Societe Nationale D'etude Et De Construction De Moteurs D'aviation-snecma

St&eacute;phane Goujard

Jacques Thebault

Lionel Vandenbulcke

Christian Robin-Brosse

Alain Caillaud

Jean-Luc Charvet

Ren&eacute; Pailler

Yves Madec

S&eacute;bastien Bertrand

The invention concerns (1) thermochemically treating by pack-cementation a carbon-containing material, which may have an open porosity, to generate a refractory carbide coating on its surface and, if the material is porous, within the material; and (2) the use of specific alloys as a pack for thermochemically treating carbon-containing materials, optionally with an open porosity, in a halogenated atmosphere. Pack-cementation is carried out under reduced pressure using an element E (to be transported and to be reacted with the carbon in the material to generate the expected carbide) alloyed to an element M, and using a halide (chloride or fluoride, preferably a fluoride) of the same element M, of low volatility, present in the solid form.

Thermochemical treatment, in halogenated atmosphere, of a carbon-containing material

The material comprises fiber reinforcement made of fibers that are essentially constituted by silicon carbide, and an interphase layer between the fibers of the reinforcement and the matrix. The reinforcing fibers are long fibers containing less than 5% atomic residual oxygen and they have a modulus greater than 250 GPa, and the interphase layer is strongly bonded to the fibers and to the matrix such that the shear breaking strengths within the interphase layer and at the fiber-interphase bonds and at the interphase-matrix bonds are greater than the shear breaking strengths encountered within the matrix.

Composite material with ceramic matrix and SiC fiber reinforcement, method for making same

Growing community of inventors

Merignac, France

Stéphane Goujard

Growing community of inventors

Merignac, France

St&eacute;phane Goujard

Stéphane Goujard