Snecma Moteurs

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

Jean-Michel Georges

Dominique Coupe

Eric Philippe

Michel Laxague

Jean-Michel Guirman

Daniel Benethuiliere

Jean-Marc Domergue

A method manufacturing a one-piece bowl of thermostructural composite material comprising fiber reinforcement densified by a matrix. The method comprises supplying deformable fiber plies that are whole, being free from slots or cutouts, superposing said plies on a former of shape corresponding to the bowl to be made, deforming the plies, and bonding the superposed plies to one another by means of fibers extending transversely relative to the plies, e.g. by needling so as to obtain a bowl preform which is then densified. The bowl () can be used as a support for a crucible () in an installation for producing monocrystalline silicon.

Method for making a bowl in thermostructural composite material

A composite material bowl comprising fiber reinforcement densified by a matrix is made by winding a yarn on a preform having an axial passage through its bottom, densifying the preform by chemical vapor infiltration, and closing the passage by a plug . Prior to densification, the preform can be consolidated. A final chemical vapor infiltration step can be performed after the plug has been put into place.

Method of manufacturing a thermostructural composite material bowl, in particular for an installation that produces silicon single crystals

A friction element is made out of a composite material comprising carbon fiber reinforcement and a matrix which, at least in the vicinity of the or each friction face, comprises: a first phase in the vicinity of the reinforcing fibers and containing pyrolytic carbon obtained by chemical vapor infiltration; a refractory second phase of carbon or ceramic obtained at least in part by pyrolysis of a liquid precursor; and a silicon carbide phase obtained by siliciding, for example. At least in the vicinity of the or each friction face, the composite material is preferably constituted, by volume, at least as follows: 15% to 35% carbon fibers; 10% to 55% first matrix phase containing pyrolytic carbon; 2% to 30% second matrix phase of refractory material; and 10% to 35% silicon carbide. The invention is applicable in particular to braking for rail or road vehicles.

Friction element in composite carbon/carbon-silicon carbide material and method for manufacturing same

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Blanquefort, France

Jean-Michel Georges