Centre National De La Recherche Scientifique

Jean C Viala

Jean Bouix

Christiane F Vincent

Henri J Vincent

Jean L Ponthenier

Jacques Dazord

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.

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Villeurbanne, France

Jean C Viala