Method for improving CMAS corrosion resistance of thermal barrier coating

A technology of thermal barrier coating and capacity, applied in the direction of coating, metal material coating process, fusion spraying, etc., can solve problems such as corrosion, and achieve the effect of simple process, small weight gain and high melting point

Pending Publication Date: 2021-11-26
苏州金航纳米技术研究有限公司
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for improving the CMAS corrosion resistance of the thermal barrier coating, adopting a multi-layer thermal barrier coating design, including a bonding layer, a ceramic layer, a laser remelting layer and a pre-corrosion layer, Improving the surface state of the thermal barrier coating can effectively solve the problem of CMAS corrosion of the thermal barrier coating during service and improve the service life of the thermal barrier coating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Grinding, polishing and sand blasting treatment at the surface of the DD6 nickel-based single crystal sample, and prepared a Nicocral bonding layer using a plasma spray method, and the specific process is, the spray distance is 110mm, the spray voltage is 42V, the spray current 710A, The argon flow rate was 80 l / min, and the powder distribution rate was 60 g / min, which had a thickness of 60 μm. Subsequently, vacuum heat treatment is carried out, and the specific process is, vacuum 10 -3 PA, 900 ° C for 10 h, cooled to room temperature with the furnace, and then surface sandblasting treatment, the specific process is: sand blast operation pressure 0.2 MPa, medium particles diameter 50 μm. Spray GD in a sample surface of the prepared bonding layer 2 Zr 2 O 7 The ceramic layer, the specific process is, the spray distance is 110 mm, the spray voltage 60V, the spray current 850a, the argon flow rate 80 l / min, the powder distribution rate of 80 g / min, the thickness of...

Embodiment 2

[0032] (1) Grinding, polishing and sand blasting treatment at the surface of the DD6 nickel-based single crystal sample, and prepared a Nicocral bonding layer using a plasma spray method, and the specific process is, the spray distance is 110mm, the spray voltage is 42V, the spray current 710A, The argon flow rate was 80 l / min, and the powder distribution rate was 60 g / min, which had a thickness of 60 μm. Subsequently, vacuum heat treatment is carried out, and the specific process is, vacuum 10 -3 PA, 900 ° C for 10 h, cooled to room temperature, followed by a surface sand blast treatment, and the specific process was 0.2 MPa, sand blasting operation pressure 0.2 MPa, and the medium particles were 50 μm. Spray GD in a sample surface of the prepared bonding layer2 Zr 2 O 7 The ceramic layer, the specific process is, the spray distance is 110 mm, the spray voltage 60V, the spray current 850a, the argon flow rate 80 l / min, the powder distribution rate of 80 g / min, the thickne...

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Abstract

The invention relates to the technical field of thermal barrier coating surface corrosion and protection, in particular to a method for improving the CMAS corrosion resistance of a thermal barrier coating. The thermal barrier coating is of a multi-layer structure and comprises a bonding layer, a ceramic layer, a remelting layer formed by laser remelting part of the ceramic layer and a pre-corrosion layer formed through high-temperature pretreatment. Surface cracks of the ceramic layer are remelted through laser, and the surface of the ceramic layer is coated with a layer of pre-designed mixed oxide. According to the remelting layer, nanosecond pulse laser is used for carrying out surface modification treatment on the ceramic layer, the surface structure of the ceramic layer can be optimized, the density can be improved, the porosity can be reduced, and a diffusion channel of CMAS can be blocked. According to the pre-corrosion layer, the pre-designed mixed oxide and a gadolinium zirconate ceramic layer react in advance under the high-temperature condition, an apatite phase reaction layer is formed, and therefore the CMAS corrosion resistance of the thermal barrier coating is greatly improved.

Description

Technical field [0001] The present invention relates to the field of surface corrosion and protection technology of the thermal barrier coating, in particular a method of improving the anti-CMAS corrosion capacity of the thermal barrier coating. Background technique [0002] The thermal barrier coating is widely used in the high temperature components of the aviation turbine engine, thereby increasing the efficiency and overall performance of the engine. With the high propulsion ratio, high efficiency development requirements, the internal environment temperature of the engine has been up to 1600 ° C, and the traditional 8ysz (8% Y " 2 O 3 -ZR 2 O 3 The material is no longer able to meet the needs of use. Rare earth zirconate salt materials such as zirconate (GD 2 Zr 2 O 3 ),, Due to its lower thermal conductivity, more excellent high temperature phase stability, more matching coefficients, and better fracture toughness, it is expected to replace 8ysz to become an alternative mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/073C23C4/11C23C4/18C04B35/14C04B35/622
CPCC23C4/134C23C4/073C23C4/11C23C4/18C04B35/14C04B35/62222C04B2235/3208C04B2235/3217C04B2235/3232C04B2235/3227
Inventor 钱伟花银群蔡杰戴峰泽陈瑞芳
Owner 苏州金航纳米技术研究有限公司
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