High-temperature-resistant long-service-life composite coating on surface of carbon/carbon composite material and preparation method

A carbon composite material and composite coating technology, which is applied in the high temperature resistant and long life composite coating and preparation on the surface of carbon/carbon composite material, B2-SiC-Si/SiC-Si composite anti-oxidation coating and its preparation field. Solve the problems of glass layer cracking and peeling

Active Publication Date: 2021-09-14
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, amorphous SiO 2 Will rapidly crystallize at 1700°C, accompan

Method used

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  • High-temperature-resistant long-service-life composite coating on surface of carbon/carbon composite material and preparation method
  • High-temperature-resistant long-service-life composite coating on surface of carbon/carbon composite material and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Take a certain amount of phenolic resin in a beaker, add a certain amount of absolute ethanol therein, wherein the mass ratio of phenolic resin to absolute ethanol is 2:8, stir it after ultrasonic treatment to obtain the phenolic resin solution A;

[0027] (2) add SiC powder in phenolic resin solution A, get slurry B after stirring evenly, wherein the massfraction of SiC is 40wt%; In phenolic resin solution A, add (Hf 0.25 Ta 0.25 Zr 0.25 Ti 0.25 )B 2 and SiC powder, wherein the mass fraction of SiC is 10wt%, (Hf 0.25 Ta 0.25 Zr 0.25 Ti 0.25 )B 2 The mass fraction of is 30wt%, and after stirring uniformly, slurry C is obtained;

[0028] (3) Dip the C / C composite material into the slurry B for 3 seconds, take it out and dry it in an oven at 50°C for 30 minutes. After repeating this process 3 times, a SiC inner coating is obtained; The C / C composite material was dipped into the slurry C for 3s, and then dried in an oven at 50°C for 30min after taking it out....

Embodiment 2

[0032] (1) Take a certain amount of phenolic resin in a beaker, add a certain amount of dehydrated alcohol therein, wherein the mass ratio of phenolic resin and dehydrated alcohol is 1:9, stir it after ultrasonic treatment to obtain a phenolic resin solution A;

[0033] (2) add SiC powder in phenolic resin solution A, get slurry B after stirring evenly, wherein the massfraction of SiC is 35wt%; In phenolic resin solution A, add (Hf 0.25 Ta 0.25 Zr 0.25 Ti 0.25 )B 2 and SiC powder, wherein the mass fraction of SiC is 15wt%, (Hf 0.25 Ta 0.25 Zr 0.25 Ti 0.25 )B 2 The mass fraction of is 35wt%, after stirring uniformly, slurry C is obtained;

[0034] (3) Dip the C / C composite material into the slurry B for 4 seconds, take it out and dry it in an oven at 70°C for 15 minutes. After repeating this process 3 times, a SiC inner coating is obtained; The C / C composite material was dipped into the slurry C for 4s, and then dried in an oven at 70°C for 15min after taking it out. ...

Embodiment 3

[0038] (1) Take a certain amount of phenolic resin in a beaker, add a certain amount of absolute ethanol therein, wherein the mass ratio of phenolic resin to absolute ethanol is 2:8, stir it after ultrasonic treatment to obtain the phenolic resin solution A;

[0039] (2) add SiC powder in phenolic resin solution A, get slurry B after stirring evenly, wherein the massfraction of SiC is 30wt%; In phenolic resin solution A, add (Hf 0.25 Ta 0.25 Zr 0.25 Ti 0.25 )B 2 and SiC powder, wherein the mass fraction of SiC is 20wt%, (Hf 0.25 Ta 0.25 Zr 0.25 Ti 0.25 )B 2 The mass fraction of is 40wt%, after stirring uniformly, slurry C is obtained;

[0040] (3) Dip the C / C composite material into the slurry B for 5 seconds, take it out and dry it in an oven at 80°C for 10 minutes. After repeating this process 3 times, a SiC inner coating is obtained; The C / C composite material was dipped into the slurry C for 5s, and then dried in an oven at 80°C for 10min after taking it out. Thi...

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Abstract

The invention relates to a high-temperature-resistant long-service-life composite coating on the surface of a carbon/carbon composite material and a preparation method. The (Hf0.25Ta0.25 Zr0.25Ti0.25) B2-SiC-Si/SiC-Si composite anti-oxidation coating is prepared by combining slurry dip-coating with a gas-phase siliconizing technology, a SiC-Si inner coating is used for relieving thermal mismatch between the coating and a base body, an outer layer is (Hf0.25Ta0.25Zr0.25Ti0.25) B2-SiC-Si, high-entropy ceramic is introduced into the outer coating, and a multi-element metal oxide is generated after oxidation, so that the stability of SiO2 at a high temperature is improved, and finally, long-time effective protection of the coating on the C/C composite material at the high temperature is realized. The weight of a (Hf0.25Ta0.25Zr0.25Ti0.25)B2-SiC-Si/SiC-Si composite anti-oxidation coating sample prepared by the preparation method disclosed by the invention is increased by 1.12% after the sample is oxidized for 2000h at the temperature of 1500 DEG C, and the weight of the coating sample is increased by 1.05% after the sample is oxidized for 500h at the temperature of 1700 DEG C.

Description

technical field [0001] The invention belongs to the technical field of anti-oxidation coating preparation, and relates to a carbon / carbon composite material surface high temperature resistant long-life composite coating and a preparation method thereof, in particular to a (Hf 0.25 Ta 0.25 Zr 0.25 Ti 0.25 )B 2 -SiC-Si / SiC-Si composite anti-oxidation coating and preparation method thereof. Background technique [0002] Carbon / carbon (C / C) composites have excellent properties such as high specific strength, low thermal expansion coefficient, and high temperature resistance, especially the ability to maintain high strength at ultra-high temperatures, making them widely used in high-temperature aerospace fields Structural components. However, C / C composites are easily oxidized in an aerobic environment exceeding 370°C, which will lead to a rapid decline in their mechanical properties and various physical and chemical properties. Stable and durable anti-oxidation protection h...

Claims

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Application Information

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IPC IPC(8): C04B41/87C04B35/565C04B35/515C04B35/58C04B35/622
CPCC04B41/5059C04B41/5053C04B41/5062C04B41/87C04B41/009C04B35/565C04B35/515C04B35/5805C04B35/62222C04B2235/428C04B2235/3813C04B35/83
Inventor 付前刚周磊李贺军张佳平丁伍庆侯佳琪
Owner NORTHWESTERN POLYTECHNICAL UNIV
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