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Microwave preparation method of anti-oxidation coating made of carbon-based material

A carbon-based material, anti-oxidation technology, applied in chemical instruments and methods, anti-corrosion coatings, fibrous fillers, etc., can solve the problems of lack of product quality, complex equipment, high cost, and achieve reduced equipment complexity, reduced operating costs, The effect of preventing matrix oxidation

Inactive Publication Date: 2012-11-14
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, Chinese patent 200610041916.7 uses MoSi 2 -SiC-Si slurry method prepares a multi-layer structure, and obtains a good anti-oxidation effect through surface siliconization under high temperature conditions, but each coating treatment needs to be processed in a vacuum furnace, and the temperature is as high as 1500-2300 ° C. Due to the slow speed of siliconization, the reaction time is several hours, the cost is high, and the equipment is complicated
The US patent reports the SiC anti-oxidation coating technology prepared by CVD technology, which also has the problems of complex equipment and high operating costs, and is not suitable for the preparation of complex-shaped parts.
Summarize the main shortcomings of the existing anti-oxidation coating preparation technology of carbon-based composite materials represented by C / C composite materials: 1. The preparation process is complicated; 2. Using CVD, vacuum treatment furnace and other equipment, the operating cost is high The quality lacks stability 3. It is difficult to apply an anti-oxidation coating on the surface of some samples with complex shapes, which can no longer meet the needs of actual work

Method used

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  • Microwave preparation method of anti-oxidation coating made of carbon-based material
  • Microwave preparation method of anti-oxidation coating made of carbon-based material
  • Microwave preparation method of anti-oxidation coating made of carbon-based material

Examples

Experimental program
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Effect test

Embodiment 1

[0019] First prepare the slurry: weigh 27% Si powder, 25% C, and 33% SiO. 2 , 12% Al 2 O 3 Powder, 2% Al aluminum powder, add 1% hydroxyethyl cellulose thickener, use absolute ethanol as dispersant, put the weighed ingredients in a container for ultrasonic dispersion, no less than 10 minutes, and then use Silica sol is used as the binder. The amount of silica sol added is 5% of the above slurry. The slurry is adjusted by conventional paint stirring equipment, and the stirring time is 35min. At the same time, the surface pretreatment process of the substrate is: use carbon materials separately No. 600, No. 1500, and No. 2000 sandpapers were polished in sequence, washed with absolute ethanol, and placed in an oven at 100°C for later use. The slurry coating process is as follows: the slurry prepared by dipping and coating the processed base material is dried in an oven at 100°C. The coating sintering process is as follows: Put graphite powder in an alumina crucible, put the matrix...

Embodiment 2

[0021] First prepare the slurry: weigh 20% Si powder, 14% C, 45% SiO respectively 2 , 5% SiC powder, 10% Al 2 O 3 Powder, 5% Al aluminum powder, use anhydrous ethanol as a dispersant, add 1% soluble starch thickener, the amount of silica sol added is 3% of the above slurry, and the slurry is adjusted by conventional paint mixing equipment; The surface pretreatment process of C / C composite materials is as follows: the C / C composite material is polished with No. 600, No. 1500 and No. 2000 sandpaper in sequence, then washed with absolute ethanol, and placed in an oven at 100°C for use. The slurry coating process is as follows: the slurry prepared by dipping and coating the processed base material is dried in an oven at 100°C. The coating sintering process is as follows: Put graphite powder in an alumina crucible, put the matrix material coated with slurry in the crucible, and then cover it with graphite powder, put it in a 700W microwave oven, adjust the power of the microwave oven...

Embodiment 3

[0023] First prepare the slurry: weigh 12% Si powder, 20% C, and 43% SiO. 2 , 12% SiC powder, 5% Al 2 O 3 Powder, 8% Al aluminum powder, using absolute ethanol as a dispersant, the amount of silica sol added is 8% of the above slurry, and the slurry is adjusted by conventional paint mixing equipment; the surface pretreatment process of the substrate is: The / SiC composite material was polished with No. 600, No. 1500 and No. 2000 sandpapers in sequence, then washed with absolute ethanol, and placed in an oven at 100°C for use. The slurry coating process is as follows: the slurry prepared by dipping and coating the processed base material is dried in an oven at 100°C. The coating sintering process is as follows: Put graphite powder in an alumina crucible, put the matrix material coated with slurry in the crucible, and then cover it with graphite powder, put it in a 700W microwave oven, adjust the power of the microwave oven to 40%. Heat for 5 minutes, then adjust the microwave po...

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Abstract

The invention relates to a microwave preparation method of an anti-oxidation coating made of a carbon-based material, in particular to a substrate material which may be a carbon material, a C / C composite material or a C / SiC composite material. In the invention, slurry prepared by using Si compounds is coated on the carbon-based material, which is subjected to surface treatment, by a brush or immersion, then the carbon-based material is buried in graphite powder in a corundum crucible, the corundum crucible is placed in microwaves to be heated, the pre-heating, heating and temperature preservation are performed by stepwise regulating the power of a microwave oven, and thus, an anti-oxidation single-layer coating is obtained; on this basis, a composite coating of oxides, silicides and the like can be obtained. In the invention, microwaves act directly on the carbon-based material and the carbon-based material, after absorbing the microwaves, generate heat raises the temperature to a required temperature, so that the coating and a substrate are bonded and a protective coating with high protective performance is obtained; and as aluminum powder is added as a SiC sintering aid, the compaction of the SiC is promoted by the silicon aluminum alloy produced by the low-melting-point aluminum and part of molten silicon.

Description

Technical field [0001] The invention relates to a preparation method of a C-based material high-temperature anti-oxidation coating, in particular to the surface treatment of carbon materials, C / C composite materials and C / SiC composite materials as the substrate materials, belonging to the field of surface technology. Background technique [0002] C-based composite materials, such as C / C composite materials, refer to composite materials composed of carbon matrix and carbon fiber, which have excellent high specific strength, ablation resistance, thermal shock resistance, low creep and high temperature performance stability, etc. Features, has a wide range of applications in aerospace and military technology and other fields. However, due to the rapid oxidation of C / C composite materials above 500℃ in the air, which leads to devastating damage, its application scope is very limited. A lot of researches have been done on the anti-oxidation methods of C / C composite materials at high ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C3/06C09D5/08C04B41/85C04B41/50
Inventor 孔祥华沈奎段方苗刘虎王帅
Owner UNIV OF SCI & TECH BEIJING
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