Method for raising service life of coat layer of heat barrier by surface modification of metal binder course

A technology of surface modification and thermal barrier coating, applied in metal material coating process, coating, melt spraying and other directions, can solve the problem of low energy consumption, and achieve the improvement of diffusion, uniform distribution of aluminum, and long service life. Effect

Inactive Publication Date: 2007-10-10
CIVIL AVIATION UNIV OF CHINA
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  • Summary
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Problems solved by technology

Chinese Invention Patent No. 03111363.X discloses a NiCoCrAlYSiB hot-corrosion-resistant coating and its preparation method. The method uses arc ion plating technology to prepare the above-mentioned hot-corrosion-resistant coating, which has high energy density, high efficiency, energy Compared with the detonation spraying method, it shows certain advantages in the production of MCrAlY bonding layer with high density, high bonding strength and low internal stress level, and excellent resistance to high temperature oxidation, but the above two methods do not involve The technical content of improving and enhancing the thermal shock resistance and service life of thermal barrier coatings by modifying the surface layer of the metal bonding layer and intervening and controlling the generation and growth of thermal growth oxide (TGO)

Method used

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Embodiment 1

[0017] The method for improving the service life of the thermal barrier coating by modifying the surface of the metal bonding layer provided by the present invention includes the following steps in order: 1) cleaning and sandblasting the surface of the substrate according to the conventional process; The sonic flame spraying method deposits a commonly used metal bonding layer of the MCrAlY alloy system on the surface of the substrate after the above treatment, wherein M is a mixture of Ni, Co or Ni and Co, the powder particle size is 10-40μm, and the coating thickness is 0.10mm ; 3) with Al 2 o 3 The powder is used as the jet bombardment particle material, and the supersonic cold air jet bombardment surface method is used to modify the surface of the above metal bonding layer to refine the grain / particle structure of the surface layer of the bonding layer, wherein the particle size of the jet bombardment material is 30-80μm , the gas temperature is 25°C, the gas pressure is...

Embodiment 2

[0019] The method for improving the service life of the thermal barrier coating by modifying the surface of the metal bonding layer provided by the present invention includes the following steps in order: 1) cleaning and sandblasting the surface of the substrate according to the conventional process; 2) using plasma The metal bonding layer of the MCrAlY alloy system commonly used is deposited on the substrate surface after the above-mentioned treatment by the spraying method, wherein M is a mixture of Ni, Co or Ni and Co, the powder particle size is 30-100 μm, and the coating thickness is 0.20 mm; 3 ) to Al 2 o 3 The powder is used as the jet bombardment particle material, and the supersonic cold air jet bombardment surface method is used to modify the surface of the above metal bonding layer to refine the grain / particle structure of the surface layer of the bonding layer, wherein the particle size of the jet bombardment material is 50-100μm , the gas temperature is 120°C, ...

Embodiment 3

[0021] The method for improving the service life of the thermal barrier coating by modifying the surface of the metal bonding layer provided by the present invention includes the following steps in order: 1) cleaning and sandblasting the surface of the substrate according to the conventional process; The sonic flame spraying method deposits a commonly used metal bonding layer of the MCrAlY alloy system on the surface of the substrate after the above treatment, wherein M is a mixture of Ni, Co or Ni and Co, the powder particle size is 30-60μm, and the thickness is 0.30mm; 3 ) to Al 2 o 3 The powder is used as the jet bombardment particle material, and the supersonic cold air jet bombardment surface method is used to modify the surface of the above metal bonding layer to refine the grain / particle structure of the surface layer of the bonding layer, wherein the particle size of the jet bombardment material is 130-250μm , the gas temperature is 185°C, the gas pressure is 3.0MPa...

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Abstract

This invention discloses a method for increasing the service life of thermal barrier coating layer by surface modification of metal bonding layer. The method comprises: washing and sand-blasting the matrix surface, depositing a metal bonding layer of MCrAlY series alloy onto the matrix surface by supersonic flame spray or plasma spray, performing surface modification on the metal bonding layer by supersonic coolant air injection of Al2O3 particles, and depositing conventional ZrO2-Y2O3 ceramic surface layer onto the metal bonding layer by plasma spray to obtain the thermal barrier coating layer. The method utilizes supersonic coolant air injection of Al2O3 particles to change the surface grain/particle structure, surface morphology and surface stress of the metal bonding layer. The method can realize finer surface grains/particles, and more uniform composition distribution, which can improve the thermal shock resistance of the thermal barrier coating layer, and increase its service life.

Description

technical field [0001] The invention belongs to the technical field of coating preparation, and in particular relates to a method for improving the service life of a thermal barrier coating by modifying the surface of a metal bonding layer. Background technique [0002] With the advancement of aerospace technology, aviation gas turbines are developing towards high flow ratio, high thrust-to-weight ratio and high turbine inlet temperature. However, with the continuous increase of gas temperature and gas pressure, the existing high-temperature alloys have been difficult to meet the requirements, thus promoting the development and application of technology for reducing the temperature of engine hot-end components. In addition to improving cooling technology, preparing thermal barrier coating (TBC) on the surface of superalloy hot end parts is one of the important means. [0003] Most of the typical thermal barrier coatings for aviation used in practical applications adopt a do...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/00C23C4/10C23C4/06C23C4/02C21D7/06C23C4/073C23C4/11C23C4/129C23C4/134
Inventor 王志平冯日宝纪朝辉陈亚军
Owner CIVIL AVIATION UNIV OF CHINA
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