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Wear-resistant coating with multi-level island structure and preparation method thereof

A wear-resistant coating and coating technology, applied in the field of multi-level reinforced wear-resistant coating material structure and preparation, can solve the problems of brittleness and insufficient toughness of wear-resistant coatings, and improve corrosion resistance and physical phase matching. The effect of high and low friction coefficient

Active Publication Date: 2022-04-19
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the technical problem of brittleness caused by insufficient toughness of the existing wear-resistant coating, the invention provides a wear-resistant coating with a TiAl-based multi-level island structure and a preparation method

Method used

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  • Wear-resistant coating with multi-level island structure and preparation method thereof
  • Wear-resistant coating with multi-level island structure and preparation method thereof
  • Wear-resistant coating with multi-level island structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Step 1: Powder Preparation

[0038] Mix Al powder, Ti powder, TiC powder, Mo powder four kinds of powders into original powder, the powder ratio is: Al:Ti:TiC:Mo=9:9:2:2 (molar ratio);

[0039] Step 2: Substrate surface pretreatment

[0040] The first is to soak the workpiece in acid solution, the soaking time is determined according to the degree of dirt on the workpiece, and rinse with water after acid leaching. Then soak it in alkaline water to neutralize the residual acid, and finally wash it thoroughly with warm water and dry it. Then use the conventional sandblasting roughening method to roughen the surface of the workpiece.

[0041] Step 3: Plasma spraying and laser remelting

[0042] Put the powder mixed in step 1 into an oven and dry it at 50°C for 2 hours, then conduct plasma spraying. The process parameters are: voltage 50V, current 150A, spraying distance 100mm, powder feeding rate 50g / min, thickness 1.0 mm; put the sprayed workpiece on the workbench to ...

Embodiment 2

[0047] Step 1: Powder Preparation

[0048] Mix Al powder, Ti powder, TiC powder, and Nb powder into the original powder. The powder ratio is: Al:Ti:TiC:Nb=9:9:2:2 (molar ratio), that is, Nb Instead of Mo in Example 1, the proportioning remains unchanged;

[0049] Step 2: Substrate surface pretreatment

[0050] The first is to soak the workpiece in acid solution, the soaking time is determined according to the degree of dirt on the workpiece, and rinse with water after acid leaching. Then soak it in alkaline water to neutralize the residual acid, and finally wash it thoroughly with warm water and dry it. Then use the conventional sandblasting roughening method to roughen the surface of the workpiece.

[0051] Step 3: Plasma spraying and laser remelting

[0052] Put the powder mixed in step 1 into an oven and dry it at 50°C for 2 hours, then conduct plasma spraying. The plasma spraying process parameters are: voltage 50V, current 150A, spraying distance 80mm, powder feeding ...

Embodiment 3

[0057] Step 1: Powder Preparation

[0058] Mix Al powder, Ti powder, TiC powder and Cr powder into the original powder. The powder ratio is: Al:Ti:TiC:Cr=9:9:2:2 (molar ratio). Instead of Mo in Example 1, the proportioning remains unchanged;

[0059] Step 2: Substrate surface pretreatment

[0060] The first is to soak the workpiece in acid solution, the soaking time is determined according to the degree of dirt on the workpiece, and rinse with water after acid leaching. Then soak it in alkaline water to neutralize the residual acid, and finally wash it thoroughly with warm water and dry it. Then use the conventional sandblasting roughening method to roughen the surface of the workpiece.

[0061] Step 3: Plasma spraying and laser remelting

[0062] The plasma spraying process parameters are: voltage 50V, current 150A, spraying distance 55mm, powder feeding rate 45g / min, thickness 2mm; cladding power: 1500W, cladding rate: 8mm / s, the average microscopic The hardness is 450H...

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Abstract

The invention discloses a wear-resistant coating with a multi-level island structure and a preparation method thereof. The powder is firstly sprayed on the surface of a pretreated substrate, and then the remelt-sprayed coating is clad by laser, and then the pre-coated powder is sequentially added. The powder content that can generate ceramic phase is laser cladding until the hardness, toughness or ductility of the coating meets the design requirements, thus forming a multi-level island structure with a gradient increase in the content of the ceramic strengthening phase from the TiAl matrix to the coating surface. Composite cladding layer. The ceramic phase of the present invention increases gradually from the inside to the outside, ensuring that the cladding layer has high hardness and wear resistance, and at the same time avoids the decrease in toughness caused by sudden changes in composition, structure and performance, and can obtain a coating with high wear resistance and high strength. Layer, suitable for parts that are subjected to bending, tensile, and impact loads during work.

Description

technical field [0001] The invention relates to a multi-stage reinforced wear-resistant coating material structure and preparation technology, belonging to the field of metal material surface treatment. Specifically, it discloses a method of using laser cladding to efficiently obtain an intermetallic compound / ceramic composite coating with a multi-level island structure and the method, which greatly improves the wear resistance of the surface and prolongs the service life. Background technique [0002] Key components such as high-speed rail brake discs, metallurgical rolls, and glass embossing rolls work in complex and harsh wear environments. Because the wear resistance of the workpiece surface does not meet the requirements, the service life is greatly shortened, which brings safety hazards , has also become the most consuming wearing part. At present, the commonly used methods to improve surface properties are: laser and plasma cladding, surfacing welding, bimetal compos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C28/02C22C30/00C22C32/00C23C4/06C23C4/134C23C24/10C23C4/02C23C4/18
CPCC23C28/027C23C24/103C22C30/00C22C32/00C23C4/134C23C4/06C23C4/02C23C4/18
Inventor 崔洪芝宋晓杰满成崔中雨李燚周徐正姜迪
Owner OCEAN UNIV OF CHINA