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A carbonaceous material wide temperature range anti-oxidation repair coating and its repair and preparation method

A carbonaceous material and wide temperature range technology, which is applied in the field of carbonaceous material wide temperature range anti-oxidation repair coating and repair, can solve the problems of poor high temperature stability of the repair coating and small applicable temperature range, and achieve anti-oxidation protection , Stable high temperature oxidation resistance, strong bonding effect

Active Publication Date: 2018-12-21
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the repair method of the coating is not yet mature, the high temperature stability of the repair coating is poor, and the applicable temperature range is small. It is still necessary to improve the feasibility of the repair process, improve the reliability of the repair coating, and expand the repair coating. layer applicability

Method used

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  • A carbonaceous material wide temperature range anti-oxidation repair coating and its repair and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] For local coating defects such as blind holes, deep pits, and grooves where the depth of the defect is greater than 1mm, a putty-type repairing material with high solid content and high viscosity is prepared. The following material ratio is selected: phenolic resin 20%, silicon 50%, boron carbide 5%, silicon carbide 20%, absolute ethanol 5%. After the above materials are fully dispersed and mixed, a repair compound is formed. Apply the repair material to the area to be repaired by scraping to fill the surface of the carbonaceous material.

[0060] Then, further brush the surface of the filled area with a less viscous slurry. The following material ratio is selected: 30% of silica sol, 25% of silicon, 20% of boron carbide, 5% of diboron trioxide, and 20% of absolute ethanol. After the above materials are fully dispersed and mixed, a repair compound is formed. Apply the repair compound to the area to be repaired by brushing or spraying so that the repair coating is flu...

Embodiment 2

[0066] For local coating defects such as blind holes, deep pits, and grooves where the depth of the defect is greater than 1mm, a putty-type repairing material with high solid content and high viscosity is prepared. The following material ratio is selected: 35% of silicone resin, 35% of silicon, 10% of boron carbide, 10% of silicon carbide, and 10% of absolute ethanol. After the above materials are fully dispersed and mixed, a repair compound is formed. Apply the repair material to the area to be repaired by scraping, and fill up the blind holes, deep pits and grooves.

[0067] Then, further brush the surface of the filled area with a less viscous slurry. The following material ratio is selected: 20% of silicone resin, 30% of silicon, 5% of boron carbide, 5% of silicon carbide, 5% of diboron trioxide, and 35% of absolute ethanol. After the above materials are fully dispersed and mixed, a repair compound is formed. Apply the repair compound to the area to be repaired by brus...

Embodiment 3

[0073] For local coating defects such as blind holes, deep pits, and grooves where the depth of the defect is greater than 1mm, a putty-type repairing material with high solid content and high viscosity is prepared. The following material ratio is selected: 25% of silicone resin, 40% of silicon, 5% of boron carbide, 15% of silicon carbide, and 15% of absolute ethanol. After the above materials are fully dispersed and mixed, a repair compound is formed. Use the method of scraping and brushing to apply the repair material to the area to be repaired, and fill the blind holes, deep pits and grooves.

[0074] After the repair coating is applied, it should be surface-dry at room temperature for 1 hour, and then use a quartz lamp to heat and cure the repaired area. The following curing process system can be used:

[0075] Starting from room temperature, the temperature is raised freely to 100±10°C (2±0.25 hours of heat preservation), and then the temperature is raised freely twice i...

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Abstract

The invention relates to a carbonaceous material wide-temperature-range antioxidant repair coating and repairing and preparing methods thereof. Silica sol, phenolic resin or silicon resin serves as a binder of the repair coating, silicon, carbide and oxide serve as high-temperature-resisting filler, and the materials are fully dispersed and mixed to prepare a boron-silicon repair material. By the adoption of repair material coating and low-temperature curing technologies, in-situ low-temperature quick repair of an antioxidant coating defect area can be achieved. The process is simple, period is short, coating repair can be achieved at low temperature, and high-temperature thermal treatment is not needed. A formed repair layer can be well bonded with a base material and an original coating, and antioxidant function can be realized within a wide temperature range (500-1600 DEG C).

Description

technical field [0001] The invention relates to a repair coating and a repair method, in particular to a carbonaceous material wide temperature range anti-oxidation repair coating and a repair method. Background technique [0002] Carbonaceous materials represented by carbon / carbon composite materials and carbon / silicon carbide composite materials have been widely used in many fields such as aviation and aerospace due to their excellent high-temperature mechanical properties and thermophysical properties. [0003] The preparation of anti-oxidation coatings on the surface of carbonaceous materials is an effective way to realize their long-term use in high-temperature aerobic environments. Coating preparation methods are usually reaction sintering method, chemical vapor deposition method, plasma spraying method and so on. Due to the softness of the carbonaceous material substrate, the surface coating of the component is more likely to be damaged and cause coating defects duri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/89
CPCC04B41/009C04B41/52C04B41/89C04B41/4823C04B41/5059C04B41/5058C04B41/5096C04B41/463C04B41/4576C04B41/4955C04B41/522C04B41/5089C04B41/5006C04B41/4572C04B35/83
Inventor 李同起焦星剑李钰梅张中伟冯志海
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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