Method for making carbon fibre preforms

Details Method for making carbon fibre preforms Method for making carbon fibre preforms

D - Textiles, Paper

01

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D01F 9/08 (2006.01) C04B 35/00 (2006.01) C04B 35/83 (2006.01) D01F 11/10 (2006.01) D01F 11/14 (2006.01) D02G 1/02 (2006.01) D02J 1/22 (2006.01) D02J 13/00 (2006.01) D04H 13/00 (2006.01) F16D 69/02 (2006.01)

Patent

CA 2307137

The invention concerns a method for making a carbon fibre preform which consists in using at least one yarn or cable formed of continuous fibres derived from carbon precursor fibres previously subjected to an intermediate carbonization such that the fibres have a carbon ratio between 70 % and 90 % and having a tensile failure resistance not less than 3000 MPa's after they have been entirely carbonized without necessarily having been tensioned, and in using the slightly twisted yarn or cable for making the preform, before subjecting it to a thermal treatment to complete the transformation of the continuous fibres into carbon fibres. The yarn or cable can be subjected to a drawing-cracking process to obtain a yarn or cable formed of discontinuous fibres whereof the cohesion is ensured by slight twisting, or by taping.

Pour fabriquer une préforme en fibres de carbone, on utilise au moins un fil ou câble formé de fibres continues issues de fibres de précurseur de carbone ayant subi une carbonisation intermédiaire telle que les fibres ont un taux de carbone compris entre 70 % et 90 % et présenteront une résistance à une rupture en traction au moins égale à 3 000 MPa après que leur carbonisation ait été complétée sans nécessairement être mises en tension, et on utilise le fil ou câble légèrement retordu pour fabriquer la préforme, avant de soumettre celle-ci à un traitement thermique afin de compléter la transformation des fibres discontinues en fibres de carbone. Le fil ou câble de départ peut être soumis à une opération d'étirage-craquage de manière à obtenir un fil ou câble formé de fibres discontinues dont la cohésion nécessaire est assurée par une légère retorsion, ou par guipage.

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