Societe Europeenne De Propulsion

Alcatel Fibres Optiques

Le Carbone Lorraine

Pechiney Recherche

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

Lionel Vandenbulcke

Jacques Thebault

Claude Brehm

Jean-Yves Boniort

Stephane R Goujard

Bruno Lavigne

Henri Tawil

Pierre Bou

Christian Robin-Brosse

Jacques Rey

Jean-Claude Cavalier

Michel Coulon

St&eacute;phane Goujard

Jean-Luc Charvet

Alain Quilgars

Michel Moisan

David Rats

Renee Herbin

Yves Madec

Jean L Domblides

The invention concerns (1) thermochemically treating by pack-cementation a carbon-containing material, which may have an open porosity, to generate a refractory carbide coating on its surface and, if the material is porous, within the material; and (2) the use of specific alloys as a pack for thermochemically treating carbon-containing materials, optionally with an open porosity, in a halogenated atmosphere. Pack-cementation is carried out under reduced pressure using an element E (to be transported and to be reacted with the carbon in the material to generate the expected carbide) alloyed to an element M, and using a halide (chloride or fluoride, preferably a fluoride) of the same element M, of low volatility, present in the solid form.

Thermochemical treatment, in halogenated atmosphere, of a carbon-containing material

Method of applying an amorphous boron-based protective coating to an

Optical fiber coated with an amorphous boron protective layer, and a

The surface treatment of carbonaceous material (1) is characterised in that a layer of SiC (2) is formed on the carbonaceous material (1) by thermochemical conversion of the carbonaceous material (1) by a precursor of Si (4) at a temperature which is higher than the temperature for the formation, from said precursor, of a gaseous reactive intermediate (generally SiO), so as to obtain a surface layer (3) permitting an adherent diamond deposit (3). Pieces which are at least locally coated with `SiC/diamond`.

Surface treatment of carbonaceous material for making a subsequent

Apparatus for depositing diamond on a substrate assisted by microwave plasma, comprising two zones, a plasma formation zone located in a waveguide and a diamond deposition zone located outside the waveguide. The apparatus includes means making it possible to form a stable plasma in the deposition zone, so as to considerably increase the substrate surface which can be treated.

Apparatus for diamond deposition by microwave plasma-assisted CVPD

The manufacture of a refractory composite material protected against corrosion and comprising fibrous reinforcement densified by a matrix, comprises a step of forming, either within the matrix or at its surface, at least one continuous layer constituted by a ternary silicon-boron-carbon system obtained by chemical vapor deposition or infiltration. The elements silicon and boron are thereby distributed uniformly, with the boron content in the Si-B-C system being not less than 5% in atom percentage.

Process for the manufacture of a refractory composite material protected

A porous substrate is placed inside an enclosure and a gas flow is injected into the enclosure under predetermined conditions of temperature and pressure to form a solid deposit within the accessible pores inside the substrate. A wall that is permeable to the gas flow is interposed on the path of the flow between its inlet into the enclosure and the substrate, the wall not being in contact with the substrate, thereby forming around the substrate a region which is free from strong turbulence so that infiltration is performed essentially under diffusion conditions, thereby minimizing the deposition gradient within the volume of the substrate.

Chemical vapor infiltration method utilizing substantially diffusive

A composite material containing carbon is protected against oxidation by forming, on the composite material, an inner layer, an intermediate layer containing boron or a boron compound, and an outer layer of silicon carbide. The inner layer formed on the composite material before the intermediate layer is formed, is made of a refractory carbide that does not contain boron and that is at least 60 microns thick, said inner layer insulating the intermediate layer from the carbon contained in the composite material.

Method of providing anti-oxidation protection for a composite material

Growing community of inventors

Saint Jean le Blanc, France

Lionel Vandenbulcke