Societe Europeenne De Propulsion

Other

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

Aerospatiale Societe Nationale Industrielle

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

Messier Fonderie D'arudy

Roger Naslain

Rene Pailler

Louis G Heraud

Jean-Philippe Rocher

Jacques Thebault

Jacques Dunogues

Paul Hagenmuller

Jean-Paul Pillot

Marc Birot

Xavier Bourrat

Pierre Lespade

Alain Guette

Ren&eacute; Pailler

Jacky Minet

Michel Cataldi

Erik Menessier

Jean-Michel Quenisset

Francis Langlais

Patrick Pujol

Jacques Cotteret

Olivier Manfe

Rene Paillier

J Michel Quenisset

Patrice Reig

Gerard Demazeau

Frank Lamouroux

Pierre Lamico

Robert Colmet

Christian Robinbrosse

Preparation of mesophasic polyborazylene mesophasic polyborazylene and use as a BN precursor

High-temperature composite materials with carbon or carbon-coated fibre

The present invention relates to synthetic phyllosilicates having a lamellar structure of the type T--O--T devoid of OH.sup.- and F.sup.- ions. Said phyllosilicates are very resistant to oxidation and possess a high thermal stability. The invention further relates to a process for the preparation of said phyllosilicates.

Synthetic phyllosilicates and process for their preparation

A layer (16) forming interphase in a material having a lamellar structure is situated between the fibers of the texture and the matrix, and at least one layer (14) forming control interphase is situated between the surface of the fibers (10) and the lamellar interphase (16) in such a way as to define, for those cracks which have spread through the matrix (18) and the lamellar interphase (16), a preferential propagation zone away from direct contact with the actual fibers (10).

Composite material with multiple interphases between refractory

A method of manufacturing a composite material formed of a fibrous reinforcement and a silica based ceramic or vitro-ceramic matrix. The method includes impregnating the fibrous reinforcement by means of a sol-gel process wherein premature crystallization of the matrix obtained from the sol is hindered by addition to the sol of a crystallization retarding agent, and hot pressing the resulting material. The composite material formed has a residual porosity without the addition of nucleating agents of about less than 10%.

Method of manufacturing a composite material with vitroceramic or

A porous structure made of refractory fibers or densified by carrying out a sequential deposition of a matrix, the deposition comprising at least two chemical vapor infiltration phases of an essentially ceramic material separated by a chemical vapor infiltration of a less rigid material chosen among pyrolytic carbon and boron nitride.

Method for producing a ceramic matrix composite material having improved

The material is formed by a fibrous reinforcement constituted by a texture of carbon or silicon carbide fibers and a matrix deposited by chemical vapor infiltration through the porosity of the fibrous fabric and containing free carbon co-deposited with the zirconia, the weight proportion of free carbon co-deposited with the zirconia in the matrix being preferably between 0.1 and 10%. In comparison with pure or partly stabilized fritted zirconias, the composite zirconia according to the invention exhibits an improved tenacity, preservation of the mechanical strength and dimensional stability under high temperatures, as well as an improved density, without the introduction of the fibrous reinforcement reducing too excessively the properties of heat insulation and resistance to oxidation.

Composite material with zirconia matrix

Process for making composite materials consisting of a first reinforcing

A refractory fibrous preform in ceramic material is placed inside an infiltration chamber where it is heated within a reacting gaseous mixture introduced into the chamber and containing at least one gaseous hydrolyzing or oxidizing agent and a volatile hydrolyzable or oxidizable compound of the one element or of each element of which the oxide is a constituent of the matrix of the structure to be produced, in order to obtain by chemical reaction an adhesive deposit of said oxide or oxide constituting said matrix and having a melting point higher than 1750.degree. C.; the values of the overall pressure, of the temperature and of the gas flow rates inside the infiltration chamber are selected to be at a level slightly higher than the minimum values necessary for producing the said chemical reaction, so as to enable the constituents of the gaseous reaction mixture to penetrate to the bottom of the pores in the fibrous preform before having reacted completely such that the pores are densified throughout their length with the adhesive deposit.

Method for producing a refractory composite structure

Growing community of inventors

Pessac, France

Roger Naslain