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Method for preparing inoxidzable coating at high-temperature on carbon/carbon composite material surface

A carbon composite material and composite material technology are applied in the field of preparation of anti-oxidation coatings on the surface of carbon/carbon composite materials, and can solve the problems of complex coating preparation methods, limiting the actual protection ability of coatings, and long cycle times.

Inactive Publication Date: 2008-10-29
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation method of the coating is more complicated and the cycle is longer.
In addition, since the coating preparation temperature is as high as 2200 ℃ ~ 2400 ℃, when the coating is applied to specific and complex C / C workpieces, it is difficult to avoid the presence of micro-cracks in the coating, which limits the actual protection ability of the coating.

Method used

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  • Method for preparing inoxidzable coating at high-temperature on carbon/carbon composite material surface
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  • Method for preparing inoxidzable coating at high-temperature on carbon/carbon composite material surface

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Experimental program
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Effect test

Embodiment 1

[0020] Embodiment 1: Weigh respectively the Si powder of 19g, the C powder of 4g, the Al of 2g 2 o 3 powder, placed in an agate ball mill jar, adding distilled water as a ball milling agent, and performing ball milling and mixing on a planetary ball mill. Mixed powder: distilled water: agate ball=1:3:0.8, and the ratio is a mass ratio. After ball milling for 10 hours, the mixed solution was taken out and dried at 100° C., and the dried powder was ground and dispersed as embedding powder for later use. At the same time, the C / C composite material was polished successively with No. 400, No. 800, and No. 1000 sandpaper, and then washed with absolute ethanol in ultrasonic waves, and dried in an oven at 100 °C. The purity of Si powder is 99.5%, the particle size is 400 mesh, the purity of C powder is 99%, the particle size is 400 mesh, Al 2 o 3 The powder had a purity of 99.9% and a particle size of 300 mesh. See the attached table for the size and quantity of agate balls.

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Embodiment 2

[0027] Embodiment 2: Weigh respectively the Si powder of 20g, the C powder of 3.75g, the Al of 1.25g 2 o 3 powder, placed in an agate ball mill jar, adding distilled water as a ball milling agent, and performing ball milling and mixing on a planetary ball mill. Mixed powder: distilled water: agate ball=1:3:0.8, and the ratio is a mass ratio. After ball milling for 15 hours, the mixed solution was taken out and dried at 100° C., and the dried powder was ground and dispersed as embedding powder for later use. At the same time, the C / C composite material was polished successively with No. 400, No. 800, and No. 1000 sandpaper, and then washed with absolute ethanol in ultrasonic waves, and dried in an oven at 100 °C. The purity of Si powder is 99.5%, the particle size is 400 mesh, the purity of C powder is 99%, the particle size is 400 mesh, Al 2 o 3The powder had a purity of 99.9% and a particle size of 300 mesh. The size and quantity of agate balls are shown in the attached ...

Embodiment 3

[0032] Embodiment 3: Weigh respectively the Si powder that mass percent is 16.25g, the C powder of 5g, the Al of 3.75g 2 o 3 powder, placed in an agate ball mill jar, adding distilled water as a ball milling agent, and performing ball milling and mixing on a planetary ball mill. Mixed powder: distilled water: agate ball=1:3:0.8, and the ratio is a mass ratio. After ball milling for 10 hours, the mixed solution was taken out and dried at 100° C., and the dried powder was ground and dispersed as embedding powder for later use. At the same time, the C / C composite material was polished successively with No. 400, No. 800, and No. 1000 sandpaper, and then washed with absolute ethanol in ultrasonic waves, and dried in an oven at 100 °C. The purity of Si powder is 99.5%, the particle size is 400 mesh, the purity of C powder is 99%, the particle size is 400 mesh, Al 2 o 3 The powder had a purity of 99.9% and a particle size of 300 mesh. The size and quantity of agate balls are sho...

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Abstract

The invention provides a preparation method of a high temperature oxidation-resistant coating on the surface of a carbon / carbon composite material. The preparation method comprises placing Si powder, C powder, and Al2O3 into an agate ball milling tank, adding distilled water, mixing and ball milling, taking out the mixed solution, and drying to form inner layer embedded powder; placing the treated C / C composite material into the powder in a graphite crucible; placing into a vertical type vacuum furnace with graphite being the heating body for preparing an undercoat; mixing the Si powder, Mo powder, W powder and C powder with absolute ethanol and silica sol to obtain slurry; and uniformly brush coating surface of the SiC inner layer of the C / C composite material I with the slurry, drying, and placing into an alumina crucible for preparing a top coating. The antioxidant protective time of the C / C composite material is increased from 100 hours in prior art to 200-252 hours in 1500 DEG C air using high temperature oxidation resistance of MoSi2 and WSi2 via combination of the undercoat and the top coating.

Description

technical field [0001] The invention relates to a method for preparing an anti-oxidation coating on the surface of a carbon / carbon composite material. Background technique [0002] Preparation of anti-oxidation coating on the surface of carbon / carbon composites is an effective means to solve the problem of easy oxidation of carbon / carbon composites. [0003] Document 1 "Zhang Yulei, Li Hejun, Fu Qiangang. A Si-Mo oxidation protective coating for C / SiCcoated carbon / carbon composites. Carbon, 2007, 45(5): 1130-1133" discloses a slurry method respectively C / SiC / Si-Mo composite anti-oxidation coatings were prepared on the surface of C / C composites by two embedding methods. The coating is not only complicated to prepare, but also can only provide anti-oxidation protection for C / C composite materials for no more than 100 hours in air at 1500 °C. [0004] Document 2 "Multilayer coating with self-sealing properties for carbon-carbon composites, Federico Smeacetto, Monica Ferraris,...

Claims

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Application Information

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IPC IPC(8): C04B41/85
Inventor 李贺军仝珂付前刚史小红李克智
Owner NORTHWESTERN POLYTECHNICAL UNIV
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