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Self-healing coating for improving surface quality and preparation method thereof

A surface quality, self-healing technology, applied in the coating, metal material coating process, fusion spraying, etc., can solve the problems of reducing the mechanical properties of the base material, poor corrosion resistance of the coating, and damage to the coating surface, etc., to achieve Realize the crack gradient healing effect, enhance the bonding strength, and improve the overall performance

Inactive Publication Date: 2022-06-24
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Therefore, the technical problem to be solved in the present invention is to overcome the defects in the prior art that the coating has poor corrosion resistance, low surface quality, the coating reduces the mechanical properties of the base material, and the laser remelting process easily causes coating surface damage, thereby providing A self-healing coating for improving surface quality and its preparation method, using NiCrAlY, TiC, Al 2 o 3 -13%TiO 2 As a coating material, a gradient coating is formed by plasma spraying, and then the coating is metallurgically bonded by laser remelting

Method used

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  • Self-healing coating for improving surface quality and preparation method thereof
  • Self-healing coating for improving surface quality and preparation method thereof
  • Self-healing coating for improving surface quality and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0047] (1) Surface mechanical polishing: The hot-rolled austenitic stainless steel samples are polished with sandpapers of different particle sizes (80#~1200#) until there are no obvious scratches visible to the naked eye, and then cleaned with acetone for 5~20min in ultrasonic waves to remove oil , ultrasonic cleaning with absolute ethanol for 5 to 20 minutes, remove stains, and finally put it in a drying oven at 80 ° C for drying for 20 to 40 minutes; (among which 321 austenitic stainless steel is a rolled sheet, and the mass fraction of its chemical composition is C 0.04%, Si 0.38 %, Mn 1.08%, Cr 17.02%, Ni9.06%, N 0.05%, P 0.03%, Ti 0.22%, the rest is Fe. The mechanical properties of 321 stainless steel at room temperature are: tensile strength (σb) 667MPa, yield strength (σ0.2) 245MPa, elongation 56.5%, hardness 175HV.) The chromium hardness of the base metal should be less than 40, and if the hardness is too high, it is not conducive to the bonding between the coating and...

Embodiment 2

[0055] (1) Surface mechanical polishing: The hot-rolled austenitic stainless steel samples are polished with sandpapers of different particle sizes (80#~1200#) until there are no obvious scratches visible to the naked eye, and then cleaned with acetone for 5~20min in ultrasonic waves to remove oil , ultrasonic cleaning with absolute ethanol for 5 to 20 minutes, remove stains, and finally put it in a drying oven at 80 ° C for drying for 20 to 40 minutes; (among which 321 austenitic stainless steel is a rolled sheet, and the mass fraction of its chemical composition is C 0.04%, Si 0.38 %, Mn 1.08%, Cr17.02%, Ni9.06%, N 0.05%, P 0.03%, Ti 0.22%, the rest is Fe. The mechanical properties of 321 stainless steel at room temperature are: tensile strength (σb) 667MPa, yield Strength (σ0.2) 245MPa, elongation 56.5%, hardness 175HV.) The chromium hardness of the base metal should be less than 40, and if the hardness is too high, it is not conducive to the bonding between the coating and ...

Embodiment 3

[0063] (1) Surface mechanical polishing: The hot-rolled austenitic stainless steel samples are polished with sandpapers of different particle sizes (80#~1200#) until there are no obvious scratches visible to the naked eye, and then cleaned with acetone for 5~20min in ultrasonic waves to remove oil , ultrasonic cleaning with absolute ethanol for 5 to 20 minutes, remove stains, and finally put it in a drying oven at 80 ° C for drying for 20 to 40 minutes; (among which 321 austenitic stainless steel is a rolled sheet, and the mass fraction of its chemical composition is C 0.04%, Si 0.38 %, Mn 1.08%, Cr17.02%, Ni9.06%, N 0.05%, P 0.03%, Ti 0.22%, the rest is Fe. The mechanical properties of 321 stainless steel at room temperature are: tensile strength (σb) 667MPa, yield Strength (σ0.2) 245MPa, elongation 56.5%, hardness 175HV.) The chromium hardness of the base metal should be less than 40, and if the hardness is too high, it is not conducive to the bonding between the coating and ...

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Abstract

The invention discloses a self-healing coating for improving surface quality and a preparation method of the self-healing coating, and belongs to the technical field of metal material protective coatings. The coating is sprayed on a base body in a plasma spraying mode, and the coating sequentially comprises a NiCrAlY bonding layer with the thickness of 40-60 microns, a NiCrAlY + TiC self-healing layer with the thickness of 40-60 microns, a NiCrAlY + AT13 ceramic environment barrier layer with the thickness of 60-80 microns and a laser remelting layer with the thickness of 40-60 microns from inside to outside. The mass ratio of NiCrAlY to TiC in the self-healing layer is 1: 1; the mass ratio of NiCrAlY to AT13 in the environment barrier layer is 1: 3; and the laser remelting layer is obtained by carrying out laser remelting treatment on the ceramic environment barrier layer. Through the synergistic effect of component design and the plasma spraying and laser remelting technology, the surface quality of the coating is improved, the coating has good mechanical performance, and the mechanical performance of a base body is not reduced.

Description

technical field [0001] The invention relates to the technical field of protective coatings for metal materials, in particular to a self-healing coating with improved surface quality and a preparation method thereof. Background technique [0002] supercritical carbon dioxide (S-CO 2 ) Brayton cycle technology has the advantages of high cycle efficiency and compact structure, which can reduce the investment cost of large-scale power stations, and is a new way to achieve high-efficiency and clean coal power generation. Due to supercritical CO 2 Brayton cycle is used in high temperature and high pressure (28MPa / 620℃ or higher) conditions, and its corrosion to the valve material heat-resistant steel is still unavoidable. Heat-resistant steel in the face of S-CO 2 At the same time of corrosion, under the load of high temperature stress cycle for a long time, due to the influence of environmental-fatigue factors, micro-cracks are easy to initiate from the surface, grow at high t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/073C23C4/06C23C4/02C23C4/18
CPCC23C4/134C23C4/073C23C4/06C23C4/02C23C4/18
Inventor 李微覃厚军余昌科黄伟颖吴泽林李聪任延杰周立波陈荐陈建林李磊张英哲廖力达陈安琪
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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