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Method for preparing carbon/carbon composite material antioxidation coating layer

A carbon composite material and composite material technology, which is applied in the field of preparation of anti-oxidation coatings, can solve the problems of weak bonding strength of the coating, easy to fall off, unable to achieve effective protection of the substrate, etc., and achieve the effect of eliminating the stress of the coating.

Inactive Publication Date: 2009-10-28
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, a common defect of the anti-oxidation coatings provided in the literature is that the bonding strength of the coating is weak, and it is easy to fall off under the environment of high-speed airflow, and cannot effectively protect the substrate.

Method used

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  • Method for preparing carbon/carbon composite material antioxidation coating layer
  • Method for preparing carbon/carbon composite material antioxidation coating layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: After polishing the C / C composite material with No. 400, No. 600 and No. 800 sandpaper respectively, wash it with distilled water, and dry it for later use.

[0019] Weigh 70% of Si powder, 20% of C powder and 10% of Al respectively according to mass fraction 2 o 3 powder, mixed and ball milled for 1 hour to prepare embedding powder; put half of the prepared embedding powder into a graphite crucible, put it into the treated C / C composite material, and then use the other half of the embedding material to mix C / C Composite material covering, plus a graphite crucible cover; the graphite crucible is placed in a vertical vacuum furnace with a graphite heating element, and after vacuuming, a protective gas with a flow rate of 600ml / min is introduced, and the temperature rises at a rate of 7.5°C / min Speed ​​up the furnace temperature to 1800°C, keep it warm for 3 hours, then lower it to 1200°C at a speed of 10°C / min, turn off the power and cool down naturally; t...

Embodiment 2

[0025] Embodiment 2: After polishing the C / C composite material with No. 400, No. 600 and No. 800 sandpaper, wash it with distilled water, and dry it for later use.

[0026] Weigh 75% of Si powder, 10% of C powder and 15% of Al respectively according to mass fraction 2 o 3 Al 2 o 3 powder, mixed and ball milled for 2 hours to prepare embedding powder; put half of the prepared embedding powder into a graphite crucible, put it into the treated C / C composite material, and then use the other half of the embedding material to mix the C / C Composite material covering, plus a graphite crucible cover; the graphite crucible is placed in a vertical vacuum furnace with a graphite heating element, after vacuuming, a protective gas with a flow rate of 550ml / min is introduced, and the temperature rises at a rate of 10°C / min. Speed ​​up the furnace temperature to 2000°C, keep it warm for 2 hours, then lower it to 1100°C at a speed of 8°C / min, turn off the power and cool down naturally; tha...

Embodiment 3

[0032] Embodiment 3: After polishing the C / C composite material with No. 400, No. 600 and No. 800 sandpaper, wash with distilled water, dry and set aside;

[0033] Weigh 80% of Si powder, 15% of C powder and 5% of Al respectively according to mass fraction 2 o 3 Al 2 o 3 powder, mixed and ball milled for 3 hours to prepare embedding powder; put half of the prepared embedding powder into a graphite crucible, put it into the treated C / C composite material, and then use the other half of the embedding material to mix the C / C Composite material covering, plus a graphite crucible cover; the graphite crucible is placed in a vertical vacuum furnace with a graphite heating element, after vacuuming, a protective gas with a flow rate of 500ml / min is introduced, and the temperature rises at a rate of 12.5°C / min Speed ​​up the furnace temperature to 2200°C, keep it warm for 1 hour, then lower it to 1000°C at a speed of 7°C / min, turn off the power and cool down naturally; that is, a SiC...

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Abstract

The invention discloses a method for preparing a carbon / carbon composite material antioxidation coating layer. The processed C / C composite material packet is buried in powder lot and put in a graphite crucible and processed for 1 to 3 hours at a temperature of between 1,800 and 2,200 DEG C; MoSi2 powder is sprayed on the surface of the C / C composite material with a SiC transition layer through supersonic plasma spraying equipment; the C / C composite material prepared with the SiC / MoSi2 coating layer is put to a high-temperature furnace and is subjected to heat treatment for 2 to 6 hours at a temperature of between 1,200 and 1,400 DEG C to remove the residual heat stress in the MoSi2 coating layer. The SiC transition coating layer prepared by an embedding method relieves thermal expansion coefficients of a C / C composite material matrix and the MoSi2 coating layer of the outer layer; and subsequently, a C / C composite material preparation piece is subjected to heat treatment to remove the stress of the coating layer so that the antioxidation time of the C / C composite material in static air at a temperature of more than 1,650 DEG C is improved from 200 to 300 to 400 hours compared with the prior art.

Description

technical field [0001] The invention relates to a preparation method of an anti-oxidation coating, in particular to a preparation method of an anti-oxidation coating of a carbon / carbon composite material. Background technique [0002] Carbon / carbon (hereinafter referred to as C / C) composites have low density and excellent high-temperature mechanical properties, especially the characteristics that the mechanical properties do not decrease but increase at high temperatures, making them the preferred materials for thermal structural parts of superb aircraft. However, C / C composites are easily oxidized at high temperatures. Oxidation will increase the pores and weaken the structure, resulting in rapid attenuation of strength and other mechanical properties, and the oxidation weight loss is 1%, and its strength drops by 10%. Therefore, the problem of high temperature oxidation resistance of C / C composites is the bottleneck to realize its practical application. Coating the surfac...

Claims

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Application Information

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IPC IPC(8): C04B41/85
Inventor 李贺军吴恒付前刚李克智马超魏建锋
Owner NORTHWESTERN POLYTECHNICAL UNIV
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