Thermal barrier coating with composite double-ceramic-layer structure and preparation method thereof

A technology of thermal barrier coatings and composite ceramics, applied in coatings, metal material coating processes, fusion spraying, etc., can solve problems such as poor resistance to crack growth, failure, safety of hot end components, and service life hazards

Pending Publication Date: 2021-09-14
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the fracture toughness of the top ceramic layer, that is, the new doped modified zirconia ceramic layer is still low, and the resistance to crack propagation is poor, the thermal barrier coating with a double ceramic layer structure is prone to top coating during thermal cycling. Phenomenon of layer cracking and peeling
The cracking and peeling of the top coating will lead to the decline of the overall thermal insulation performance of the coating, accelerate the failure of the coating, and further endanger the safety and service life of the hot end components

Method used

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  • Thermal barrier coating with composite double-ceramic-layer structure and preparation method thereof
  • Thermal barrier coating with composite double-ceramic-layer structure and preparation method thereof
  • Thermal barrier coating with composite double-ceramic-layer structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) Ultrasonic cleaning is performed on the surface of the GH2747 superalloy substrate to remove carbon deposits and oil stains on the surface of the substrate, and the surface of the substrate is roughened by sandblasting.

[0049] (2) Adopting the method of plasma spraying, spraying NiCoCrAlY powder on the surface of the superalloy substrate after sandblasting roughening treatment, forms thermal barrier coating bonding layer;

[0050] The specific parameters of plasma spraying are: the spraying distance is 80mm, the current is 580A, the flow rate of argon gas is 120SCFH, the flow rate of helium gas is 10SCFH, the powder feeding rate is 3rpm, the moving speed of the spray gun is 500mm / s, the thermal barrier coating bonding layer The thickness is 0.11mm;

[0051] (3) adopt the method for plasma spraying, spray nanometer YSZ powder on the bonding layer of thermal barrier coating, form nanometer YSZ ceramic layer;

[0052] The specific parameters of plasma spraying are: ...

Embodiment 2

[0064] (1) Ultrasonic cleaning is performed on the surface of the GH2747 superalloy substrate to remove carbon deposits and oil stains on the surface of the substrate, and the surface of the substrate is roughened by sandblasting.

[0065] (2) Adopting the method of plasma spraying, spraying NiCoCrAlY powder on the surface of the superalloy substrate after sandblasting roughening treatment, forms thermal barrier coating bonding layer;

[0066] The specific parameters of plasma spraying are: the spraying distance is 80mm, the current is 580A, the flow rate of argon gas is 120SCFH, the flow rate of helium gas is 10SCFH, the powder feeding rate is 3rpm, the moving speed of the spray gun is 500mm / s, the thermal barrier coating bonding layer The thickness is 0.12mm;

[0067] (3) adopt the method for plasma spraying, spray nanometer YSZ powder on the bonding layer of thermal barrier coating, form nanometer YSZ ceramic layer;

[0068] The specific parameters of plasma spraying are: ...

Embodiment 3

[0080] (1) Ultrasonic cleaning is performed on the surface of the GH2747 superalloy substrate to remove carbon deposits and oil stains on the surface of the substrate, and the surface of the substrate is roughened by sandblasting.

[0081] (2) Adopting the method of plasma spraying, spraying NiCoCrAlY powder on the surface of the superalloy substrate after sandblasting roughening treatment, forms thermal barrier coating bonding layer;

[0082] The specific parameters of plasma spraying are: the spraying distance is 80mm, the current is 580A, the flow rate of argon gas is 120SCFH, the flow rate of helium gas is 10SCFH, the powder feeding rate is 3rpm, the moving speed of the spray gun is 500mm / s, the thermal barrier coating bonding layer The thickness is 0.13mm;

[0083] (3) adopt the method for plasma spraying, spray nanometer YSZ powder on the bonding layer of thermal barrier coating, form nanometer YSZ ceramic layer;

[0084] The specific parameters of plasma spraying are: ...

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Abstract

The invention relates to a thermal barrier coating with a composite double-ceramic-layer structure and a preparation method thereof, and belongs to the technical field of thermal barrier coating preparation. The thermal barrier coating sequentially comprises a thermal barrier coating bonding layer, a YSZ ceramic layer and a composite ceramic layer from a base body to the top; the composite ceramic layer is composed of a high-toughness ceramic material and a high-rare-earth-content doped zirconium oxide material according to the volume ratio of (1 to 4): (4 to 1); the high-toughness ceramic material is a ceramic material with the fracture toughness being greater than 5MPa. M < 1 / 2 >; and in the high-rare-earth-content doped zirconium oxide material, the sum of the mole fractions of the doped rare earth elements is 16 percent to 30 percent. According to the thermal barrier coating, the thermal barrier coating bonding layer, the YSZ ceramic layer and the composite ceramic layer are sequentially prepared from the base body to the top through a spraying method. The thermal barrier coating can be prevented from cracking in the thermal cycle process, and the service life is long; and cracks are uniformly distributed, the anti-stripping capability is high, and the heat insulation performance is high.

Description

technical field [0001] The invention relates to a thermal barrier coating with a composite double ceramic layer structure and a preparation method thereof, belonging to the technical field of thermal barrier coating preparation. Background technique [0002] Thermal barrier coatings can increase the operating temperature of hot-end components of turbine engines and gas turbines, and are one of the indispensable key technologies for advanced aero-engines and gas turbines. Currently the most widely used thermal barrier coating material is yttria partially stabilized zirconia, (wherein, Y 2 o 3 The mole fraction is 3% to 4%, referred to as: YSZ). The advantages of YSZ are high thermal expansion coefficient, low thermal conductivity and low elastic modulus. However, as the engine develops towards a high thrust-to-weight ratio and the inlet temperature continues to increase, the YSZ coating cannot meet the requirements of use. For example, a first-stage engine with a thrust-t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/11C23C4/073
CPCC23C4/134C23C4/11C23C4/073
Inventor 王全胜陈东宁先进李鲲
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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