Self-healing coating for improving interlayer bonding energy and preparation method thereof

A self-healing and binding energy technology, used in coatings, metal material coating processes, melt spraying, etc., can solve the problems of high porosity, unevenness, high energy consumption, and improve binding energy and surface morphology. , the effect of low porosity

Pending Publication Date: 2022-07-01
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the multilayer structure coating formed by plasma spraying has the following two disadvantages: (1) The coating formed by thermal spraying is loose, mechanically bonded, and has high porosity. (2) The chemical composition and crystal structure of sprayed materials are often in a non-equilibrium state, and the coating has a typical layered structure, resulting in inhomogeneity
The former is usually carried out after all coatings are sprayed, it is not easy to achieve metallurgical bonding between the sub-layers in the coating, and the structure of the coating will be destroyed under high power
The latter has high energy consumption and is not suitable for mass production

Method used

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  • Self-healing coating for improving interlayer bonding energy and preparation method thereof
  • Self-healing coating for improving interlayer bonding energy and preparation method thereof
  • Self-healing coating for improving interlayer bonding energy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] (1) Surface mechanical polishing: The hot-rolled austenitic stainless steel samples are polished with different grain sizes (80#~1200#) sandpaper 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 5~20min, remove stains, and finally put it in a drying oven at 80°C for drying for 20~40min; (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%, Ni 9.06%, 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 the base surface duri...

Embodiment 2

[0059](1) Surface mechanical polishing: The hot-rolled austenitic stainless steel samples are polished with different grain sizes (80#~1200#) sandpaper 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 5~20min, remove stains, and finally put it in a drying oven at 80°C for drying for 20~40min; (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%, Ni 9.06%, 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 the base surface durin...

Embodiment 3

[0067] (1) Surface mechanical polishing: The hot-rolled austenitic stainless steel samples are polished with different grain sizes (80#~1200#) sandpaper 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 5~20min, remove stains, and finally put it in a drying oven at 80°C for drying for 20~40min; (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%, Ni 9.06%, 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 the base surface duri...

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Abstract

The invention discloses a self-healing coating capable of improving interlayer bonding energy and a preparation method of the self-healing coating, and belongs to the technical field of metal material protection. 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 50 micrometers, a NiCrAlY + TiC self-healing middle layer with the thickness of 40-60 micrometers and an AT13 ceramic environment barrier layer with the thickness of 100-120 micrometers from inside to outside. Wherein the mass ratio of NiCrAlY to TiC in the self-healing middle layer is 1: 5; the preparation method comprises the following steps: after the self-healing intermediate layer is subjected to laser remelting treatment, spraying the AT13 ceramic environment barrier layer; and then carrying out heat treatment to obtain the NiCrAlY / TiC / AT13 self-healing coating. Through the synergistic effect of component design and the plasma spraying and laser remelting technology, the interlayer bonding energy between coatings is improved, good mechanical performance is achieved, 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 interlayer binding energy and a preparation method thereof. Background technique [0002] Deposition of ceramic coatings on metal substrates combines the advantages of ceramic materials and metal substrate materials to obtain an ideal composite coating material, which has been applied in many fields. Due to the different physical property parameters of the metal material substrate and the ceramic coating material, the preparation and work of the ceramic coating may generate large internal stress; and the ceramic coating prepared by simply using the spraying technology, the ceramic coating is different from that of the ceramic coating. The bonding of matrix materials is mainly mechanical bonding, and the coating has a layered structure with poor compactness. There are often a large number of pores in the ceramic ...

Claims

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Application Information

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IPC IPC(8): C23C4/073C23C4/134C23C4/06C23C4/10C23C4/18
CPCC23C4/073C23C4/134C23C4/06C23C4/10C23C4/18
Inventor 李微闫瑞余昌科周立波任延杰陈建林黄伟颖李聪陈荐李磊张英哲廖力达陈安琪吴泽林
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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