Office National D'etudes Et De Recherches Aerospatiales

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

Office National D'etudes Et De Recherches Aerospatiales (onera)

National D'etudes Et De Recherches Aerospatiales (onera)

Institut De Recherche/appliquee Sur Les Polymeres

Michel Parlier

Jean Jamet

Patrick Noireaux

Gilles Courtemanche

Bertrand Bloch

Michel Vaultier

Jean-Claude Cavalier

Marcel Ropars

Aurélie Julian-Jankowiak

Philippe Colomban

Jean-Marie Jouin

Marie-Hélène Ritti

Martine Menet

Emmanuelle Mouchon

Claude Muller

Erick Bouillon

Guy Larnac

Jean Phalippou

Marie-Helene Ritti

Marie-Pierre Bacos

Eric Framery

Bertrand Laine

Aurelie Julian-Jankowiak

The invention relates to a process for producing a ceramic matrix composite (CMC) part by infiltration of a suspension (S) of a ceramic powder into a fibrous reinforcement (). A suspension (S) of ceramic powder containing particles of chosen particle size, dispersed in at least one solvent, is prepared. The infiltration of the suspension is carried out in a single step in the fibrous reinforcement () positioned between a mold () and a permeable membrane (), which makes it possible to apply a vacuum (V) and to subsequently remove the solvent from the suspension through the permeable membrane (). The invention applies to the production of large-sized parts of complex shape, in particular in the field of aeronautics and aerospace engineering.

Process for producing a ceramic matrix composite part

Textile preforms sheathed in a boron nitride coating, composites incorporating them and their preparation

Woven or nonwoven long fiber sheets filled with two precursors each constituting an intermediate stage in a process for the preparation of a vitreous ceramic composition by the sol-gel route by hydrolysis and polycondensation using alcoholates or analogous compounds as the starting materials, that is to say an interface precursor in the form of a gel rich in water and a matrix precursor in the form of discrete particles capable of sintering at relatively low temperature, are stacked; the fibrous structure is compressed in the direction of stacking and the whole is heat-treated in order to convert the two precursors into a continuous matrix.

Multilayer fiber-matrix ceramic composite material and process for its

In the process according to the invention, a gel is prepared by hydrolysis and polycondensation of precursor compounds which comprise at least silicon alcoholate and aluminum alcoholate and inorganic compounds of lithium and/or magnesium, the solvent is removed, and the gel obtained is subjected to a heat treatment resulting in dehydration and oxidation, then to compacting and ceramisization. The composition obtained is substantially in the form of solid ceramic solutions, such as .beta.-spodumene, cordierite and mullite.

Glass-ceramic Li-Al-Si-O composition and process for its production

The matrix is formed by particles of ceramic material which are introduced into the empty spaces of a fibrous structure and are bonded to one another by bridges of ceramic material obtained by in situ pyrolysis of a liquid polymer. By means of this process, a composite material of low porosity, despite a high reduction in volume during pyrolysis, is obtained relatively rapidly.

Process for the production of a ceramic fiber/matrix composite material

Low viscosity, crosslinkable polysilanes that are liquid at ambient temperatures and essentially free of volatiles, well adapted for conversion into silicon carbide ceramics at elevated temperatures, are prepared by (a) reacting at least one silane monomer of the formula (1):

Low viscosity, crosslinkable liquid polysilanes

Growing community of inventors

Voisins Le Bretonneux, France

Michel Parlier