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Method for preparing anti-oxidation multiple phase coating of carbon/carbon composite material surface

A technology of carbon composite materials and composite materials, which is applied in the field of preparation of multi-phase anti-oxidation coatings on the surface of carbon/carbon composite materials, which can solve the problems of high-temperature anti-oxidation temperature, poor thermal shock resistance and erosion resistance, and easy cracking of coatings and other problems, to achieve the effect of improving thermal shock resistance and solving the mismatch of thermal expansion coefficients

Inactive Publication Date: 2007-06-13
NORTHWESTERN POLYTECHNICAL UNIV
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  • Application Information

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Problems solved by technology

[0007] In order to overcome the shortcomings of the coatings prepared in the prior art, such as low high-temperature anti-oxidation temperature, easy cracking, poor thermal shock resistance and poor erosion resistance, the present invention provides a method for preparing an anti-oxidation multi-phase coating on the surface of carbon / carbon composite materials

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  • Method for preparing anti-oxidation multiple phase coating of carbon/carbon composite material surface

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Effect test

Embodiment 1

[0020] Embodiment 1: take by weight respectively the Si powder of 65%, the C powder of 13%, the Al of 10% 2 o 3 Powder, 12% β-SiC whiskers. Put the β-type SiC whiskers into a container filled with ethanol solution for ultrasonic dispersion treatment, and the dispersion time is 10 minutes. The weighed Si powder, C powder and Al 2 o 3 Pour the powder into the above container, and use a magnetic stirrer to stir and mix to prepare a slurry. The stirrer speed is 2.5 rpm, and the stirring time is 35 minutes. At the same time, the C / C composites were polished and polished with No. 400, No. 800 and No. 1000 sandpapers respectively, washed with absolute ethanol, and dried in an oven at 100°C for later use. The purity of Si powder is 99.5%, the particle size is 300 mesh, the purity of C powder is 99%, the particle size is 320 mesh, Al 2 o 3 The purity of the powder is 99.9%, the particle size is 320 mesh, MoSi 2 The purity of the powder is 99%, the particle size is 300 mesh, the ...

Embodiment 2

[0027]Embodiment 2: take by weight respectively the Si powder of 70%, the C powder of 10%, the Al of 5% 2 o 3 Powder, 15% β-SiC whiskers. Put the β-type SiC whiskers into a container filled with ethanol solution for ultrasonic dispersion treatment, and the dispersion time is 11 minutes. The weighed Si powder, C powder and Al 2 o 3 The powder was poured into the above-mentioned container, and a magnetic stirrer was used to stir and mix to prepare a slurry. The speed of the stirrer was 3 revolutions per second, and the stirring time was 33 minutes. At the same time, the C / C composites were polished and polished with No. 400, No. 800 and No. 1000 sandpapers respectively, washed with absolute ethanol, and dried in an oven at 100°C for later use. The purity of Si powder is 99.5%, the particle size is 300 mesh, the purity of C powder is 99%, the particle size is 320 mesh, Al 2 o 3 The purity of the powder is 99.9%, the particle size is 320 mesh, MoSi 2 The purity of the powde...

Embodiment 3

[0032] Embodiment 3: take by weight respectively the Si powder of 75%, the C powder of 15%, the Al of 5% 2 o 3 Powder, 5% β-SiC whiskers. Put the β-type SiC whiskers into a container filled with ethanol solution for ultrasonic dispersion treatment, and the dispersion time is 13 minutes. The weighed Si powder, C powder and Al 2 o 3 Pour the powder into the above container, and use a magnetic stirrer to stir and mix to prepare a slurry. The stirrer speed is 3.5 rpm, and the stirring time is 35 minutes. At the same time, the C / C composites were polished and polished with No. 400, No. 800 and No. 1000 sandpapers respectively, washed with absolute ethanol, and dried in an oven at 100°C for later use. The purity of Si powder is 99.5%, the particle size is 300 mesh, the purity of C powder is 99%, the particle size is 320 mesh, Al 2 o 3 The purity of the powder is 99.9%, the particle size is 320 mesh, MoSi 2 The purity of the powder is 99%, the particle size is 300 mesh, the di...

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Abstract

The present invention discloses the preparation process of antioxidant multiple phase coating on the surface of carbon / carbon composite material. On the surface of carbon / carbon composite material, one porous SiC whisker toughened SiC coating is first prepared with Si powder, C powder, Al2O3 powder and beta-SiC whiskcer as material and alcohol as dispersant, and through a slurry process. The carbon / carbon composite material with SiC whisker toughened SiC coating is coated in mixed powder of high purity Si powder, C powder and MoSi2 powder in certain weight proportion, and sintered in protecting atmosphere; and through serial diffusion reactions, the required coating is obtained. The present invention has the advantages of certain amount of free Si in the coating to result in high compactness, effective inhibition of crack expansion in the multiple phase MoSi2-SiC-Si coating, and raised antioxidant, heat shock resisting and eroslion resisting property.

Description

technical field [0001] The invention relates to a method for preparing an anti-oxidation multiphase coating on the surface of a carbon / carbon composite material. Background technique [0002] In order to solve the problem of high-temperature and long-life oxidation resistance of carbon / carbon composites, researchers have proposed different solutions. Preparation of anti-oxidation coating on the surface of carbon / carbon composites is an effective method to solve the problem of easy oxidation of C / C composites at high temperature. [0003] Document 1 "MoSi on the surface of carbon / carbon composites 2 -SiC multiphase ceramic coating and its anti-oxidation mechanism, Zeng Xierong, Li Hejun, Yang Zheng. Journal of the Chinese Society of Ceramics, 1999, 27(1): 8-15" introduced a method of preparing MoSi on the surface of carbon / carbon composite materials by embedding method. 2 -SiC dual-phase coating method, literature 2 "Carbon-carbon composite Si-MoSi 2 Oxidation resistance ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/50
Inventor 李贺军付前刚史小红李克智张守阳
Owner NORTHWESTERN POLYTECHNICAL UNIV
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