Anti-oxidation bonding layer and preparation method of thermal barrier coating of anti-oxidation bonding layer

A technology of thermal barrier coating and bonding layer, which is applied in the direction of coating, metal material coating process, fusion spraying, etc., and can solve the problem of uneven structure, poor anti-stripping ability of oxide layer, and affecting the service life of the coating, etc. problems, to achieve the effect of long service life, uniform structure and high working temperature

Pending Publication Date: 2022-05-06
上海交通大学包头材料研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that the NiCoCrAlYHf alloy has better high temperature oxidation resistance than the traditional bonding layer MCoAlY (M=Ni, Co or NiCo), but the microstructure of the coating prepared by atmospheric plasma spraying is not uniform, and there are internal oxidation and oxidation resistance of the oxide layer. Disadvantages such as poor peeling ability affect the service life of the coating

Method used

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  • Anti-oxidation bonding layer and preparation method of thermal barrier coating of anti-oxidation bonding layer
  • Anti-oxidation bonding layer and preparation method of thermal barrier coating of anti-oxidation bonding layer
  • Anti-oxidation bonding layer and preparation method of thermal barrier coating of anti-oxidation bonding layer

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Effect test

Embodiment 1

[0027] (1) Firstly, ultrasonically clean the superalloy substrate with acetone and alcohol in sequence. After drying, use Al with a particle size of 60 mesh 2 o 3 , cold sandblasting the substrate. The sandblasting pressure is 0.5MPa, and the surface roughness Ra after sandblasting is 18±5μm.

[0028] (2) When using high-speed gas flame spraying, first preheat the metal substrate 3 times, the temperature of the metal substrate is controlled below 200°C, the distance between the spray gun and the metal bonding layer is 180mm, and the moving speed of the spray gun is 1000mm / s. The powder feeding speed is 3r / min, the propane pressure is 85PSI, the air pressure is 90PSI, the hydrogen pressure is 20PSI, and the nitrogen pressure is 20PSI.

[0029] (3) In order to obtain a metal bonding layer with uniform surface roughness, the bonding layer is treated by thermal sandblasting. Sandblasting particles are 180 mesh Al 2 o 3 , the distance between the spray gun and the metal bondi...

Embodiment 2

[0034] (1) Firstly, ultrasonically clean the superalloy substrate with acetone and alcohol in sequence. After drying, use Al with a particle size of 60 mesh 2 o 3 , cold sandblasting the substrate. The sandblasting pressure is 0.8MPa, and the surface roughness Ra after sandblasting is 19±4μm.

[0035] (2) When using high-speed gas flame spraying, first preheat the metal substrate 3 times, the temperature of the metal substrate is controlled below 200°C, the distance between the spray gun and the metal bonding layer is 200mm, and the moving speed of the spray gun is 1000mm / s. The powder feeding speed is 5r / min, the propane pressure is 87PSI, the air pressure is 92PSI, the hydrogen pressure is 20PSI, and the nitrogen pressure is 20PSI.

[0036] (3) In order to obtain a metal bonding layer with uniform surface roughness, the bonding layer is treated by thermal sandblasting. Sandblasting particles are 200 mesh Al 2 o 3 , the distance between the spray gun and the metal bondi...

Embodiment 3

[0040] (1) Firstly, ultrasonically clean the superalloy substrate with acetone and alcohol in sequence. After drying, use Al with a particle size of 60 mesh 2 o 3 , cold sandblasting the substrate. The sandblasting pressure is 0.8MPa, and the surface roughness Ra after sandblasting is 19±4μm.

[0041] (2) When using high-speed gas flame spraying, first preheat the metal substrate 3 times, the temperature of the metal substrate is controlled below 200°C, the distance between the spray gun and the metal bonding layer is 180mm, and the moving speed of the spray gun is 1000mm / s. The powder feeding speed is 3r / min, the propane pressure is 85PSI, the air pressure is 90PSI, the hydrogen pressure is 20PSI, and the nitrogen pressure is 20PSI.

[0042] (3) In order to obtain a metal bonding layer with uniform surface roughness, the bonding layer is treated by thermal sandblasting. Sandblasting particles are 220 mesh Al 2 o 3 , the distance between the spray gun and the metal bondi...

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Abstract

The invention relates to a preparation method of an anti-oxidation bonding layer and a thermal barrier coating of the anti-oxidation bonding layer, which comprises the following steps of: (1) sequentially carrying out ultrasonic cleaning on a metal matrix by using acetone and alcohol, and then carrying out cold sand blasting treatment by using Al2O3 particles to obtain higher surface roughness; (2) depositing a metal bonding layer on the sand-blasted substrate through a high-speed gas flame spraying technology; (3) the surface of the metal bonding layer is treated through thermal sand blasting, and certain surface roughness and thickness are obtained; (4) depositing a ceramic layer on the bonding layer by adopting an atmospheric plasma spraying technology; and (5) carrying out vacuum heat treatment on the prepared thermal barrier coating. Compared with the prior art, the NiCoCrAlYHf bonding layer is deposited on the high-temperature alloy substrate through the high-speed gas flame spraying technology, the prepared bonding layer is more uniform in organization structure and has more excellent oxidation resistance, and meanwhile the ceramic layer is prepared on the bonding layer through the atmosphere plasma spraying technology by regulating and controlling the thickness and surface roughness of the bonding layer.

Description

technical field [0001] The invention relates to the technical field of thermal barrier coatings, in particular to an anti-oxidation bonding layer and a preparation method of the thermal barrier coatings. Background technique [0002] As an advanced material system, thermal barrier coatings are widely used on the surface of superalloy substrates serving in high temperature environments, thereby reducing the surface temperature of the substrate materials. Usually, the thermal barrier coating uses a ceramic layer with high temperature resistance and low thermal conductivity as the top layer, and its function is to form a temperature gradient along the direction perpendicular to the interface between the coating and the substrate. subject to wear and corrosion. In addition, there is a metal bonding layer at the interface between the substrate and the ceramic layer to reduce the thermal expansion coefficient mismatch between the ceramic layer and the substrate and improve the bo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/129C23C4/134C23C4/02C23C4/18C23C4/073C23C4/10
CPCC23C4/129C23C4/134C23C4/02C23C4/18C23C4/073C23C4/10
Inventor 刘轩溱赵晓峰陆杰倪娜
Owner 上海交通大学包头材料研究院
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