementary layer made of carbon, possibly doped with boron, surmounted by a second elementary layer made of ceramic. The outer elementary interphase layer of the coating is a ceramic layer having an outer surface formed by ceramic grains of size lying essentially in the range 20 nm to 200 nm, with the presence of grains of size greater than 50 nm conferring roughness on the outer surface ensuring mechanical attachment with the adjacent matrix phase.

Ceramic matrix composite material part

Growing community of inventors

Arsac, France

Caroline Louchet