A local defect whisker or flake reinforcement repair method and repair coating of carbon/carbon composite coating

A carbon composite material, local defect technology, applied in the repair coating of reinforced composite structure and its related fields, can solve the problems of inconvenient on-site operation, inability to repair in layers, difference in coating performance, etc., to improve consistency, reduce Equipment dependence, simple process effect

Active Publication Date: 2022-07-12
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the above-mentioned deficiencies, the object of the present invention is to provide a kind of operation simple, fast, the carbon / carbon composite material coating that can carry out on-site local defect whisker reinforcement or flake repair method and repair coating, to solve the problems in the prior art It cannot be repaired according to layers, the performance of the repaired coating is different from that of other parts of the coating, and it is not convenient for on-site operation and other problems

Method used

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  • A local defect whisker or flake reinforcement repair method and repair coating of carbon/carbon composite coating
  • A local defect whisker or flake reinforcement repair method and repair coating of carbon/carbon composite coating
  • A local defect whisker or flake reinforcement repair method and repair coating of carbon/carbon composite coating

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specific Embodiment 1

[0048] The method for repairing local defect whiskers or flakes of carbon / carbon composite material coatings provided by the present invention comprises the following steps:

[0049] (1) First, clean up the local defects (natural damage or man-made damage) of the carbon / carbon composite coating, such as figure 1 As shown in (a), the diameter of the surface depression at the damaged part is about 2.5mm. Use 400-grit sandpaper to polish the peeled surface of the coating, then use ethanol to clean the peeled surface of the coating, and finally use a handheld heating device to bake at 80 °C. Dry;

[0050] (2) Mix 300 mesh silicon powder and liquid polycarbosilane in a mass ratio of 4:5, and then magnetically stir evenly to obtain the coating slurry of the inner coating, and then use the brushing method to brush the slurry on the surface where the coating has fallen off. , using hand-held heating equipment to cure at 250 ℃ for 20min, to obtain the inner coating transition layer su...

specific Embodiment 2

[0055] The method for repairing local defect whiskers or sheet-like reinforcement of the carbon / carbon composite material coating provided in the embodiment of the present invention and the repairing coating are basically the same as those in Embodiment 1, and the differences are:

[0056] (1) First, use 400-grit sandpaper to polish the surface of the local defect (damage) of the carbon / carbon composite coating, and then use ethanol to clean the surface of the coating. Finally, use a handheld heating device at 80 ℃ drying;

[0057] (2) Mix 300 mesh silicon powder and liquid polycarbosilane in a mass ratio of 4:6, stir magnetically evenly to obtain the coating slurry of the inner coating, and then apply the slurry to the surface where the coating falls off by brushing. , using a hand-held heating device to cure at 250 ° C for 20 min to obtain an inner coating;

[0058] (3) The drying and curing transition layer is subjected to low temperature plasma treatment for 4 minutes to im...

specific Embodiment 3

[0063] The local defect whisker or sheet-like reinforcement repair method and repair coating of the carbon / carbon composite material coating provided in the embodiment of the present invention are basically the same as those in Embodiments 1 and 2, and the differences are:

[0064] (1) First, use 400-grit sandpaper to polish the surface of the local defect (damage) of the carbon / carbon composite coating, and then use distilled water to clean the surface of the coating. Finally, use a handheld heating device at 80 ℃ drying;

[0065] (2) Mix 300 mesh silicon powder and liquid polycarbosilane in a mass ratio of 4:7, stir magnetically evenly to obtain the coating slurry of the inner coating, and then apply the slurry to the surface where the coating falls off by brushing. , using a hand-held heating device to cure at 250 ° C for 20 min to obtain an inner coating;

[0066] (3) The drying and curing transition layer is subjected to low temperature plasma treatment for 5 minutes to ...

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Abstract

The invention discloses a method for repairing local defect whiskers or flakes of carbon / carbon composite material coating. It is covered on the surface where the coating has fallen off, dried and cured, and the inner coating transition layer is obtained after low-temperature plasma treatment; then, with Na 2 SiO 3 ·9H 2 The mixed solution of O and silica sol is used as a binder, and SiC and Al are added. 2 O 3 Submicron powder and one-dimensional structure SiC, ZrB 2 , Zr 0.8 Ti 0.2 B 2 or 2D structured TiB 2 The mixed powder is coated on the surface of the transition layer, dried and then cured by baking to form an outer protective layer with a whisker reinforced composite structure. Repair of local defects in composite coatings. The invention also discloses the repair coating obtained by the method. The invention improves the high temperature oxidation resistance and ablation resistance of the repair coating through layered repair, and improves the consistency of the repair coating part and the coating performance of other parts.

Description

technical field [0001] The invention relates to a repair coating of a whisker or a sheet-like reinforced composite structure and a method for repairing a carbon / carbon composite material coating, belonging to the technical field of defect repairing of an antioxidative coating on the surface of a carbon / carbon composite material, in particular On the surface of the carbon / carbon composite material where the anti-oxidation coating is peeled off, a self-made organic-inorganic composite inner coating is used for transition, and then a one-dimensional or two-dimensional structure boride is introduced into the outer protective layer to design the microstructure, and then make up for the coating. Defects improve high temperature oxidation and ablation resistance of carbon / carbon composites. Background technique [0002] Carbon / carbon composite material is a new type of composite material composed of carbon fiber and carbon matrix. Because of its high strength, high specific modulu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/89
CPCC04B41/52C04B41/89C04B41/009C04B35/83C04B41/4983C04B41/4535C04B41/4572C04B41/0072C04B41/5089C04B41/5024C04B41/507C04B41/5059C04B41/5031
Inventor 甄强张通
Owner SHANGHAI UNIV
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