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Method for improving fatigue strength of coating layer by double-layer texture coupling effect

A fatigue strength and texture technology, applied in the direction of pressure inorganic powder coating, etc., can solve the problems of reduced life, high porosity, crack propagation of spray coating, etc., and achieve the effect of prolonging service performance.

Inactive Publication Date: 2017-05-10
ACADEMY OF ARMORED FORCES ENG PLA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the relatively high porosity of the sprayed coating itself, there are defects such as inclusions and fiber cracks, which make the sprayed coating easy to form cracks and expand during service, resulting in reduced service life
[0004] Texturing has been widely used in the research of anti-friction and anti-wear, and the performance of materials has been greatly improved through the method of texturing. The main reason why texturing can improve the tribological properties of materials is that it can Store wear debris and lubricating oil to provide continuous lubrication to the friction surface, but there are few studies on texturing sprayed coatings, using textured different shapes to change contact conditions and then improving the fatigue resistance of sprayed coatings

Method used

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  • Method for improving fatigue strength of coating layer by double-layer texture coupling effect
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  • Method for improving fatigue strength of coating layer by double-layer texture coupling effect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1 Preparation of a double-layer texture-coupled coating

[0030] first step:

[0031] Firstly, the substrate is cleaned and polished, and the substrate is preferably stainless steel, specifically FV520B.

[0032] Step two:

[0033] Fabrication of Textured Patterns on Substrate Surfaces Using a Laser Process

[0034] First, make circular and triangular combined textures, circular and grooved combined textures, grid textures, and hexagonal texture patterns in the drawing software, and then use laser processing to prepare textures on the surface of the substrate pattern.

[0035] Among them, the circular and triangular combined texture, the diameter of the circle is 150 microns, the distance between the centers of the circles is 200 microns, and a triangle with a side length of 100 microns is prepared in the gap between the circles and the circles;

[0036] Circular and groove-shaped combined texture, wherein the grooves have a width angle of 150 microns and a ...

Embodiment 3

[0054] Example 3 The rolling contact fatigue test was carried out on the coating prepared in Example 1, and the slip rate of contact fatigue was changed to observe the anti-fatigue performance of the coating under different slip rate conditions.

[0055]In order to measure various properties of the coating, a Nova NanoSEM450 scanning electron microscope was used to observe the geometric shape of the texture after spraying.

[0056] In order to test the effect of different texture patterns on the fatigue resistance of sprayed coatings, the rolling contact fatigue testing machine was used to test the fatigue properties of sprayed coatings.

[0057] 1. The bonding strength between the coating and the substrate under different shapes and textures on the surface of the substrate

[0058] The bonding strength of the coating is tested by a tensile testing machine, the model of the tensile testing machine used is: MTS809 electronic universal material testing machine. The manufacturer...

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Abstract

The invention provides a method for improving fatigue strength of a coating layer by a double-layer texture coupling effect; and the method prepares texture patterns on the surface of a basal body and the surface of the coating layer through biologic bionics simulation. The method adopts texture as a method for combining a spraying pretreatment with aftertreatment, improves the bonding strength of the coating layer through texture, improves the contact fatigue resistance of the coating layer through surface texture, and prolongs the service life of the coating layer.

Description

technical field [0001] The invention relates to the technical field of spraying materials, in particular to a method for improving the fatigue strength of coatings through the coupling effect of double-layer textures. Background technique [0002] Due to the relatively high porosity of the sprayed coating itself, there are defects such as inclusions and fiber cracks, which make the sprayed coating easy to form cracks and expand during the service process, resulting in reduced service life. The improvement of the performance of the existing surface coating is mainly through the use of secondary processing technologies such as laser remelting and surface strengthening after the coating is formed. Although these technical means have played a certain role in improving the performance of the coating, the macroscopic performance is the material internal The external characterization of structure and quality, so these technologies cannot substantially improve the service performanc...

Claims

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Application Information

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IPC IPC(8): C23C24/02
CPCC23C24/02
Inventor 王海斗邢志国王晓丽谭娜马国政
Owner ACADEMY OF ARMORED FORCES ENG PLA
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