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A kind of carbon/carbon composite material multi-layer coating and preparation method thereof

A carbon composite material, multi-layer coating technology, applied in the direction of layered products, etc., can solve the problems of complex exhaust gas treatment, complex process, high toxicity and so on

Active Publication Date: 2016-08-24
GUANGDONG INST OF NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the CVD preparation method adopted is complicated, the corrosive gas used is highly toxic, and the tail gas treatment is complicated.

Method used

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  • A kind of carbon/carbon composite material multi-layer coating and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0026] 1) Cut the carbon / carbon composite material into a block sample of 15×15×10mm, grind it with 400#-800# sandpaper, then ultrasonically use acetone for 20min, and dry it at 150°C for 1 hour before use.

[0027] 2) Prepare the SiC bottom layer by brushing method: the ratio of material powder is: Si powder 79%, C powder 13%, Al 2 o 3 8% powder, put the powder into ethanol solution and stir evenly to form a slurry, brush the slurry evenly on the surface of the C / C composite material, the thickness of the brush coating is 200μm, put it into a graphite crucible after drying, put In the vacuum furnace, the temperature was raised to 1800°C at a rate of 10°C / min, and the temperature was kept for 2 hours under the protection of argon. Then the temperature was lowered to 1200° C. at a rate of 10° C. / min, and then cooled to room temperature with the furnace to obtain a SiC bottom layer.

[0028] 3) Carbon with SiC underlayer / The carbon composite matrix was ultrasonically cleane...

Embodiment 2

[0034] 1) Cut the carbon / carbon composite material into a block sample of 15×15×10mm, grind it with 400#-800# sandpaper, then ultrasonically use acetone for 30min, and dry it at 150°C for 1.5 hours before use.

[0035] 2) Prepare the SiC bottom layer by brushing method: the ratio of material powder is: Si powder 75%, C powder 15%, Al 2 o 3 10% powder, put the powder into the ethanol solution and stir evenly to form a slurry, brush the slurry evenly on the surface of the C / C composite material, the thickness of the brush coating is 100 μm, put it into a graphite crucible after drying, and put In the vacuum furnace, the temperature was raised to 1700°C at a rate of 10°C / min, and the temperature was kept for 1.5 hours, under argon protection. Then the temperature was lowered to 1200° C. at a rate of 10° C. / min, and then cooled to room temperature with the furnace to obtain a SiC bottom layer.

[0036] 3) Carbon with SiC underlayer / The carbon composite matrix was ultrasonical...

Embodiment 3

[0042] 1) Cut the carbon / carbon composite material into a block sample of 15×15×10mm, grind it with 400#-800# sandpaper, then ultrasonically use acetone for 40min, and dry it at 200°C for 1 hour before use.

[0043] 2) Prepare the SiC bottom layer by spraying method: when the argon flow rate is 40L / min, the H 2 The flow rate is 6L / min, the spray distance is 250mm, the current is 550A, the voltage is 50V, the powder feeding rate is 50g / min, and the thickness of the sprayed Si coating is 400μm. Then the sprayed Si coating was heat-treated in vacuum at 1800 °C for 2 hours to obtain the SiC bottom layer.

[0044] 3) Carbon with SiC underlayer / The carbon composite matrix was ultrasonically cleaned with acetone for 40 minutes, dried and placed in a vacuum chamber for later use.

[0045] 4) Pump the vacuum to below 5×10 -3 Pa, the temperature is 200°C, filled with argon gas, the pressure is 1.0Pa, the bias voltage is 800V, and the ion source is used to test the carbon with SiC b...

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Abstract

A carbon / carbon composite multilayer coating and a preparation method thereof. The multi-layer coating is sequentially composed of a SiC bottom layer, a SiC transition layer and alternating ceramic layers / SiC layers on a carbon / carbon composite material substrate. The preparation method of the carbon / carbon composite multilayer coating is that the preparation method of the SiC bottom layer is a brushing method, a spraying method or a magnetron sputtering method. The preparation method of the SiC transition layer and the ceramic layer / SiC layer alternate layer is as follows: the carbon / carbon composite material with the SiC bottom layer is ultrasonically cleaned with acetone and dried; it is cleaned by ion source sputtering; it is prepared by magnetron sputtering Alternating layers of SiC transition layer and ceramic layer / SiC layer. The multi-layer coating prepared by the invention has good oxidation resistance and thermal shock resistance at 1500°C. The preparation method of the invention has the characteristics of controllable thickness, and the prepared coating has good thickness uniformity.

Description

technical field [0001] The invention relates to a multilayer coating of carbon / carbon composite material and a preparation method thereof. Background technique [0002] Carbon / carbon composite material, that is, carbon fiber reinforced carbon matrix composite material, is a new type of high-performance composite material with designable performance and thermal shock resistance, especially suitable for applications requiring weight reduction and stable and reliable physical, chemical and mechanical properties. In extremely high temperature and ultra-high temperature environments, it has been successfully widely used in the field of aerospace. [0003] However, the high-temperature oxidation resistance of carbon / carbon composites is relatively poor. It starts to oxidize at 370°C in an aerobic environment, and rapidly oxidizes when it is higher than 500°C, and destructive damage occurs. The use environment of carbon / carbon composite materials is as high as 1000~2000℃, or even ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B9/00
Inventor 韦春贝代明江周克崧刘敏侯惠君林松盛胡芳石倩赵利曾威
Owner GUANGDONG INST OF NEW MATERIALS
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