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A 1500~1700°C anti-oxidation coating on the surface of a carbon/carbon composite material and its preparation method

A technology of carbon composite materials and anti-oxidation coatings, which is applied in the field of anti-oxidation coatings and preparations on the surface of carbon/carbon composite materials at 1500-1700 °C, can solve the problems of thermal expansion coefficient mismatch between coatings and coatings, and achieve improved anti-oxidation Oxidation performance, improved bonding and infiltration, and easy operation

Active Publication Date: 2021-03-23
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to avoid the deficiencies of the prior art, the present invention proposes a carbon / carbon composite surface 1500-1700 ℃ anti-oxidation coating and its preparation method to solve the problem of thermal expansion coefficient mismatch between coatings and improve The bonding and infiltration between coatings can reduce the problem of peeling off during the oxidation process when the thermal expansion coefficient of the coating is too high, increase the content of ultra-high temperature ceramic hafnium boride in the coating, and improve the resistance of silicon-based ceramic coatings at 1700 ° C. Antioxidant properties, etc.

Method used

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  • A 1500~1700°C anti-oxidation coating on the surface of a carbon/carbon composite material and its preparation method
  • A 1500~1700°C anti-oxidation coating on the surface of a carbon/carbon composite material and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0026] 1) After grinding and polishing the C / C composite material with a size of 8mm×8mm×8mm with No. 100, No. 500 and No. 1000 sandpapers in turn, ultrasonically cleaned with absolute ethanol for 30 minutes, and the ultrasonic power was set to 90W. Dry in the oven for later use.

[0027] 2) Weigh the Si powder with a mass fraction of 70-85% and the C powder with a mass fraction of 15-30% respectively. Then put it in a ball mill and mix it for 2 to 4 hours and stir it evenly for later use.

[0028] 3) The mass fraction of 5 to 15% of HfO 2Powder, 70~85% Si powder, 2~5% B 4 C powder and 15-30% carbon powder were weighed separately, and then placed in a ball mill to be ball-milled and mixed for 2-4 hours and stirred evenly as the first layer of raw material powder for the gradient coating on the surface of the SiC-coated C / C composite material for use; the mass fraction 15~30% HfO 2 powder, 50~70% Si powder, 3~10% B 4 C powder and 10-20% carbon powder were weighed separatel...

Embodiment 2

[0035] 1) After grinding and polishing the C / C composite material with a size of 8mm×8mm×8mm with No. 100, No. 500 and No. 1000 sandpapers in turn, ultrasonically cleaned with absolute ethanol for 30 minutes, and the ultrasonic power was set to 90W. Dry in the oven for later use.

[0036] 2) Weigh the Si powder with a mass fraction of 70-85% and the C powder with a mass fraction of 15-30% respectively. Then put it in a ball mill and mix it for 2 to 4 hours and stir it evenly for later use.

[0037] 3) The mass fraction of 5 to 15% of HfO 2 Powder, 70~85% Si powder, 2~5% B 4 C powder and 15-30% carbon powder were weighed separately, and then placed in a ball mill to be ball-milled and mixed for 2-4 hours and stirred evenly as the first layer of raw material powder for the gradient coating on the surface of the SiC-coated C / C composite material for use; the mass fraction 15~30% HfO 2 powder, 50~70% Si powder, 3~10% B 4 C powder and 10-20% carbon powder were weighed separate...

Embodiment 3

[0044] 1) After grinding and polishing the C / C composite material with a size of 8mm×8mm×8mm with No. 100, No. 500 and No. 1000 sandpapers in turn, ultrasonically cleaned with absolute ethanol for 30 minutes, and the ultrasonic power was set to 90W. Dry in the oven for later use.

[0045] 2) Weigh the Si powder with a mass fraction of 70-85% and the C powder with a mass fraction of 15-30% respectively. Then put it in a ball mill and mix it for 2 to 4 hours and stir it evenly for later use.

[0046] 3) The mass fraction of 5 to 15% of HfO 2 Powder, 70~85% Si powder, 2~5% B 4 C powder and 15-30% carbon powder were weighed separately, and then placed in a ball mill to be ball-milled and mixed for 2-4 hours and stirred evenly as the first layer of raw material powder for the gradient coating on the surface of the SiC-coated C / C composite material for use; the mass fraction 15~30% HfO 2 powder, 50~70% Si powder, 3~10% B 4 C powder and 10-20% carbon powder were weighed separate...

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Abstract

The invention relates to a 1500-1700 DEG C carbon / carbon composite material surface oxidation-resistant coating and a preparation method. A gradient hafnium boride modified silicon carbide outer coating is prepared by an in-situ reaction method, and the content of hafnium boride is sequentially increased from inside to outside. On one hand, the method solves the problems of mismatching of a thermal expansion coefficient between coatings and peeling of the coatings caused by excessive thermal expansion coefficient in the oxidation process, and binding and infiltration between the coatings are improved. On the other hand, the content of HfB2 in the coating is greatly increased by the gradient hafnium boride modified silicon carbide outer coating prepared by the in-situ reaction method, and the oxidation resistance of a silicon ceramic coating is effectively improved. Compared with other methods for preparing the oxidation-resistant coating such as a slurry method and a plasma spraying method, the preparation method is simple to operate, cost is saved, and the prepared coating and a substrate have a good binding force.

Description

technical field [0001] The invention belongs to a carbon / carbon composite material surface coating and a preparation method, and relates to a carbon / carbon composite material surface 1500-1700 ℃ anti-oxidation coating and a preparation method. Background technique [0002] C / C composite materials have excellent properties such as small thermal expansion coefficient, high specific modulus, high specific strength, high temperature resistance, thermal shock resistance, and easy processing and manufacturing. However, these excellent properties can only be achieved in an inert atmosphere. In an aerobic environment, when the temperature exceeds 370 °C, the C / C composite can begin to oxidize, and the oxidation rate increases rapidly with the increase of temperature. , If there is no anti-oxidation measures, the long-term use of C / C composite materials in a high-temperature oxidizing environment will inevitably lead to catastrophic consequences. To make C / C composites work reliably...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/89
CPCC04B41/52C04B41/89C04B2235/9684C04B41/5059C04B41/4545C04B41/455C04B41/507
Inventor 李贺军王佩佩张雨雷王翰辉李涛
Owner NORTHWESTERN POLYTECHNICAL UNIV
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