Method and substrate for making composite material parts by...

C - Chemistry – Metallurgy – 04 – B

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C04B 35/80 (2006.01) B23K 26/38 (2006.01) B26F 1/26 (2006.01) B64C 25/42 (2006.01) C04B 35/83 (2006.01) F16D 65/12 (2006.01) F16D 69/02 (2006.01)

Patent

CA 2610160

The invention concerns a composite material part made by forming a fibrous preform (20), forming holes (22) extending in the preform from at least one side thereof, and densifying the preform with a matrix formed at least partly by a chemical vapour infiltration in gas phase (CVI). The holes (22) are formed by removing the material thereof by rupturing the fibers, for example by high-pressure jet machining, the fiber arrangement in the preform provided with holes being substantially unmodified relative to the original arrangement prior to the formation of the holes. The densification gradient is thus highly reduced, and a density may be obtained in a single densifying cycle which, in prior art, required several cycles separated by intermediate decrusting.

Une pièce en matériau composite est réalisée par formation d'une préforme fibreuse (20), formation de trous (22) s'étendant dans la préforme à partir d'au moins une face de celle-ci, et densification de la préforme par une matrice formée au moins partiellement par un processus de type infiltration chimique en phase gazeuse (CVI). Les trous (22) sont formés par enlèvement de la matière de celle-ci avec rupture des fibres, par exemple par usinage au jet d'eau sous pression, l'arrangement des fibres dans la préforme munie de trous étant sensiblement non modifié par rapport à l'arrangement initial avant formation des trous. Le gradient de densification est ainsi très réduit, et une densité peut être obtenue en un seul cycle de densification qui nécessitait, dans l'art antérieur, plusieurs cycles séparés par écroûtage intermédiaire.

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