Centre National De La Recherche Scientifique

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Christiane F Vincent

Jean Bouix

Henri J Vincent

Jean L Ponthenier

Jean C Viala

Jacques Dazord

David Cornu

Samuel Bernard

Jean-Christophe Pasquet

Pascaline Toutois

Lo&iuml;c Rousseau

B&eacute;rang&egrave;re Toury

Philippe Miel&eacute;

Herve Mourichoux

Marie-Paule Berthet

The invention concerns a method for making boron nitride fibers by drawing a polymer precursor and treating with ceramics the polymer fibers obtained by drawing. The invention is characterized in that the precursor polymer is obtained by thermal polymerization of a borazine of formula (I) wherein: R , R , R and R , identical or different, represent an alkyl, cycloalkyl or aryl group; and R represents a hydrogen atom or an alkyl, cycloalkyl or aryl group.

Method for making boron nitride fibers from aminoborazines

Improved device for continuously coating a carbon fiber fabric or similar with a carbide-based passivating protective layer, comprising:

Device for continuously coating a carbon fiber fabric with a

A process for continuously coating a strand of continuous carbon filaments by means of a refractory carbide by reactive technique which includes the step of causing the strand to travel under mechanical tension with a hermetic enclosure, simultaneously, introducing into the said enclosure a carbon free gas mixture consisting of hydrogen and of a volatile compound of an element capable of forming a refractory carbide; and heating the reaction mixture consisting of the strand and the gas mixture under controlled conditions so that the formation of the carbide deposit on the filaments takes place by a chemical reaction between the carbon in the filaments and the gas mixture. Under these controlled conditions, the reaction is self-regulated to produce a thin homogenous passivation coating on each filament.

Process for coating carbon fibers with a carbide

A process for continuously coating a strand of continuous carbon filaments by means of a refractory carbide by reactive CVD deposition, which includes the step of causing the strand to travel under mechanical tension with a hermetic enclosure, simultaneously, introducing into the said enclosure a gas mixture consisting of hydrogen and of a volatile compound of an element capable of forming a refractory carbide; and heating the reaction mixture consisting of the strand and the gas mixture so that the formation of the carbide deposit on the filaments takes place by a chemical reaction between the carbon in these filaments and the gas mixture; and the reaction is self-regulated by the diffusion of carbon through the layer of carbide already formed.

Process for coating carbon fibers with a carbide, and carbon fibers thus

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Lyons, France

Christiane F Vincent