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Protective coating for molten sediment on surface of thermal barrier coating and preparation method thereof

A technology of protective coating and thermal barrier coating, which is applied in coating, fusion spraying, metal material coating process, etc., can solve the heat insulation effect and mechanical property attenuation of the coating, increase the internal thermal stress of the coating, 8YSZ Accelerated sintering and other issues to achieve the effect of meeting protection requirements, increasing melting point, and high production efficiency

Inactive Publication Date: 2016-12-07
CHINESE ACAD OF AGRI MECHANIZATION SCI +1
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  • Summary
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  • Application Information

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Problems solved by technology

The basic components of CMAS are molten compounds of dust, minerals, and volcanic ash in the atmosphere and impurities such as Na, Ca, S, P, and K in fuel oil, which have a relatively low melting point (1230-1250°C), and are used in thermal barrier coatings During the process, it will be fused and deposited on the surface of the thermal barrier coating, and at the same time, it will penetrate into the interior of the coating along the surface defects of the ceramic coating (pores and microcracks, columnar grain gaps, etc.), and even more microscopic grain boundaries, and deposit on the coating surface CMAS deposits will increase the internal thermal stress of the coating, and the penetration of CMAS into the coating will lead to accelerated sintering and pore closure of the ceramic coating, and the thermal insulation effect and mechanical properties of the coating will be significantly attenuated; at the same time, SiO in CMAS 2 Will dissolve the Y in 8YSZ 2 o 3 , leading to a decrease in its high-temperature stability and premature phase transition instability; at the same time, due to the Ca in CMAS 2+ Diffusion into YSZ grains will lead to accelerated sintering of 8YSZ, and CaO will replace Y 2 o 3 as ZrO 2 Stabilizer, which will lead to premature phase transition destabilization of 8YSZ material with excellent high temperature stability, the impact of the above CMAS on 8YSZ thermal barrier coating will lead to premature failure of the coating, and the service life of the coating will be significantly reduced

Method used

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  • Protective coating for molten sediment on surface of thermal barrier coating and preparation method thereof
  • Protective coating for molten sediment on surface of thermal barrier coating and preparation method thereof
  • Protective coating for molten sediment on surface of thermal barrier coating and preparation method thereof

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preparation example Construction

[0056] The preparation method of the fused deposit protective coating on the surface of the thermal barrier coating of the present invention, wherein the thermal barrier coating is attached to the surface of the superalloy substrate, and the thermal barrier coating includes at least one bonding layer and at least one ceramic layer, The bonding layer is coated on the surface of the superalloy substrate, the ceramic layer is coated on the surface of the bonding layer, and the ceramic layer in contact with the bonding layer is a partially stabilized zirconia material based on yttria layer, the surface of the ceramic layer is also coated with a protective coating, and the preparation of the protective coating comprises the following steps:

[0057] Step S100, alumina-based spray powder drying treatment, the alumina-based spray powder with a particle size range of 45 μm-75 μm, 15 μm-45 μm or 5 μm-25 μm is dried in an oven at a low temperature, and the alumina-based spray powder shou...

Embodiment 1

[0077] Protective coatings were prepared on conventional atmospheric plasma sprayed thermal barrier coatings.

[0078] Step S100: drying the smelted and crushed alumina-based powder with a purity of 99.5% and a particle size range of 5-25 μm in an oven at 100° C. for 2 hours, and the sprayed powder contains 5 mol% Gd 2 o 3 (gadolinium oxide);

[0079] Step S200: The workpiece of a certain type of gas turbine DZ40M alloy blade surface is supersonic flame sprayed to prepare a NiCrAlY metal bonding layer, and the conventional atmospheric plasma spray is used to prepare a nano-8YSZ thermal barrier coating into the rotary tooling, and the supersonic plasma spraying equipment is turned on, and Adjust the device parameters as follows:

[0080] Voltage: 150V;

[0081] Current: 420A;

[0082] Main gas (argon): 90L / min;

[0083] Secondary gas (hydrogen): 9L / min;

[0084] Carrier gas flow: 6.5L / min;

[0085] Powder feeding volume: 10g / min;

[0086] Spray gun swing rate: 500mm / s. ...

Embodiment 2

[0092] Protective coatings were prepared on conventional atmospheric plasma sprayed thermal barrier coatings.

[0093] Step S100: Drying the smelted and crushed alumina-based powder with a purity of 99.9% and a particle size range of 45-75 μm in an oven at 100° C. for 2 hours, and the sprayed powder contains 1.5 mol% Y 2 o 3 (gadolinium oxide);

[0094] Step S200: the surface of the K403 alloy sample with a size of φ30×3mm was prepared by supersonic flame spraying to prepare a NiCoCrAlY metal bonding layer (thickness 0.1mm), and conventional atmospheric plasma spraying was used to prepare a sample of a nanometer 8YSZ thermal barrier coating (thickness 0.3mm), And turn on the supersonic plasma spraying equipment, and adjust the equipment parameters as follows:

[0095] Voltage: 155V;

[0096] Current: 400A;

[0097] Main gas (argon): 80L / min;

[0098] Secondary gas (hydrogen): 9.5L / min;

[0099] Carrier gas flow: 7.5L / min;

[0100] Powder feeding volume: 20g / min;

[010...

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Abstract

The invention discloses a protective coating for molten sediment on the surface of a thermal barrier coating and a preparation method thereof. The thermal barrier coating comprises at least one bonding layer and at least one ceramic layer, the surface of a high-temperature alloy matrix is coated with the bonding layers, and the surfaces of the bonding layers are coated with the ceramic layers. The ceramic layers making contact with the bonding layers are yttrium-oxide-based partially stabilized zirconium oxide layers. The surfaces of the ceramic layers are further coated with the protective coating. The protective coating is prepared from aluminum-oxide-based spraying powder through a supersonic-speed plasma spraying technique. The preparation method of the protective coating includes the steps of drying of the aluminum-oxide-based spraying powder, workpiece clamping, parameter adjustment, even preheating of the surface of the thermal barrier coating through plasma flames generated by a spray gun of ultrasonic-speed plasma spraying equipment, starting of powder feeding, and forming of the protective coating by spraying the aluminum-oxide-based spraying powder to the surface of the thermal barrier coating one to three times.

Description

technical field [0001] The invention relates to a thermal barrier coating surface fused deposit protective coating and a preparation method thereof, in particular to a thermal barrier coating for preparing a dense and thin alumina-based protective coating by utilizing a high-energy, high-speed supersonic plasma spraying process Surface fused deposit protective coating and preparation method thereof. Background technique [0002] Thermal Barrier Coating (TBC) is a high-temperature structural material surface protection technology that uses the excellent high temperature resistance, heat insulation and corrosion resistance of ceramic materials to composite ceramic and metal matrix in the form of coating. It is composed of a ceramic surface layer with low thermal conductivity and a metal bonding layer with good thermal expansion coefficient matching with the metal matrix and the ceramic surface layer. The use of thermal barrier coating will significantly increase the working t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/12C23C4/10
Inventor 何箐邹晗吴鹏吕玉芬汪瑞军
Owner CHINESE ACAD OF AGRI MECHANIZATION SCI
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