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Thermal barrier coating and preparation method thereof

A thermal barrier coating, thermal barrier technology, applied in the direction of coating, metal material coating process, melt spraying, etc., can solve the problems of peeling, coating cracking, coating life reduction, etc., to eliminate holes, refine grains, the effect of reducing thermal conductivity

Inactive Publication Date: 2018-04-20
江苏华友装饰工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention: for ZrO under high temperature 2 Allotropic transformation, phase change causes volume change to generate structural stress, resulting in cracking or peeling of the coating, and reduced coating life. Provides a thermal barrier coating and a preparation method thereof

Method used

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  • Thermal barrier coating and preparation method thereof

Examples

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Effect test

example 1

[0023] Take samarium nitrate, gadolinium nitrate, ytterbium nitrate, cerium nitrate, and zirconium nitrate, mix them in deionized water at a molar ratio of 5:3:2:0.1:9.0, stir at 300r / min for 20min, then add ammonia water dropwise at 1mL / min to No precipitation occurs, filter the filter residue after standing for 1 hour, wash the filter residue with deionized water until the washing liquid is neutral, and obtain a precursor, place the precursor in a drying oven, dry at 105°C to constant weight, and then transfer to In a muffle furnace, calcined at 1000°C for 1 hour, cooled to room temperature, put it into a grinder and ground it for 1 hour to obtain thermal barrier ceramic powder, cut nickel-based superalloy K417 into a cylinder of Φ20mm×5mm, and ultrasonicated with kerosene and alcohol Clean twice, then sandblast the surface with corundum grit, control the average particle size of the grit to 200μm, and the blasting pressure to 1.5×10 5 Pa, the sandblasting angle is 45°, the ...

example 2

[0025] Take samarium nitrate, gadolinium nitrate, ytterbium nitrate, cerium nitrate, and zirconium nitrate, mix them in deionized water at a molar ratio of 5:3:2:0.5:9.5, stir at 350r / min for 25min, then add ammonia water dropwise at 1mL / min to No precipitation occurs, filter residue after standing for 1 hour, wash the filter residue with deionized water until the washing liquid is neutral, and obtain a precursor, place the precursor in a drying oven, dry at 107°C to constant weight, and then transfer to In a muffle furnace, calcined at 1100°C for 2 hours, cooled to room temperature, put it into a grinder and ground it for 1 hour to obtain thermal barrier ceramic powder, cut nickel-based superalloy K417 into a cylinder of Φ20mm×5mm, and ultrasonicated with kerosene and alcohol Clean twice, and then sandblast the surface with corundum grit, control the average particle size of the grit to 210μm, and the blasting pressure to 1.5×10 5 Pa, the sandblasting angle is 52°, the sandblas...

example 3

[0027] Take samarium nitrate, gadolinium nitrate, ytterbium nitrate, cerium nitrate, zirconium nitrate, mix them in deionized water at a molar ratio of 5:3:2:1:9.9, stir at 400r / min for 30min, then add ammonia water dropwise at 2mL / min to No precipitation occurs, filter the filter residue after standing for 2 hours, wash the filter residue with deionized water until the washing liquid is neutral, and obtain a precursor, place the precursor in a drying oven, dry at 110°C to constant weight, and then transfer to In a muffle furnace, calcined at 1200°C for 3 hours, cooled to room temperature, put it into a grinder and ground it for 2 hours to obtain thermal barrier ceramic powder, cut nickel-based superalloy K417 into a cylinder of Φ20mm×5mm, and ultrasonicated with kerosene and alcohol After cleaning for 3 times, the surface is sandblasted with corundum grit, the average particle size of the grit is controlled to be 220 μm, and the blasting pressure is 1.5×10 5 Pa, the sandblast...

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Abstract

The invention relates to a thermal barrier coating and a preparation method thereof, and belongs to the technical field of ceramic composite materials. The preparation method of the thermal barrier coating includes the steps that a layer of Dy-doped NiCoCrAlYTa is sprayed to a substrate surface with a low pressure plasma spraying technology, the interface bonding force of a oxidation film is improved through Dy doping, holes of the oxidation film / a coating interface are effectively removed, and grains are refined; distributing conditions of different phases in the coating are changed, the function of cyclic oxidation resistance of the coating is significantly improved, and tack coat is polished to mirror surface simultaneously to be capable of lowering growth rate of oxide; and the polishing treatment to the tack coat can still prevent producing and extending of microcracks of a ceramic layer / the oxide / tack coat and the interior of the ceramic layer, the ceramic layer is made of thermal barrier ceramic powder doped with rare earth oxide in a spraying mode, the heat conductivity of the coating is drastically reduced, and the service life in the heat cycle is prolonged.

Description

technical field [0001] The invention relates to a thermal barrier coating and a preparation method thereof, belonging to the technical field of heat insulation. Background technique [0002] With the development of aero-engines toward high thrust-to-weight ratios, the operating temperature of the combustion chamber continues to increase. For example, the gas temperature of military aircraft is as high as 1600 ° C, while the maximum operating temperature of nickel-based superalloys used to manufacture turbine blades is only 1100 ° C. It cannot meet the requirements of modern aero-engines. Based on this, in addition to improving the cooling structure system, the preparation of thermal barrier coatings on the surface of superalloys has become an efficient and fast method. Thermal barrier coatings generally consist of high thermal insulation, corrosion-resistant ceramic coatings and metal bonding layers. The main function of the ceramic coating is to reduce the transfer of hea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/11C23C4/073C23C4/134C23C4/137
CPCC23C4/11C23C4/073C23C4/134C23C4/137
Inventor 王国峰王文新史玉兰
Owner 江苏华友装饰工程有限公司
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