Method for preparing composite coating through electromagnetic induction heating

A technology of electromagnetic induction heating and composite coating, applied in coating, metal material coating process, fusion spraying and other directions, can solve the problems of coating peeling, warping deformation, cracking, etc. strong knot effect

Inactive Publication Date: 2016-08-03
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0010] The problem to be solved by the present invention is: to overcome the problems that the internal stress in the spraying process is too large and the coating will fall off and crack during use
[0011] The purpose and significance of the present invention is to use cost-effective technology to solve the problems of stress accumulation and release in the spraying process and the coating peeling off, cracking, warping deformation and even damage to the container caused by the difference in thermal expansion coefficient, so as to make the coating more firmly bonded , longer service life

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  • Method for preparing composite coating through electromagnetic induction heating
  • Method for preparing composite coating through electromagnetic induction heating
  • Method for preparing composite coating through electromagnetic induction heating

Examples

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preparation example Construction

[0049] Specific embodiments of the present invention prepare the preparation scheme of multilayer coating as follows, specifically comprise the following steps:

[0050] (1) First use white corundum, brown corundum or zirconium corundum (the particle size of the sand is 18-25μm) to sandblast the substrate; after spraying, use compressed dry air to blow off the remaining sand and impurities in the pits on the surface of the substrate .

[0051] (2) Using the thermal spraying system, put the substrate to be sprayed on the spraying platform of the spraying system, make preparations before spraying, and spray.

[0052] (3) Carry out mechanical processing and treatment of the coating surface according to the requirements to meet the corresponding use requirements.

[0053] (4) Spray the protective layer and decorative layer on the surface of the coating according to the requirements of use, cool to room temperature, and remove the sample.

[0054] There are 2 methods of physicall...

Embodiment 1

[0058] In this embodiment, the aluminum alloy is used as the base, and the 316L stainless steel coating is sprayed on the aluminum alloy base. Plate (the material is high temperature resistant molybdenum wire, the thickness of molybdenum wire is 0.1mm), the shape of the mesh plate is honeycomb, and the area of ​​each honeycomb is 0.01mm 2 . Thermal spraying is carried out by arc spraying technology, the distance between the grid and the surface to be sprayed is 4mm, the spray voltage is 32V, the current is 180A and the spray pressure is 0.6MPa, the distance between the spray gun and the grid is 200mm, and the spraying speed is 6mm / s. The distributed electromagnetic induction heating composite coating has a thickness of about 100 μm.

[0059] The coating prepared in this embodiment is distributed in a honeycomb shape, and the area of ​​each grid is 0.01mm 2 , the distance between the grids is 0.1mm. Microhardness tester MC010-HVS-1000Z coating was used for hardness test, and...

Embodiment 2

[0063] In this embodiment, the aluminum alloy is used as the substrate, and the Ni-Al coating is sprayed on the aluminum alloy substrate. The specific method is: after the surface of the aluminum alloy substrate is roughened and cleaned, the surface to be sprayed is hollowed out Stencil (the material is high temperature resistant chrome wire, the thickness of chrome wire is 10mm), the shape of the stencil is grid, and the area of ​​each grid is 10000mm 2 . Plasma spraying is used for thermal spraying, the distance between the grid and the surface to be sprayed is 4mm, and the distance between the spray gun and the grid is 200mm; current 410A; voltage 320V; N 2 Flow 230L / min; Ar flow 100L / min; H 2 The flow rate is 15L / min; the powder feeding voltage is 18V, the moving speed of the spray gun is 6mm / s, and the thickness of the prepared coating is about 700μm.

[0064] The coating prepared in this example is distributed in a grid shape, and the area of ​​each grid shape is 10000...

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Abstract

The invention discloses a method for preparing a composite coating through electromagnetic induction heating, and belongs to the technical field of electromagnetic induction heating. The method comprises specific steps that a base body surface is subject to roughening and cleaning treatment, a to-be-sprayed surface of a base body is covered with or pasted with a hollow-out screen, thermal spraying is carried out, and after the screen is removed, an electromagnetic induction heating composite coating evenly divided by grooves is obtained; or the base body surface is directly subject to thermal spraying, then, mechanical cutting is carried out, and the electromagnetic induction heating composite coating which is evenly divided by the grooves is obtained; the thermal spraying coating is separated into a plurality of electromagnetic induction heat source coating blocks, the base body is more evenly heated, and stress is more dispersed; and after dividing is carried out, even if the part of a heating layer falls off or is damaged, continuous using of other parts of coating and a whole product is not affected, and a repairing technology is simple.

Description

technical field [0001] The invention belongs to the field of preparation of electromagnetic induction heating composite coatings, and relates to physically dividing and releasing the internal stress of composite induction heating coatings, so as to improve the bonding strength and service performance of electromagnetic induction heating, protection and decoration coatings. Background technique [0002] Electromagnetic induction heating avoids the use of open flame heating, and has the advantages of environmental protection, energy saving, high efficiency, easy realization of automatic temperature control and automatic control of heating parts, etc. The use of thermal spraying technology to prepare magnetically permeable coatings on the surface of non-magnetic substrates has a good application prospect for electromagnetic induction heating of non-magnetic substrates. However, electromagnetic induction heating coatings prepared on the surface of magnetic substrates are prone to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/12C23C4/18C23C4/02
CPCC23C4/12C23C4/18
Inventor 宋鹏李乔磊罗恒彭俊铭
Owner KUNMING UNIV OF SCI & TECH
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