Local coating defect repairing method for carbon/carbon composite material

A carbon composite material and defect repair technology, which is applied in the field of carbon/carbon composite material local coating defect repair, can solve problems such as unknown technical details, achieve good bonding performance, ensure long-term serviceability and reusability the effect of increasing thickness and densification

Active Publication Date: 2014-02-26
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are few studies on coating repair, and the main research focuses on the repair technology of the anti-oxidation coating of the space shuttle in the United States, but the technical details are unknown

Method used

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  • Local coating defect repairing method for carbon/carbon composite material
  • Local coating defect repairing method for carbon/carbon composite material
  • Local coating defect repairing method for carbon/carbon composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Such as Figure 1a Shown is a schematic diagram of a carbon / carbon composite material with coating defects in this example; where: 2 is a void, and 4 is a crack. In this embodiment, the size of the cavity 2 is Ф2 mm, and the size of the crack 4 is: width 2 mm, length 4 mm.

[0043] (1) Prepare coating repair agent:

[0044] Phenolic resin is used as the carrier of the repair material, and three ceramic powders, silicon nitride powder (300 mesh), silicon powder (300 mesh) and aluminum oxide powder (300 mesh), are used as the active ingredients of the repair material, of which silicon nitride Powder, silicon powder and aluminum oxide powder are uniformly mixed at a mass ratio of 1:1.75:0.5.

[0045] Fully mix the phenolic resin and mixed ceramic powder with a mass ratio of 1:1.5, and add ethanol as a dispersant to form a paste coating repair material; the mass ratio of phenolic resin, ceramic powder and ethanol is 1: 1.5:0.5.

[0046] (2) Prepare 12% nitric acid with d...

Embodiment 2

[0051] Such as Figure 2a Shown is a schematic diagram of the carbon / carbon composite material with coating defects in the example; where: 1 is a void, and 3 is a crack. In this embodiment, the size of the cavity 1 is Ф8 mm, and the size of the crack 3 is: width 6 mm, length 10 mm.

[0052] (1) Prepare coating repair agent:

[0053] Silicone resin is used as the carrier of the repair material, and three ceramic powders, silicon nitride powder (250 mesh), silicon powder (250 mesh) and aluminum oxide powder (250 mesh), are used as the active ingredients of the repair material. The silicon powder body, silicon powder and aluminum oxide powder are uniformly mixed at a mass ratio of 1:1.5:0.5.

[0054] Fully mix the silicone resin and mixed ceramic powder with a mass ratio of 1:2, and add ethanol as a dispersant to form a paste coating repair material; the mass ratio of silicone resin, ceramic powder and ethanol is 1:2:0.8.

[0055] (2) Prepare 12% nitric acid with deionized wa...

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Abstract

The invention relates to a local coating defect repairing method for a carbon/carbon composite material. A coating repairing agent prepared from a thermosetting resin and an inorganic filling material is coated on a coating defect position. A coating crack defect is repaired by crack/hole filling and reinforcement repair and coating extension, and therefore the surface of the defect is coated with the repairing agent and the repairing agent permeates into the defect interior, thus forming a continuous layer and preventing carbon atoms from oxidation reaction with oxygen atoms. Then a drying and curing process is performed in an air dry oven or a ventilating environment. Finally, the thickness and the compactness of the repairing agent are increased through a vacuum impregnation and drying method. The repairing method is simple, convenient and prone to achievement. The repaired carbon/carbon composite material has good performances and high quality. The local defect area of the antioxidant carbon/carbon composite material is effectively protected from being oxidized and ablated in an oxidation environment with a temperature lower than 1200 DEG C, thus achieving long-time using and repeated using of a high-performance antioxidant carbon/carbon composite material coating.

Description

technical field [0001] The invention relates to a method for repairing partial coating defects of a carbon / carbon composite material, belonging to the field of inorganic functional coating materials. Background technique [0002] Due to its own characteristics, carbon / carbon composite materials undergo oxidation reactions at about 400°C under oxygen conditions, so they need to be protected by an anti-oxidation coating. , assembly and transportation, various local coating defects such as nicks, scratches, improper drilling, excessive tightening torque and impact damage will inevitably occur during this process. These defects become oxidation reaction activation points, providing channels for the rapid diffusion of oxygen, and the oxidation reaction occurs under the catalysis of impurity particles, causing oxidation-resistant carbon / carbon composites to lose weight by oxidation. At present, there are few studies on coating repair, and the main research focuses on the repair t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/81
Inventor 李钰梅李同起张中伟吴宁宁刘风亮
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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