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Preparation method of high-temperature wear-resistant oxidation-resistant coating

A wear-resistant and coating technology, applied in coating, metal material coating process, fusion spraying, etc., can solve the problem of low bonding strength between the coating and the substrate, and achieve excellent comprehensive performance, good wear resistance and Oxidation resistance, effect of reducing defects such as cracks and pores

Inactive Publication Date: 2019-12-03
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, thermal spray coatings generally contain a large number of defects such as cracks and pores, and the bonding strength between the coating and the substrate is low, which will limit the promotion and application of coating materials under harsh conditions.

Method used

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  • Preparation method of high-temperature wear-resistant oxidation-resistant coating
  • Preparation method of high-temperature wear-resistant oxidation-resistant coating
  • Preparation method of high-temperature wear-resistant oxidation-resistant coating

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Experimental program
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Effect test

preparation example Construction

[0034] The present invention provides a method for preparing a high-temperature, wear-resistant and oxidation-resistant coating, which effectively improves the structure of the coating through heat treatment, reduces defects such as cracks and pores in the coating, and can further improve the overall performance of the coating; the specific steps are as follows:

[0035] S1. Substrate cutting and cleaning

[0036] In the test process, the base material of the coating is Inconel 718 superalloy, and the base material bar is first cut into Use sandpaper to grind the surface of the sample, and then ultrasonically clean the polished sample in alcohol for 20-60 minutes to remove the oil stains on the surface of the sample;

[0037] S2, sample sand blasting treatment

[0038] Before spraying, sandblast the cleaned sample to improve the bonding strength of the coating. After sandblasting, the sample is ultrasonically cleaned in alcohol to clean the remaining sand on the surface of t...

Embodiment 1

[0051] S1. In the test process, the base material of the coating is Inconel 718 superalloy, and the base material bar is first cut into Grind the surface of the sample with sandpaper, and then ultrasonically clean the polished sample in alcohol for 20 minutes to remove the oil stains on the surface of the sample;

[0052] S2. Before spraying, sandblast the cleaned sample to improve the bonding strength of the coating. After sandblasting, ultrasonically clean the sample in alcohol to clean the remaining sand on the surface of the sample;

[0053] S3. Before spraying, first dry the powder in a vacuum drying oven at 40°C with a vacuum of 1×10 -1 Pa, to ensure smooth powder feeding during spraying.

[0054] First, preheat the sample, and conduct the spraying test when the sample is preheated to 300°C;

[0055] The spraying powder used in the test process is Sulzer Metco finished MCrAlY powder, the powder particle size range is 53 μm, the sphericity is good, and it has good flui...

Embodiment 2

[0062] S1. In the test process, the base material of the coating is Inconel 718 superalloy, and the base material bar is first cut into Grind the surface of the sample with sandpaper, and then ultrasonically clean the polished sample in alcohol for 40 minutes to remove the oil stains on the surface of the sample;

[0063] S2. Before spraying, sandblast the cleaned sample to improve the bonding strength of the coating. After sandblasting, ultrasonically clean the sample in alcohol to clean the remaining sand on the surface of the sample;

[0064] S3, spraying

[0065] Before spraying, first dry the powder in a vacuum drying oven at 50°C with a vacuum of 3×10 -1 Pa, to ensure smooth powder feeding during spraying.

[0066] The spraying test was carried out on the SulZer Metco 9M instrument in the laboratory. Before the spraying test, the sample was preheated first, and the spraying test was carried out when the sample was preheated to 400°C;

[0067] The spraying powder used...

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Abstract

The invention discloses a preparation method of a high-temperature wear-resistant oxidation-resistant coating. The method comprises the following steps: firstly, carrying out sand blasting treatment on a substrate sample, then carrying out spraying treatment on the sample by adopting a plasma spraying method, fixing the sample on a rotary table while a spray gun moves in the spraying process, enabling the sample to rotate quickly, effectively preventing the coating from being locally overheated, and finally, carrying out high-temperature vacuum heat treatment to prepare the MCrAlY coating. Thecoating is subjected to vacuum heat treatment, so the defects of cracks, pores and the like in the coating are effectively reduced, and the bonding strength of the coating is obviously improved; after heat treatment at 1100 DEG C, the porosity of the coating is reduced to 0.86%, the bonding strength is improved to 62.1 Mpa, and the coating has excellent wear resistance and oxidation resistance atthe high temperature of 900 DEG C and is good in comprehensive performance.

Description

technical field [0001] The invention belongs to the technical field of coating materials, and in particular relates to a method for preparing a high-temperature, wear-resistant and oxidation-resistant coating. Background technique [0002] With the continuous development of science and technology, high-tech industries such as aerospace, thermonuclear, energy and power engineering need more and more mechanical equipment to operate under extremely harsh conditions such as high temperature, high speed and high load, and the wear and tear caused by it The problem of failure and the resulting waste of resources and energy has become increasingly prominent. Especially for high-temperature machinery represented by advanced engines, with the increase of the thrust-to-weight ratio of the engine, the temperature of the inlet and outlet of the engine, the temperature of the combustion chamber and the speed of the engine have been greatly increased, requiring high-temperature lubricatin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/073C23C4/02C23C4/18C23C4/137
CPCC23C4/02C23C4/073C23C4/134C23C4/137C23C4/18
Inventor 李博高义民李聪康云川郑巧玲赵四勇
Owner XI AN JIAOTONG UNIV
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