Office National D'etudes Et De Recherches Aerospatiales

National D'etudes Et De Recherches Aerospatiales (onera)

Institut De Recherche/appliquee Sur Les Polymeres

Jean Jamet

Michel Parlier

Patrick Noireaux

Bertrand Bloch

Claude Muller

Marie-Helene Ritti

Erick Bouillon

Marie-Pierre Bacos

Jean Phalippou

Guy Larnac

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

Carignan de Bordeaux, France

Jean Jamet