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Densification of fibrous structures by resin transfer moulding for making thick parts of composite material

A technology of fiber structure, composite materials, used in parts of aviation and space or other fields, the field of composite materials to manufacture thick parts, can solve the problems of increasing duration and processing cost

Inactive Publication Date: 2007-11-28
GERAKL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of implementing this method industrially is that the resin pre-impregnation and polymerization in the autoclave after draping or winding is carried out in several consecutive steps
Porosity can actually be reduced by repeating the prepreg and polymerisation cycle several times, but this in turn will add significantly to duration and cost of treatment

Method used

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  • Densification of fibrous structures by resin transfer moulding for making thick parts of composite material
  • Densification of fibrous structures by resin transfer moulding for making thick parts of composite material
  • Densification of fibrous structures by resin transfer moulding for making thick parts of composite material

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Embodiment Construction

[0032] The first step 10 of the method consists in preparing the reinforced fiber structure constituting the composite material part to be manufactured. The fibrous structure may take the form of a three-dimensional (3D) fibrous preform, the shape of which corresponds to the shape of the part to be manufactured and which itself exhibits sufficient cohesion to enable it to be handled without losing its cohesion. In a known manner, such a 3D fiber pre-product may be a felt, or it may be obtained from three-dimensional weaving, braiding or braiding, or by overlapping two-dimensional (2D) layers and bonding them together. A 2D layer may take the form of a braid, or a unidirectional (UD) sheet, or a multidirectional sheet consisting of several UD sheets superimposed in different directions and bonded to each other. The 2D layers can be bonded together by needling, stitching, or actually inserting rigid elements or threads through the layers.

[0033] For example, reference may be ...

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Abstract

The invention relates to a method of placing a reinforced fiber structure for forming a part to be manufactured in a mold (22) having at least one wall formed by a flexible film and injecting a resin composition into the mold , the composition has a volatile material content of less than 25% by weight and allows a temperature value of its viscosity in the range of 0.1 Pas to 0.3 Pas. The polymerisation of the resin is carried out in a mold placed inside a hood (20), with a gradual increase in temperature and comprising at least one final polymerisation stage under pressure, in order to obtain a resin composed of Components made of composite materials.

Description

technical field [0001] The present invention relates to the manufacture of composite material parts with fiber reinforcement and a resin matrix by using the method of injecting resin under pressure, also known as resin transfer molding (RTM). [0002] The field of application of the invention is especially the manufacture of thick components from composite materials. As an example of such a component, mention may be made of the diverging parts of rocket motor nozzles, such as those made of composite material with carbon fiber reinforcement and a phenolic resin matrix. Of course, the invention is applicable to the manufacture of a wide variety of components, whether for rocket or aircraft engines, or more generally for aeronautics and space or other fields. Background technique [0003] A technique commonly used to manufacture thick parts of composite materials consists in the steps of using resin-pre-impregnated layers or strips of braid or other fibrous structure, draping ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C70/54B29C70/44
CPCB29C70/546B29C70/443
Inventor B·布特弗M·多什尔M-L·法热J-P·科舒瓦
Owner GERAKL
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