Method of making fibrous preform and fibrous preform thus obtained

Abstract

The present invention relates to a method of making a fibrous preform in carbon and / or fibres of a carbon precursor, comprising : step a) of superposing at least two layers of carbon fibres and / or fibres of a carbon precursor according to a predefined superposition axis Z so as to form a multilayer body 2; step b) of needle-punching by means of least one first needle-punching device 10 the multilayer body 2 in a needle- punching direction substantially parallel to the superposition axis Z to arrange at least part of the fibres parallel to the superposition axis Z, so as to obtain a needle-punched multilayer body 3, an optional step c) of superposing with each other according to the superposition axis Z two or more of the needle-punched multilayer bodies 3, obtained separately by applying the above steps a) and b). The fibrous preform 1 consists of a single, multi-layer, needle-punched body 3 or two or more needle-punched multilayer bodies 3 superposed with each along the superpositionaxis Z. In the superposition step a), the multilayer body 2 is made by superposing one or more layers of fibre in the non-woven form NW on one or more layers of fibre in the woven form W. In the needle-punching step b) the first portion of the multilayer body 2 to encounter the needles 11 of the first needle-punching device 10 consists of at least one non-woven layer NW in order to prevent the needles 11 from directly engaging the fibres of the woven layers W underneath and in such a way that the fibres 20 to be arranged parallel to the superposition axis Z belong to the above first portion consisting of at least one layer of fibre in non-woven form N.

Description

technical field [0001] The invention relates to a method for producing a fiber preform and a fiber preform obtained thereby. [0002] The fiber preforms according to the invention can be used as reinforcing elements for components of C / C (carbon / carbon) braking systems, in particular as reinforcing elements for rotors / stators of disc brakes for automobiles or aerobrakes. In this case, densification is intended to obtain a carbon / carbon structure by impregnation with resins or pitches or by vapor deposition. Background technique [0003] It is well known in aviation and racing that braking systems are made using carbon / carbon (C / C) components, especially rotor / stator and disc brakes are made using carbon / carbon (C / C) components of. [0004] Carbon / carbon components consist of a carbon matrix in which carbon reinforcing fibers are arranged. [0005] Typically, carbon fibers or carbon precursor fibers are polymerized (either alone or with a binder such as a resin) to form a ...

AI Technical Summary

Problems solved by technology

[0022] Needling of fabrics improves the arrangement and number of fibers arranged in the plane of the disc, but involves forced damage to some of the fibers themselves, often degrading the mechanical and thermal characteristics in the plane of the disc in an uncontrollable manner

[0023] Therefore, to date, in the prior art, there is no method available for making preforms of carbon fibers that allows a controlled distribution of the fibers both in the main plane of the preform and in a plane orthogonal to such a plane. on, without causing damage to the fiber itself

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