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

A carbon-based material and anti-oxidation technology, which is applied in the field of preparation of high-temperature anti-oxidation coatings for C-based materials, can solve problems such as lack of product quality, complex equipment, and high cost, and achieve reduced equipment complexity, reduced operating costs, and prevention of substrate The effect of oxidation

Inactive Publication Date: 2010-08-04
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 c

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

Example Embodiment

[0018] Example 1

[0019] First prepare the slurry: Weigh 27% Si powder, 25% C, 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 the 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, and the slurry is adjusted by conventional paint stirring equipment, and the stirring time is 35 minutes. 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 and washed with absolute ethanol, and placed in an oven at 100°C for use. The slurry coating process is: the slurry prepared by dipping and coating the processed substrate 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 mat...

Example Embodiment

[0020] Example 2

[0021] First prepare the slurry: weigh 20% Si powder, 14% C, 45% SiO 2 , 5% SiC powder, 10% Al 2 O 3 Powder, 5% Al aluminum powder, use absolute ethanol as dispersant, add 1% soluble starch thickener, add silica sol to 3% of the above slurry, and adjust it to slurry through conventional paint mixing equipment; The surface pretreatment process of C / C composite materials is as follows: Grind and polish the C / C composite material with No. 600, No. 1500 and No. 2000 sandpaper in sequence, then wash it with absolute ethanol, and place it in an oven at 100°C for use. The slurry coating process is: the slurry prepared by dipping and coating the processed substrate 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 completely, put it into a 700W microwave oven, adjust the power of the microwave o...

Example Embodiment

[0022] Example 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, use absolute ethanol as a dispersant, and the amount of silica sol added is 8% of the above slurry, which is adjusted into slurry by conventional paint stirring 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, washed with absolute ethanol, and placed in an oven at 100°C for use. The slurry coating process is: the slurry prepared by dipping and coating the processed substrate 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 completely, put it into a 700W microwave oven, adjust the power of the microwave oven to 40%. Heat for 5 minutes, ...

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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 a carbon material, a C / C composite material and a C / SiC composite material as a base material, and belongs to the surface technology field. 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. It 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 °C in the air, resulting in devastating damage, its application range is very limited. A lot of research has been done on the anti-oxidation methods of C / C composite materials at high temperature...

Claims

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Application Information

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IPC IPC(8): C04B41/85C04B41/50
Inventor 孔祥华沈奎段方苗刘虎王帅
Owner UNIV OF SCI & TECH BEIJING
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