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Multilayer structure environmental barrier coating for silicon carbide ceramic matrix composite material and preparation method thereof

A silicon carbide ceramic-based, multi-layer structure technology, applied in the field of materials, can solve problems such as inability to use for a long time, failure, etc., and achieve the effects of good bonding, solving thermal mismatch, and improving thermal protection performance.

Pending Publication Date: 2021-06-11
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the environmental barrier coating systems with more application value include YSZ system, BSAS system and rare earth ceramic system, etc., but when the temperature is higher than 1200 ℃, they all fail to varying degrees and cannot be used for a long time.

Method used

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  • Multilayer structure environmental barrier coating for silicon carbide ceramic matrix composite material and preparation method thereof
  • Multilayer structure environmental barrier coating for silicon carbide ceramic matrix composite material and preparation method thereof
  • Multilayer structure environmental barrier coating for silicon carbide ceramic matrix composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] A multilayer structure environmental barrier coating for silicon carbide ceramic matrix composites and a preparation method thereof, such as figure 1 shown, including the following steps:

[0032] (1) The silicon carbide ceramic matrix composite material is subjected to sandblasting pretreatment. The sandblasting process conditions are: 100 mesh corundum sand, compressed air pressure of 0.6Mpa, and then tested with a roughness meter. The pretreated silicon carbide ceramic matrix The surface roughness of the composite material is 13.5μm;

[0033] (2) ultrasonically clean the silicon carbide ceramic matrix composite material that has been sandblasted in step (1) in alcohol with a concentration of 98%, for 12 minutes, and dry at 100°C;

[0034] (3) The silicon carbide ceramic matrix composite material that has been ultrasonically cleaned and dried in step (2) is prepared on the surface of the silicon carbide ceramic matrix composite material by atmospheric plasma spraying...

Embodiment 2

[0042] A multilayer structure environmental barrier coating for silicon carbide ceramic matrix composites and a preparation method thereof, such as figure 2 shown, including the following steps:

[0043] (1) The silicon carbide ceramic matrix composite material is pretreated by grinding. The grinding process conditions are as follows: the grinding medium is a 600-mesh diamond grinding wheel, the speed of the grinding wheel is 120 rpm, and the surface roughness of the pretreated silicon carbide ceramic matrix composite material is 5.8μm;

[0044] (2) Ultrasonic cleaning the silicon carbide ceramic matrix composite material that has been sandblasted in step (1) in 98% alcohol for 28 minutes, and then dried;

[0045] (3) Prepare the bonding layer Si on the surface of the silicon carbide ceramic matrix composite material that has been ultrasonically cleaned and dried in step (2) by atmospheric plasma spraying process. The particle size of the Si powder used for spraying is 35-60...

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Abstract

The invention relates to a multilayer structure environmental barrier coating for a silicon carbide ceramic matrix composite material and a preparation method of the multilayer structure environmental barrier coating. The method comprises the following steps: carrying out sand blasting, polishing, ultrasonic cleaning and drying on the silicon carbide ceramic matrix composite material; sequentially preparing a bonding layer Si, a middle first layer Yb2O3-2SiO2, a middle second layer Yb2O3-SiO2 and an outer layer La2O3-2MgO-11Al2O3 on the surface of a pretreated silicon carbide ceramic matrix composite material by using an atmospheric plasma spraying method. The multilayer structure environmental barrier coating prepared by the method is compactly combined with the silicon carbide ceramic matrix composite material, can provide effective protection for the composite material in an oxygen-enriched high-temperature environment, and can be used at the temperature of 1350 DEG C for more than 500 hours.

Description

technical field [0001] The invention relates to the field of material technology, and relates to a multilayer structure environmental barrier coating for silicon carbide ceramic matrix composite materials and a preparation method thereof. Background technique [0002] With the upgrading of aero-engines, their thrust-to-weight ratios are increasing, and the key technologies involved include increasing the temperature of the gas and reducing the weight of the engine. At present, traditional high-temperature alloys can no longer meet the above requirements, and new materials are urgently needed to replace them. Due to its low density, high strength, high modulus, high temperature resistance, corrosion resistance and designability, silicon carbide ceramic matrix composites have become a hotspot in the research and application of aerospace engines in recent years. With the application of silicon carbide ceramic matrix composites in aero-engines, people are paying more and more a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/89C04B41/53C23C4/02C23C4/04C23C4/11C23C4/134
CPCC04B41/89C04B41/52C04B41/009C04B41/5315C23C4/134C23C4/04C23C4/11C23C4/02C04B41/91C04B35/565C04B41/5096C04B41/4527C04B41/5045C04B41/5035C04B41/5029C04B41/5031
Inventor 曹学强胡庆黄晶琪李归邓龙辉董淑娟蒋佳宁曹沁周鑫
Owner WUHAN UNIV OF TECH
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