Carbon/carbon composite material ultrahigh temperature oxidation resistant coating and preparation method thereof

A carbon composite material and anti-oxidation coating technology, which is applied in the field of ultra-high temperature anti-oxidation coating preparation, can solve the problem of low bonding strength, low viscosity of oxidation products, and inability to improve the ultra-high temperature oxidation resistance of ZrB2-SiC coating essentially and other problems, to achieve the effect of good ultra-high temperature mechanical properties and high coating bonding strength

Active Publication Date: 2012-06-27
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Abstract
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Problems solved by technology

Due to HfB 2 with ZrB 2 The properties of the oxidation products are similar, and the oxidation products have problems such as low viscosity, fast evaporation rate, and high oxygen diffusion coefficient, which lead to ZrB 2 - SiC bulk ceramic oxidation rate is too fast
The preparation of the above material system as a coating cannot substantially improve the ZrB 2 -Ultra high temperature oxidation resistance of SiC coating
[0005] When using the ceramic precursor impregnation cracking method described in Document 1 to prepare multi-component multi-phase ZrB containing anti-oxidation enhancement phase 2 -SiC coating, due to the cracking of the ceramic precursor generally occurs at 1100 ° C, ZrB 2 -The bonding strength between SiC and the anti-oxidation enhanced phase is low, and the anti-oxidation enhanced phase is easy to debond and fail in an ultra-high temperature environment
When using the vacuum plasma spraying method described in Document 2 to prepare multi-component multi-phase ZrB containing anti-oxidation enhancement phase 2 -SiC coating, due to the formation of coating, anti-oxidation enhancement phase, ZrB 2 , SiC is the solidified phase, the coating has a layered and porous structure, the coating has low bonding strength and low density, and cannot provide effective ultra-high temperature oxidation protection for C / C composites

Method used

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  • Carbon/carbon composite material ultrahigh temperature oxidation resistant coating and preparation method thereof
  • Carbon/carbon composite material ultrahigh temperature oxidation resistant coating and preparation method thereof

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Effect test

Embodiment 1

[0028] The carbon / carbon composite ultra-high temperature anti-oxidation coating of this embodiment is composed of the following components in volume percentage: ZrB 2 60%, SiC 15%, TaB 2 15%, Sc 2 o 3 10%.

[0029] The preparation method of the carbon / carbon composite ultra-high temperature anti-oxidation coating of this embodiment is:

[0030] Step 1. After polishing the carbon / carbon composite material, ultrasonically clean it in acetone, and then dry it in an oven;

[0031] Step 2, ZrB with a mass purity of 99.9% and an average particle size of 3 μm 2 Powder, SiC powder with a mass purity of 99.9% and an average particle size of 1 μm, TaB with a mass purity of 99.9% and an average particle size of 2 μm 2 Powder, and Sc with a mass purity of 99.6% and an average particle size of 1.5 μm 2 o 3 The powder is put into a ball mill tank according to the volume percentage, and the ethanol solution with a mass percentage of polyvinylpyrrolidone of 15% is used as a dispers...

Embodiment 2

[0036] The carbon / carbon composite ultra-high temperature anti-oxidation coating of this embodiment is composed of the following components in volume percentage: ZrB 2 50%, SiC 20%, TaB 2 18%, Sc 2 o 3 12%.

[0037] The preparation method of the carbon / carbon composite ultra-high temperature anti-oxidation coating of this embodiment is:

[0038] Step 1. After polishing the carbon / carbon composite material, ultrasonically clean it in acetone, and then dry it in an oven;

[0039] Step 2, ZrB with a mass purity of 99.9% and an average particle size of 1.5 μm 2 Powder, SiC powder with a mass purity of 99.9% and an average particle size of 0.5 μm, TaB with a mass purity of 99.9% and an average particle size of 1 μm 2 Powder, and Sc with a mass purity of 99.6% and an average particle size of 0.8 μm 2 o 3 Put the powder into a ball mill jar by volume percentage, use polyvinylpyrrolidone as a 5% ethanol solution as a dispersant, SiC balls as a grinding ball, and mix for 48 h...

Embodiment 3

[0044] The carbon / carbon composite ultra-high temperature anti-oxidation coating of this embodiment is composed of the following components in volume percentage: ZrB 2 40%, SiC 25%, TaB 2 20%, Sc 2 o 3 15%.

[0045] The preparation method of the carbon / carbon composite ultra-high temperature anti-oxidation coating of this embodiment is:

[0046] Step 1. After polishing the carbon / carbon composite material, ultrasonically clean it in acetone, and then dry it in an oven;

[0047] Step 2, ZrB with a mass purity of 99.9% and an average particle size of 0.5 μm 2 Powder, SiC powder with a mass purity of 99.9% and an average particle size of 0.1 μm, TaB with a mass purity of 99.9% and an average particle size of 0.1 μm 2 Powder, and Sc with a mass purity of 99.6% and an average particle size of 0.1 μm 2 o 3 The powder is put into a ball mill tank according to the volume percentage, the ethanol solution with a mass percentage of polyvinylpyrrolidone of 20% is used as a dispe...

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Abstract

The invention discloses a carbon / carbon composite material ultrahigh temperature oxidation resistant coating. The coating comprises the following components, by volume, 40-60% of ZrB2, 15-25% of SiC, 15-20% of TaB2 and 10-15% of Sc2O3. In addition, the invention also provides a preparation method of the coating. According to the invention, TaB2 and Sc2O3 are added to make the melting point of an external layer oxidation product borosilicate glass be risen, the viscosity of the borosilicate glass be risen, the evaporation rate of the borosilicate glass be reduced, the oxygen dispersion coefficient of the borosilicate glass be reduced, an internal layer oxidation product ZrO2 phase be stable, the melting point of ZrO2 be risen, and the oxygen diffusion coefficient of ZrO2 be reduced, so thecoating can satisfy requirements of the ultrahigh temperature oxidation resistance of a carbon / carbon composite material, the coating can be sintered without applying a pressure through adding TaB2 and Sc2O3, the coating has the advantages of high combination strength, compactness, and good ultrahigh temperature mechanical property, and the preparation process has no damages to matrixes.

Description

technical field [0001] The invention belongs to the technical field of preparation of ultra-high temperature anti-oxidation coatings, and in particular relates to an ultra-high temperature anti-oxidation coating of a carbon / carbon composite material and a preparation method thereof. Background technique [0002] Carbon / carbon composite material has the unique properties of low density, high specific strength, high specific modulus, low thermal expansion coefficient, thermal shock resistance and strength rises instead of falling with temperature, and is used as ultra-high temperature (>1800°C) structural composite material Has unique advantages. However, carbon / carbon composites are extremely susceptible to oxidation at high temperatures. Coating is an important way to improve the ultra-high temperature oxidation resistance of carbon / carbon composites. [0003] The currently researched carbon / carbon composite ultra-high temperature anti-oxidation coating is mainly ZrB 2...

Claims

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Application Information

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