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Preparation method of environmental barrier coating layer

An environmental barrier and coating technology, applied in coating, metal material coating process, fusion spraying, etc., can solve the problems of phase change, thermal cycle performance reduction of environmental barrier coating, cracks, etc.

Active Publication Date: 2017-02-22
GUANGDONG INST OF NEW MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In the third-generation environmental barrier coating preparation technology, atmospheric plasma spraying (APS) occupies a dominant position (Jiao Chunrong et al., Research on the performance of plasma sprayed BSAS environmental barrier coatings, "China Materials Progress", 2016(35), p466-471) , but this technology has several disadvantages. First, in the spraying process, due to the preparation in the atmospheric environment, the preheating temperature of the substrate is not high. There are many cracks. In addition, when the mullite intermediate layer is sprayed, the cooling rate of the mullite crystal grains during the solidification and condensation process is too fast, so that there are more metastable mullite in the coating, resulting in a phase change during the service process. , leading to the formation of cracks
Secondly, because APS works in the atmospheric environment, when the Si coating is prepared, it will be oxidized to form silicon dioxide, which will cause a thermal mismatch with the mullite intermediate layer, resulting in a decrease in the thermal cycle performance of the environmental barrier coating.

Method used

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  • Preparation method of environmental barrier coating layer

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Experimental program
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Effect test

Embodiment 1

[0016] Taking the SiC composite material as the matrix, the matrix is ​​cleaned by ultrasonic decontamination using gasoline, acetone and alcohol in sequence, and then the matrix is ​​installed on the fixture. Si coating, mullite coating and Yb coating were sequentially prepared on the cleaned substrate by plasma spraying-physical vapor deposition technology. 2 SiO 5 coating. Among them, the preparation parameters of the Si coating are: the net power of the spray gun is 40kW, the argon gas in the plasma gas is 90NSPM, the hydrogen gas in the plasma gas is 5NSPM, the powder feeding rate is 15g / min, the spraying distance is 30mm, and the substrate temperature is controlled at 900°C. Among them, the parameters of spraying mullite coating are: the net power of the spray gun is 60kW, the argon gas in the plasma gas is 60NSPM, the helium gas in the plasma gas is 40NSPM, the powder feeding rate is 18g / min, the spraying distance is 950mm, and the substrate temperature is controlled a...

Embodiment 2

[0018] Taking the SiC composite material as the matrix, the matrix is ​​cleaned by ultrasonic decontamination using gasoline, acetone and alcohol in sequence, and then the matrix is ​​installed on the fixture. Si coating, mullite coating and Yb coating were sequentially prepared on the cleaned substrate by plasma spraying-physical vapor deposition technology. 2 SiO 5 coating. Among them, the preparation parameters of the Si coating are: the net power of the spray gun is 45kW, the argon gas in the plasma gas is 100NSPM, the hydrogen gas in the plasma gas is 7NSPM, the powder feeding rate is 17g / min, the spraying distance is 40mm, and the substrate temperature is controlled at 900°C. Among them, the parameters of spraying mullite coating are: the net power of the spray gun is 65kW, the argon gas in the plasma gas is 70NSPM, the helium gas in the plasma gas is 50NSPM, the powder feeding rate is 20g / min, the spraying distance is 1000mm, and the substrate temperature is controlled...

Embodiment 3

[0020] Taking the SiC composite material as the matrix, the matrix is ​​cleaned by ultrasonic decontamination using gasoline, acetone and alcohol in sequence, and then the matrix is ​​installed on the fixture. Si coating, mullite coating and Yb coating were sequentially prepared on the cleaned substrate by plasma spraying-physical vapor deposition technology. 2 SiO 5 coating. Among them, the preparation parameters of the Si coating are: the net power of the spray gun is 50kW, the argon gas in the plasma gas is 110NSPM, the hydrogen gas in the plasma gas is 10NSPM, the powder feeding rate is 20g / min, the spraying distance is 50mm, and the substrate temperature is controlled at 900°C. Among them, the parameters of spraying mullite coating are: the net power of the spray gun is 70kW, the argon gas in the plasma gas is 80NSPM, the helium gas in the plasma gas is 60NSPM, the powder feeding rate is 25g / min, the spraying distance is 1050mm, and the substrate temperature is controlle...

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Abstract

The invention discloses a preparation method of an environmental barrier coating layer. The preparation method comprises the following steps: a plasma spraying-physical deposition technology is adopted to prepare an Si coating layer on a silicon base composite material in sequence with Si powder with a particle size of 15-45 microns, mullite powder with a particle size of 15-40 microns and Yb2SiO5 powder with a particle size of 10-40 microns as raw materials; a mullite coating layer is prepared on the Si coating layer; a Yb2SiO5 coating layer is prepared on the mullite coating layer; in the spraying process, the temperature of the silicon base composite material is controlled within 900-1100 DEG C; and the silicon base composite material environmental barrier coating layer is prepared. Compared with a traditional preparation technology of the environmental barrier coating layer, the preparation method of the environmental barrier coating layer can reduce the number of cracks in the coating layer, can reduce oxidation of the Si coating layer, and prevents non-crystallizaing phenomenon of grains in the mullite coating layer.

Description

technical field [0001] The invention relates to a method for preparing a protective coating of a silicon-based composite material. Background technique [0002] In order to achieve a major breakthrough in high thrust-to-weight ratio and high efficiency of aero-engines, it is necessary to increase the temperature of the gas in the engine, and the increase in gas temperature will correspondingly increase the surface temperature of the hot-end parts of the high-pressure turbine. The surface temperature of the high-pressure turbine hot-end parts of the high-thrust-to-weight ratio aero-engine reaches above 1400°C, which greatly exceeds the temperature range that the existing nickel-based superalloys can withstand. To meet the material requirements of advanced aero-engines, it is necessary to develop new high-temperature structural materials that can replace nickel-based superalloys at higher temperatures. [0003] Silicon-based non-oxide ceramics SiC, Si 3 N 4 It is considered...

Claims

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Application Information

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IPC IPC(8): C23C4/134C23C4/04C23C4/11
CPCC23C4/04
Inventor 张小锋刘敏周克崧邓春明邓畅光宋进兵毛杰张吉阜杨焜徐丽萍
Owner GUANGDONG INST OF NEW MATERIALS