METHOD AND SUBSTRATE FOR MAKING COMPOSITE MATERIAL PARTS BY CHEMICAL VAPOUR INFILTRATION DENSIFICATION AND RESULTING PARTS

摘要

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.