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Technology method for preparing thermal barrier coating through high-energy plasma spraying

A high-energy plasma and thermal barrier coating technology, applied in metal material coating process, coating, fusion spraying and other directions, can solve the problems of low spraying efficiency, large porosity, low bonding strength and life, and improve productivity. , The effect of improving the thermal shock resistance life and reducing the production cost

Inactive Publication Date: 2018-02-02
AECC AVIATION POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a process method for preparing thermal barrier coatings by high-energy plasma spraying, which solves the limitation of spraying raw materials by supersonic flame spraying in the preparation of thermal barrier coatings in the prior art and prepares thermal barrier coatings. When coating the ceramic surface layer, the spraying efficiency of the conventional atmospheric plasma process is low, the porosity is large, and the bonding strength and service life are low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In this example, a thermal barrier coating is prepared for the first-stage turbine guide vane of a gas turbine.

[0032] Before spraying, use gasoline or acetone to degrease the surface of the parts, then use a special protective tape for thermal spraying to protect the non-sprayed area, use a 60-mesh press-in type sand blower to roughen the sprayed area, and then remove the protection adhesive tape.

[0033] The parts are supported on the special material and process tooling, and the 200-4 spray gun with Laval structure is supported by the multi-axis manipulator. Here, the tooling is made of chrome-plated high-temperature alloy to protect and strengthen the non-painted area.

[0034] CoCrAlYSi alloy quick-quenching powder is used for the bonding bottom layer, and the powder particle size is 15 μm to 60 μm. The plazjet high-energy plasma spraying equipment is used to spray by setting parameters. During the spraying process, compressed air is used to forcibly cool the p...

Embodiment 2

[0039] In this embodiment, a thermal barrier coating is prepared for a turbine guide vane.

[0040] Before spraying, use gasoline or acetone to degrease the surface of the parts, then use a special protective tape for thermal spraying to protect the non-sprayed area, and use a 60-mesh press-in type sand blasting machine to roughen the sprayed area with a pressure of 0.4 MPa, and then remove the protective tape.

[0041] The parts are supported on the special material and process tooling, and the 200-4 spray gun with Laval structure is supported by the multi-axis manipulator.

[0042] The bonding bottom layer is made of NiCrAlY alloy powder with a particle size of 20 μm to 60 μm. The plazjet high-energy plasma spraying equipment is used to spray by setting parameters. During the spraying process, compressed air is used to cool the parts to keep the temperature of the parts below 200 °C. The set parameters are: the spraying power is 170KW, the spraying distance is 200mm, the po...

Embodiment 3

[0047] In this example, a thermal barrier coating is prepared on the surface of a single crystal substrate.

[0048] Before spraying, use gasoline or acetone to degrease the surface of the part, and then use the laser surface to roughen the surface of the single crystal substrate with appropriate parameters. After roughening, the surface roughness is above 3 μm.

[0049] CoNiCrAlY alloy powder is sprayed by supersonic flame for the bonding bottom layer. The particle size of the powder is 15 μm to 40 μm. It is sprayed by setting parameters. During the spraying process, compressed air is used to cool the parts to keep the temperature of the parts below 100 °C. The set parameters are: 5GPM for kerosene, 950SLPM for oxygen, 180mm for spraying distance, and 40g / min for powder feeding.

[0050] The ceramic surface layer uses a multi-axis manipulator to support a 200-4 spray gun with a Laval structure, and uses plazjet high-energy plasma spraying to spray nanometer 8YSZ powder on the...

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Abstract

The invention discloses a technology method for preparing a thermal barrier coating through high-energy plasma spraying. The technology method comprises the steps that high-energy plasma spraying equipment or supersonic flame spraying equipment is used to spray MCrAlY alloy powder onto the substrate surface to prepare a bonding bottom layer, forcing cooling is conducted on a substrate by using compressed air in the process of spraying, and the substrate temperature is made to be less than 200 DEG C; and 8YSZ powder is sprayed onto the substrate surface which has the prepared bonding bottom layer through the high-energy plasma spraying equipment to prepare a ceramic face layer, forcing cooling is conducted on the substrate by using the compressed air in the process of spraying, and the substrate temperature is made to be less than 300 DEG C. The problems that in the prior art, raw material spraying is limited by using supersonic flame spraying when the thermal barrier coating bonding bottom layer is prepared, the praying efficiency is low when the thermal barrier coating ceramic face layer is prepared by using a conventional atmospheric plasma technology, the porosity is high, and the bonding strength and the service life are low are solved. The technology method can quickly and efficiently prepare the bonding bottom layer and the ceramic face layer with high performance and long service life.

Description

technical field [0001] The invention belongs to the technical field of thermal barrier coatings, in particular to a process method for preparing thermal barrier coatings by high-energy plasma spraying. Background technique [0002] Thermal barrier coatings (Thermal Barrier Coatings, TBCs) have many applications in the aerospace field. Thermal barrier coatings can isolate high-temperature components from high-temperature working environments to reduce the operating temperature of hot-end components, prevent high-temperature corrosion and high-temperature oxidation of substrate components, and prolong their service life. At present, high-pressure turbine working blades, guide vanes, combustion chambers and other parts all use thermal barrier coating technology. [0003] At present, most thermal barrier coatings adopt a double-layer structure, including a bonded bottom layer and a ceramic surface layer. The MCrAlY coating is prepared by APS, HVOF, LPPS or cold spraying for th...

Claims

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Application Information

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IPC IPC(8): C23C4/134C23C4/11C23C4/073
CPCC23C4/134C23C4/073C23C4/11
Inventor 梁小龙王斌利张会盈黄宝庆胡江波王建锋李迎军原红星
Owner AECC AVIATION POWER CO LTD
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