A Method for Improving the High Temperature Oxidation Resistance of Thermal Spray Coatings Using Thermal-Mechanical Composite Effect

A technology of anti-oxidation at high temperature and thermal spraying, applied in the direction of coating, metal material coating process, melt spraying, etc., can solve the problems of coating embrittlement, etc. The effect of high temperature service life

Active Publication Date: 2021-06-22
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the existing Al-enhanced MCrAlY coating technology easily causes excessive Al content in local areas, causing coating embrittlement, and accelerating the failure of the coating during service, and to invent a method to improve thermal spraying by using thermal-mechanical composite effect. A method for coating high temperature oxidation resistance, which can eliminate surface thermal spraying defects, refine surface grains and implanted Al and Al 2 o 3 particle size and alloy it to form a layer rich in Al and Al 2 o 3 The remelted protective layer of nanoparticles eliminates the intrinsic defects in the thermal spraying process and obtains an ideal structure, thereby improving its high temperature oxidation resistance

Method used

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  • A Method for Improving the High Temperature Oxidation Resistance of Thermal Spray Coatings Using Thermal-Mechanical Composite Effect
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Embodiment 1

[0026] Such as Figure 1-2 shown.

[0027]A method for improving the high-temperature oxidation resistance of a thermal sprayed coating by using thermal-mechanical composite effect, the specific steps are as follows:

[0028] 1) After the superalloy substrate (GH4169) has been pre-grinded, cleaned, and roughened by sandblasting, a NiCoCrAlY coating (Cr 23Wt%, Al 13Wt%, Y 0.5Wt%, Co 25Wt% , NiBal.), the thickness is about 160 μm; according to the technical requirements of atmospheric plasma spraying equipment, the voltage is 38 V, the current is 750 A, the powder feeding rate is 6 rpm, the spray gun speed is 450 mm / s, and the spraying distance is 85 mm.

[0029] 2) Select high-purity Al powder (400 mesh) with a purity of 99.9% and Al 2 o 3 Powder (400 mesh), put into the ball mill according to the mass ratio of 3:1, ball mill for 4h under the protection of Ar gas, the ball milling program is set to run for 10min and stop for 10min, and prepare Al and Al 2 o 3 Mixed powder ...

Embodiment 2

[0036] A method for improving the high-temperature oxidation resistance of a thermal sprayed coating by using thermal-mechanical composite effect, the specific steps are as follows:

[0037] 1) After the superalloy substrate (GH4169) has been pre-grinded, cleaned, and roughened by sandblasting, a NiCoCrAlY coating (Cr 23Wt%, Al 13Wt%, Y 0.5Wt%, Co 25Wt% , NiBal.), the thickness is about 140μm; according to the technical requirements of the atmospheric plasma spraying equipment, the voltage is 38 V, the current is 750 A, the powder feeding rate is 2rmp, the spray gun speed is 500 mm / s, and the spraying distance is 100mm.

[0038] 2) Select high-purity Al powder (300 mesh) with a purity of 99.9% and Al 2 o 3 powder (300 mesh), put into ball mill according to the mass ratio of 3:1, and ball mill for 2h under the protection of Ar gas, the ball mill program is set to run for 10min and stop for 10min, to prepare Al and Al 2 o 3 Mixed powder as membrane material;

[0039] 3) Prep...

Embodiment 3

[0045] A method for improving the high-temperature oxidation resistance of a thermal sprayed coating by using thermal-mechanical composite effect, the specific steps are as follows:

[0046] 1) After the superalloy substrate (GH4169) has been pre-grinded, cleaned, and roughened by sandblasting, the NiCoCrAlY coating (Cr 23Wt%, Al 13Wt%, Y 0.5Wt%, Co 25Wt% , NiBal.), the thickness is about 180 μm; according to the technical requirements of the atmospheric plasma spraying equipment, the voltage is 50 V, the current is 900 A, the powder feeding rate is 10 rpm, the spray gun speed is 300 mm / s, and the spraying distance is 70 mm.

[0047] 2) Select high-purity Al powder (300 mesh) with a purity of 99.9% and Al 2 o 3 powder (300 mesh), put into ball mill according to the mass ratio of 3:1, and ball mill for 2h under the protection of Ar gas, the ball mill program is set to run for 10min and stop for 10min, to prepare Al and Al 2 o 3 Mixed powder as membrane material;

[0048] 3)...

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Abstract

A method for improving the high temperature oxidation resistance of thermal sprayed coatings by utilizing thermal-mechanical composite effects, characterized in that a high-performance protective coating is prepared by combining atmospheric plasma spraying, laser shock and pulsed electron beams. Laser-induced ultra-high pressure impact will pre-coated Al and Al on the surface of the protective coating 2 o 3 Particles are embedded on the surface of the coating, and the protective coating after laser shock is irradiated by high-energy pulsed electron beams, and the surface remelting and alloying treatment are realized under thermal-mechanical coupling. The invention can effectively regulate the microscopic morphology and structure of the coating, and realize Al / Al 2 o 3 Combined with the metallurgy of the coating, it can seal and fill the voids and micro-cracks on the coating surface, improve the density of the coating, and refine the grains of the coating. Protective α-Al for late high temperature service environment 2 o 3 The formation and steady-state growth of the oxide film provide good conditions, effectively adjust the growth stress of the oxide film, and improve the high-temperature service life of the coating.

Description

technical field [0001] The invention relates to the technical field of surface modification, in particular to a preparation process of a high-temperature protective coating. Specifically, it is a method for improving the high-temperature oxidation resistance of high-temperature protective coatings by using thermal-mechanical compound effect. Background technique [0002] MCrAlY (M = Fe, Co, Ni or Co+Ni, etc.) high temperature protective coating is a series of coating systems developed in recent years, due to its good adhesion, high modulus, high strength and excellent high temperature oxidation and corrosion resistance, not only can be used as the bonding layer between the substrate and the ceramic surface layer in the thermal barrier coating, but also can be applied to the protective coating of superalloy parts in many high-temperature occasions, and has been widely used in aviation, ships, automobiles, energy, etc. area on the hot end of the engine. At present, the commo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/134C23C4/073C23C24/10C23C4/18
Inventor 李晨蔡杰高承钻李国君祖张坤关庆丰
Owner JIANGSU UNIV
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