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Preparation method of thermal barrier coating containing long-service-life antioxidant bonding layer

A thermal barrier coating, anti-oxidation technology, used in coatings, metal material coating processes, ion implantation plating, etc., can solve the problem that the high temperature mechanical properties and anti-oxidation properties of coatings cannot fully meet the needs Preparation of thermal barrier coating, low yield strength at high temperature, etc., to achieve the effect of dense and continuous oxide layer, excellent oxidation resistance, and uniform composition structure

Inactive Publication Date: 2015-05-20
HENAN PULAIMU COATING TECH +1
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Problems solved by technology

However, the high-temperature mechanical properties and oxidation resistance of such coatings can no longer fully meet the needs
Compared with it, (Ni,Pt)Al, the mainstream bonding layer material of modern aero-engine thermal barrier coatings, has more excellent high temperature oxidation resistance and high temperature creep strength, but the bonding layer has disadvantages: this technology uses precious metals Pt and CVD preparation process, the cost is high; secondly, the yield strength at high temperature is low, and under the action of high temperature stress, it is easy to form undulations at the interface between the ceramic layer and the bonding layer, which will cause cracks and cause thermal barrier coating failure
[0003] Studies have shown that the FeCrAlY alloy has better high temperature oxidation resistance than the traditional bonding layer, and the FeCrAlY layer can quickly form a dense layer of Al 2 o 3 (ie TGO), and TGO grows slowly, will not form Ni2Al2O4 brittle phase to destroy the compactness and continuity of the oxide layer, but has not been used to prepare the bonding layer of thermal barrier coating

Method used

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  • Preparation method of thermal barrier coating containing long-service-life antioxidant bonding layer
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  • Preparation method of thermal barrier coating containing long-service-life antioxidant bonding layer

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preparation example Construction

[0031] A method for preparing a thermal barrier coating containing a long-life anti-oxidation bonding layer, using the following steps:

[0032] (1) Degrease and sandblast the superalloy substrate in turn. During sandblasting, the sandblasting pressure is 0.1-0.7MPa, and the main component of sandblasting particles is Al 2 o 3 , the particle size is 16-120 mesh;

[0033] (2) preparing a metal bonding layer composed of FeCrAlY on the superalloy substrate by low-pressure plasma spraying, atmospheric plasma spraying, high-velocity oxygen flame spraying or high-speed compressed air flame spraying;

[0034] (3) A ceramic layer is deposited on the metal bonding layer by atmospheric plasma spraying, high-velocity oxygen flame spraying, supersonic plasma spraying, solution plasma spraying or electron beam physical vapor deposition, and the composition of the ceramic layer is 6-8wt% Y 2 o 3 Stable ZrO 2 or RE 2 Zr 2 o 7 , where RE is a rare earth element.

[0035] Step (2) When...

Embodiment 1

[0044] A method for preparing a thermal barrier coating containing a long-life anti-oxidation bonding layer, using the following steps:

[0045] (1) First, use Al with a particle size of 16 to 120 mesh for the superalloy substrate 1 2 o 3 , sandblasting the substrate to obtain a uniform surface roughness;

[0046] (2) Introduce a metal bonding layer 2 on the superalloy substrate 1 through atmospheric plasma spraying technology, and its composition is FeCrAlY. This method heats and melts or semi-melts the ceramic particles through a high-temperature plasma beam, and then quickly sprays it on the substrate. A coating with a layered structure is formed on the surface. Preheat the substrate 2 to 4 times before spraying. The specific parameters are: the composition of the coating is FeCrAlY, the temperature range of the substrate is 200-500°C, the distance between the spray gun and the substrate is 100-250mm, the moving speed of the spray gun is 300-1000mm / s, and the powder feed...

Embodiment 2

[0050] A method for preparing a thermal barrier coating containing a long-life anti-oxidation bonding layer, using the following steps:

[0051] (1) The superalloy substrate is degreased and sandblasted sequentially. During sandblasting, the sandblasting pressure is 0.1MPa, and the main component of sandblasting particles is Al 2 o 3 , the particle size is 16 mesh;

[0052] (2) Prepare a metal bonding layer composed of FeCrAlY on the metal substrate by atmospheric plasma spraying. The temperature of the metal substrate is controlled at 200 ° C, the distance between the spray gun and the metal bonding layer is 100 mm, and the moving speed of the spray gun is 300 mm / s. The powder rate is 10g / min, the powder feeding airflow is 0.5L / min, the voltage range is 100V, the spraying current range is 200A, the Ar gas flow rate range is 40L / min, H 2 The gas flow range is 15L / min;

[0053] (3) Deposit a ceramic layer on the metal bonding layer by atmospheric plasma spraying, the process...

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Abstract

The invention relates to a preparation method of a thermal barrier coating containing a long-service-life antioxidant bonding layer. The preparation method comprises the following steps: (1) sequentially performing deoiling and sand blasting treatment on a high-temperature alloy matrix; (2) preparing a metal bonding layer on the high-temperature alloy matrix by virtue of atmosphere plasma spraying, low-pressure plasma spraying, high-speed oxygen flame spraying or high-speed compressed air flame spraying; and (3) then depositing a ceramic layer on the metal bonding layer by virtue of atmosphere plasma spraying, high-speed oxygen flame spraying, supersonic plasma spraying, solution plasma spraying or electron beam physical vapor deposition. Compared with the prior art, the thermal barrier coating prepared by using an FeCrAlY bonding layer, disclosed by the invention, has higher working temperature and slower oxidation layer growth rate compared with that of a conventional MCrAlY thermal barrier coating (M refers to Ni and Co) so as to avoid the interfacial properties of the bonding layer and the ceramic layer from forming a brittle Ni2Al2O4 phase; and the thermal barrier coating has excellent high-temperature oxidation resistance and longer service life.

Description

technical field [0001] The invention relates to the field of thermal barrier coatings, in particular to a preparation method of a thermal barrier coating containing a long-life anti-oxidation bonding layer. Background technique [0002] Thermal barrier coatings usually refer to ceramic coatings that are deposited on metal surfaces and have good heat insulation effects. They are mainly used to reduce the working temperature of the substrate and prevent high-temperature oxidation, corrosion, and wear. A coating system consisting of a thermal insulation layer and a ceramic layer with thermal insulation effect. It is of great significance to ensure the long-term service of hot-end components such as gas turbines and engines, and the bonding layer is an important part of the thermal barrier coating of gas turbines, and its performance directly affects the life of the thermal barrier coating system. At present, the composition of the bonding layer is mainly MCrAlY (M=Ni, Co) and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/06C23C4/10C23C4/12C23C14/30C23C14/08C23C4/073C23C4/11C23C4/129C23C4/134
Inventor 陈文夫周新义郭芳威赵晓峰肖平
Owner HENAN PULAIMU COATING TECH
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