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Carbon/carbon composite material with antioxidant coating, preparation method and application thereof

A carbon composite material and anti-oxidation coating technology, which is applied in the field of long-term medium and high temperature anti-oxidation coatings, can solve the problems of difficulty in ensuring coating integrity, easy cracking and peeling, thermal shock resistance and high temperature erosion resistance, etc. , to achieve the effect of being beneficial to the protection of the environment and construction personnel, good thermal shock and thermal damage resistance, and no volatile irritating odor

Active Publication Date: 2017-10-13
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of ceramic coating has three obvious defects in the application of carbon-carbon anti-oxidation: First, due to the intrinsic brittleness of ceramic materials, the thermal expansion coefficient is too different from the carbon matrix, and the thermal stress is large during cooling, which is easy to crack and peel off. Thermal shock resistance The performance is very poor, and the thermal shock resistance and high temperature erosion resistance are not good; the second is that due to the existence of open cracks, its anti-oxidation effect is not ideal, and it is not suitable for long-term anti-oxidation application environments, nor is it suitable for medium and low temperature applications; It is the limitation of the ceramic coating preparation method, it is not suitable for complex and large components, and it is difficult to ensure the integrity of the coating
However, for the use temperature higher than 1200°C and above, especially the use temperature as high as 1400°C, its long-term anti-oxidation effect cannot meet the application requirements

Method used

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  • Carbon/carbon composite material with antioxidant coating, preparation method and application thereof
  • Carbon/carbon composite material with antioxidant coating, preparation method and application thereof
  • Carbon/carbon composite material with antioxidant coating, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Cut the three-dimensional chemical vapor deposited carbon / carbon composite matrix into different shapes as required. The density of the carbon / carbon composite matrix is ​​1.5g / cm 3 . Grind the surface of the substrate with 400# sandpaper to remove chamfers, and then ultrasonically clean with water and absolute ethanol for 20 minutes, and place it in a drying box at 80°C for 24 hours and take it out for use.

[0055] Weigh 85wt.% Si powder, 10wt.% C powder, 5wt.% Al 2 O 3 The powder is mixed and ball milled for 5 hours to obtain a mixed powder. Put the mixed powder into the graphite crucible, and then fill the carbon / carbon composite material sample in the mixed powder completely, then place the graphite crucible in the high-temperature furnace with graphite heating element, evacuated to 0.08Pa and flush with Ar With gas protection, the furnace temperature is increased to 1800°C at a rate of 6°C / min and kept for 2 hours. The power is turned off and the temperature is natur...

Embodiment 2

[0061] Cut the chemical vapor deposited three-dimensional finely woven carbon / carbon composite matrix into different shapes as required. The density of the carbon / carbon composite matrix is ​​1.6g / cm 3 . Grind and polish the surface with 100#-500# sandpaper respectively, then ultrasonically clean with water and absolute ethanol for 15 minutes, place in a drying box at 120°C for 24h, and then take it out for use.

[0062] Weigh 90wt.% Si powder, 8wt.% C powder, 2wt.% Al 2 O 3 The powder is mixed and ball milled for 5 hours to obtain a mixed powder. Put the mixed powder into the graphite crucible, and then fill the carbon / carbon composite material sample completely in the mixed powder, then place the graphite crucible in the high-temperature furnace with graphite heating element, evacuated to 0.08Pa and flush with Ar With gas protection, the furnace temperature is increased to 2000°C at a rate of 6°C / min and kept for 2 hours. The power is turned off and the temperature is naturally...

Embodiment 3

[0068] The carbon / carbon composite material matrix is ​​made of short fiber mesh needled felt, chemical vapor deposition combined with impregnation carbonization and densification process, and cut into different shapes as required. The matrix density is 1.7g / cm 3 . Grind and polish the surface with 100#-500# sandpaper, then ultrasonically clean with water and absolute ethanol for 25 minutes, place in a drying box at 120°C for 24 hours, and take out for use.

[0069] Weigh 85wt.% Si powder, 10wt.% C powder, 5wt.% Al 2 O 3 The powder is mixed and ball milled for 5 hours to obtain a mixed powder. Put the mixed powder into the graphite crucible, and then fill the carbon / carbon composite material sample completely in the mixed powder, then place the graphite crucible in the high-temperature furnace with graphite heating element, evacuated to 0.08Pa and flush with Ar With gas protection, the furnace temperature is increased to 1900°C at a rate of 6°C / min and kept for 2 hours. The power...

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Abstract

The invention relates to a carbon / carbon composite with an anti-oxidant coating, a preparation method and the application thereof. The carbon / carbon composite comprises a carbon / carbon composite substrate, a SiC layer and a second coating, wherein the carbon / carbon composite substrate is uniformly coated with the SiC layer; the SiC layer is coated with the second coating; the second coating is a zirconium-containing glass ceramic coating; the second coating comprises the following components by mass: 55-85% of SiO2, 5-35% of ZrO2, 2-10% of Al2O3, 5-15% of B2O3, 1-3% of Li2O and 2-6% of Y2O3. The preparation method comprises the following steps: preparing the SiC layer by a pack siliconizing process; preparing the second coating by a brushing method. The process of the invention is simple and convenient to operate; the coating is controllable in thickness, firmly and uniformly bonded to the carbon / carbon composite substrate, excellent in oxidation resistance and thermal shock resistance below 1400 DEG C, and capable of realizing industrial production.

Description

Technical field [0001] The invention relates to a carbon / carbon composite material with an anti-oxidation coating, a preparation method and application thereof, and belongs to the technical field of long-term, medium and high-temperature anti-oxidation coatings. Background technique [0002] Carbon / carbon composites have low density and excellent high-temperature mechanical properties, and have been widely used in the aerospace field. However, the carbon / carbon composite material has poor oxidation resistance. The oxidation reaction begins to occur at 370°C in an aerobic atmosphere, and the oxidation intensifies as the temperature rises above 450°C, which seriously affects its mechanical and physical properties and limits its use in an aerobic environment. Long-term application in the. [0003] The carbon / carbon composite material used in aircraft brake discs has a braking temperature of up to 900°C. Although a single braking time is as short as tens of seconds, anti-oxidation mea...

Claims

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Application Information

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IPC IPC(8): C04B41/89
CPCC04B41/009C04B41/52C04B41/89C04B2235/9684C04B35/52C04B41/5059C04B41/4545C04B41/5023C04B41/4535
Inventor 曾凡浩古一李漪
Owner CENT SOUTH UNIV
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