Method for producing parts made of a composite material with reinforcers

Abstract

The invention relates to a method of manufacturing a component made of composite material whereby the said component is obtained from a preform containing local reinforcers and a first resin of low viscosity, lower than 100 Pa.s,with which the said preform is impregnated. According to the invention, the method comprises the following steps: i) Creation of the said preform comprising a first fibrous material and the said local reinforcers being in the form of reinforcers formed of a second fibrous material having fibres of mechanical strength greater than that of the fibres of the first fibrousmaterial, so that they exhibit an elastic modulus or breaking stress at least 30% higher than that of the fibres of the said first fibrous material, the said second fibrous material being pre-impregnated with a thermoplastic, acrylic or polyamide polymer second resin having a glass transition temperature (Tg) above 80 DEG C, the amount of polymer second resin being comprised between 25% and 60% by volume with respect to the total volume of the said second fibrous material, ii) Impregnation of the said preform with the first impregnation resin, iii) Cooling of the said impregnated preform in order to obtain the component.

Description

technical field [0001] The invention relates to the field of composite materials for the manufacture of two-dimensional or three-dimensional parts. [0002] The invention relates more particularly to a method for the manufacture of parts made of composite material by impregnating a fibrous substrate (hereinafter denoted preform) with the aid of a weakly viscous polymeric resin, followed by a molding operation, and also to the process by implementing such Method for obtaining parts made of composite materials. Background technique [0003] A composite material is an assembly of at least two immiscible components. A synergistic effect is obtained by such an assembly, so that the obtained composite material has special mechanical and / or thermal properties, wherein each starting component does not have this mechanical and / or to a lesser extent compared to the composite material or thermal properties. [0004] Furthermore, the composite material comprises at least one reinforc...

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Problems solved by technology

[0015] Furthermore, the solution of reinforcements by deformation of the prefabricated part, among other solutions, usually does not guarantee the optimum mechanical properties of the composite part over its entire operating temperature range, especially when the operating temperature of the composite part is greater than The glass transition temperature (Tg) of the impregnating resin subsequently used to impregnate the preform and obtain the composite part

[0016] Finally, the solution of the reinforcement by deformation of the preform, among other solutions, generally cannot be made for amorphous thermoplastic resins with a glass transition temperature (Tg) lower than the temperature of the electrophoretic cycle or a melting point (M.p.) lower than Composite parts obtained by electrophoresis (a technique of deposition by electrophoresis of industrial coatings) of semi-crystalline resins at the temperature of the electrophoresis cycle, which can lead to decompaction of the composite