Snecma Propulsion Solide

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

Safran Ceramics

Alain Caillaud

Sébastien Bertrand

Franck Lamouroux

Stéphane Goujard

Francis Bagilet

Stéphane Mazereau

Eric Bouillon

Eric Philippe

Jean-Christophe Ichard

Jean-Luc Charvet

St&eacute;phane Goujard

Ren&eacute; Pailler

Robert Bagat

S&eacute;bastien Bertrand

Stephane Mazereau

Sebastien Bertrand

To densify thin porous substrates () by chemical vapor infiltration, the invention proposes using loading tooling () comprising a tubular duct () disposed between first and second plates () and around which the thin substrates for densification are disposed radially. The tooling as loaded in this way is then placed inside a reaction chamber () in an infiltration oven having a reactive gas admission inlet () connected to the tubular duct () to enable a reactive gas to be admitted into the duct which distributes the gas along the main faces on the substrates () in a flow direction that is essentially radial. The reactive gas can also flow in the opposite direction, i.e. it can be admitted into the tooling () from its outer envelope () and can be removed via the duct ().

Method of densifying thin porous substrates by chemical vapor infiltration, and a loading device for such substrates

An interphase coating is formed by chemical vapor infiltration (CVI) on the fibers constituting a fiber preform, the interphase coating comprising at least an inner layer in contact with the fibers for embrittlement relief to the composite material, and an outer layer for bonding with the ceramic matrix. The fiber preform is then kept in its shape by the fibers provided with the interphase coating and is consolidated by being impregnated with a liquid composition containing a ceramic precursor, and by transforming the precursor into a ceramic matrix consolidation phase. The consolidated preform is then densified by an additional ceramic matrix phase. No support tooling is needed for forming the interphase coating by CVI or for densification after consolidation using the liquid technique.

Method for making a part of composite material with ceramic matrix and resulting part

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

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Saint Caprais de Bordeaux, France

Alain Caillaud