Method for producing a composite component formed with a fibre-reinforced plastic component on which at least one surface with a coating is formed

Abstract

At least one surface of a FRP component is coated by impregnating a structure formed with textile fibres with a flowable polymeric matrix material so the fibres are completely covered to form the coating, a thickness of the flowable polymeric matrix material above the fibres of at least 100 μm and at least one ply of pull-off fabric, mesh or gauze is laid on and wetted or impregnated completely with the flowable polymeric matrix material. The polymeric matrix material is cured then the at least one ply of pull-off fabric, mesh or gauze is removed by peeling and in this region a surface of increased roughness is obtained so between the surface of increased roughness and fibres there is a layer formed with the cured polymeric matrix material, having a thickness of at least 100 μm. Coating the increased roughness surface with a thermal spraying process.

Claims

1. Method for producing a composite component constructed from a fibre-reinforced plastics component FRP on which at least one surface with a coating is formed, consisting of the steps of: impregnating a structure formed with textile fibres with a flowable polymeric matrix material such that the textile fibres are completely covered by the flowable polymeric matrix material and in a region of the surface that is to be provided with coating, a thickness of the flowable polymeric matrix material above the textile fibres of at least 100 μm is maintained; providing at least one ply of a pull-off fabric, a mesh or a gauze to be laid on and wetted or impregnated completely with the flowable polymeric matrix material then curing the polymeric matrix material and the at least one ply of the pull-off fabric, mesh or gauze is removed by peeling and consequently in this region a surface of increased roughness is obtained such that between the surface of increased roughness and the textile fibres there is a layer formed with the cured polymeric matrix material, having a thickness of at least 100 μm and no textile fibers are exposed and subsequently the coating on the cured polymeric matrix is applied in the region of the surface of increased roughness by means of a thermal spraying process.

2. The method according to claim 1, maintaining the thickness of the layer formed with the flowable polymeric matrix material above the textile fibres of between 100 μm to 500 μm or the thickness of the layer formed with cured polymeric matrix material of between 100 μm and 500 μm above the textile fibres.

3. The method according to claim 1, using the pull-off fabric having a single-filament width of 10 μm to 50 μm, a fibre-bundle width of 100 μm to 1000 μm, the mesh structure or gauze having a mesh size of 1 μm to 50 μm and a thickness of 10 μm to 100 μm.

4. The method according to claim 1 consisting of the further step of applying a release agent to the surface of the mesh or the gauze before impregnating with the flowable polymeric matrix material.

5. The method according to claim 1, after the curing of the polymeric matrix material and before the formation of the coating, consisting of the further step of thermally treating with a temperature which is greater than the temperature at which the thermally sprayed material impinges on the surface of increased roughness, the temperature being at least 5% greater than the temperature at which the thermally sprayed material impinges on the surface of increased roughness.

6. The method according to claim 1, the thermal spraying process is atmospheric plasma spraying, arc wire spraying, high-speed flame spraying or flame spraying and the spraying material applied by the thermal spraying process is supplied to the operation, process-dependently as powder, wire, string, rod, solution or suspension.

7. The method according to claim 1 using a ply of a pull-off fabric, a mesh or a gauze with cut-outs, and forming locally defined regions with and without surface roughening, and only regions of increased surface roughness are provided with a coating by means of the thermal spraying process.

Description

DESCRIPTION OF THE DRAWING

(1) Below, an illustrative explanation will be given of a construction of the kind that can be used in the context of thermal spraying.

(2) In the drawing:

(3) FIG. 1 shows in schematic form one possible arrangement which can be employed in the formation of a coating by means of thermal spraying.

DETAILED DESCRIPTION OF THE INVENTION

(4) An explanation has been given here, as in the general part of the description, of how a region of a surface of an FRP component 1 was treated by peeling so as to achieve an increased surface roughness there.

(5) From the exit nozzle of a spray gun 4, by means of thermal spraying, a particle jet 3 is accelerated in the direction of the surface of increased roughness, so that this surface is coated with the particle material. The spray gun 4 is moved at a constant speed in the direction 6 of advance movement. As a result, the coating 2 is formed.

(6) During this procedure, the FRP component 1 is cooled by an arriving flow of CO.sub.2 or compressed air from the cooling nozzles 5 which are arranged on the spray gun 4, and so the composite component is not harmed, let alone damaged, by the elevated temperatures accompanying the thermal spraying.