Carbon/carbon composite ultrahigh temperature anti-oxidation coating and preparation process thereof

A carbon composite material and anti-oxidation coating technology, applied in the field of anti-oxidation inorganic materials, can solve the problems of pores in the coating, difficulty in preparing stoichiometric carbide phases, and poor ultra-high temperature oxidation resistance of multi-layer coatings, etc., to achieve High bonding strength, excellent ultra-high temperature oxidation resistance, and the effect of improving ultra-high temperature oxidation resistance

Active Publication Date: 2012-09-19
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method does not heat the substrate so that the prepared coating has a columnar grain structure. The columnar grains are recrystallized and densified at ultra-high temperatures, resulting in pores in the coating. When mixed with other phases, it is difficult to prepare carbides with a stoichiometric ratio. Mutually
Therefore, the ultra-high temperature oxidation resistance of the multi-component coating prepared by this method is poor

Method used

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  • Carbon/carbon composite ultrahigh temperature anti-oxidation coating and preparation process thereof
  • Carbon/carbon composite ultrahigh temperature anti-oxidation coating and preparation process thereof
  • Carbon/carbon composite ultrahigh temperature anti-oxidation coating and preparation process thereof

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Embodiment 1

[0034] The carbon / carbon composite ultra-high temperature anti-oxidation coating of this embodiment is composed of the following components in volume percentage: ZrB 2 70%, HfC 5%, SiC 10%, TiB 2 7%, Sc 2 o 3 8%.

[0035] The preparation method of the present embodiment is as follows:

[0036] Step 1. After polishing the carbon / carbon composite material with No. 400, No. 600, No. 800 and No. 1200 water-grinding sandpaper in sequence, ultrasonically clean it in absolute ethanol, and then put it into an oven for drying;

[0037] Step two, ZrB 2 Powder, HfC powder, SiC powder, TiB 2 Powder, Sc 2 o 3 After the powder is mixed by volume percentage, it is put into a ball mill jar with the polyvinylpyrrolidone-ethanol solution in a mass ratio of 1:2, and ball milled for 48 hours to obtain a slurry; the mass fraction of polyvinylpyrrolidone in the polyvinylpyrrolidone-ethanol solution is 20%; the average particle size of each powder in the above is: ZrB 2 2μm, HfC 2μm, Si...

Embodiment 2

[0043] The carbon / carbon composite ultra-high temperature anti-oxidation coating of this embodiment is composed of the following components in volume percentage: ZrB 2 67%, HfC 6%, SiC 11%, TiB 2 8%, Sc 2 o 3 8%.

[0044] The preparation method of the present embodiment is as follows:

[0045] Step 1. After polishing the carbon / carbon composite material with No. 400, No. 600, No. 800 and No. 1200 water-grinding sandpaper in sequence, ultrasonically clean it in acetone, and then put it in an oven to dry;

[0046] Step two, ZrB 2 Powder, HfC powder, SiC powder, TiB 2 Powder, Sc 2 o 3 After the powder is mixed according to the volume percentage, it is put into a ball mill jar for 64 hours with the polyvinylpyrrolidone-ethanol solution at a mass ratio of 1:5 to obtain a slurry; the mass fraction of polyvinylpyrrolidone in the polyvinylpyrrolidone-ethanol solution is 24 %; the average particle size of each powder is: ZrB 2 1μm, HfC 1μm, SiC 0.05μm, TiB 2 1 μm, Sc 2 ...

Embodiment 3

[0051] The carbon / carbon composite ultra-high temperature anti-oxidation coating of this embodiment is composed of the following components in volume percentage: ZrB 2 63%, HfC 7%, SiC 12%, TiB 2 9%, Sc 2 o 3 9%.

[0052] The preparation method of the present embodiment is as follows:

[0053] Step 1. After polishing the carbon / carbon composite material with No. 400, No. 600, No. 800 and No. 1200 water abrasive paper in sequence, ultrasonically clean it in deionized water, and then put it in an oven for drying;

[0054] Step two, ZrB 2 Powder, HfC powder, SiC powder, TiB 2 Powder, Sc 2 o 3 After the powder is mixed by volume percentage, it is put into a ball mill jar with the polyvinylpyrrolidone-ethanol solution at a mass ratio of 1:3, and ball milled for 48 hours to obtain a slurry; the mass fraction of polyvinylpyrrolidone in the polyvinylpyrrolidone-ethanol solution is 20%; the average particle size of each powder is: ZrB 2 2μm, HfC 2μm, SiC 0.5μm, TiB 2 2μm,...

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Abstract

The invention provides a carbon/carbon composite ultrahigh temperature anti-oxidation coating which is composed of ZrB2, HfC, SiC, TiB2 and Sc2O3 in a certain volume percentage. In addition, the invention also provides a preparation process of the carbon/carbon composite ultrahigh temperature anti-oxidation coating. The process comprises the steps of 1, conducting grinding, polishing, washing and drying on a carbon/carbon composite; 2, conducting ball milling on the ZrB2, the HfC, the SiC, the TiB2, the Sc2O3 and an organic solvent to obtain slurry; 3, coating the slurry on the surface of the carbon/carbon composite to obtain a slurry coating; and 4, sintering the carbon/carbon composite with the slurry coating on the surface by an electron beam, and obtaining the carbon/carbon composite ZrB2-HfC-SiC-TiB2-Sc2O3 coating. The coating prepared according to the process is compact, uniform, good in mechanical property, high in binding strength with a carbon/carbon composite substrate and capable of effectively improving the ultrahigh temperature anti-oxidation performance of the carbon/carbon composite.

Description

technical field [0001] The invention belongs to the technical field of oxidation-resistant inorganic materials, and in particular relates to a carbon / carbon composite material ultra-high temperature oxidation-resistant coating and a preparation method thereof. Background technique [0002] Carbon / carbon composite materials have high specific strength, high specific modulus, low density, low thermal expansion coefficient, thermal shock resistance, and unique properties that the mechanical strength does not decrease but increases with the increase of temperature. Materials that maintain high mechanical properties under ultra-high temperature conditions from ℃ to 2500 ℃. However, although carbon / carbon composites have many excellent properties under ultra-high temperature conditions, they are prone to oxidation reactions in an aerobic environment with temperatures higher than 400 °C, resulting in a decline in the overall performance of carbon / carbon composites. [0003] Ultra-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/85
Inventor 华云峰杜继红姬寿长李争显王宝云王彦峰
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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