Preparation method of high-temperature anti-abrasion antioxidation coating

An anti-oxidation coating and wear-resistant technology, which is applied in coating, metal material coating process, fusion spraying, etc., can solve the problem of low bonding strength between coating and substrate, achieve excellent comprehensive performance and improve bonding strength , Reduce the effect of cracks and pores

Inactive Publication Date: 2018-11-30
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, thermal spray coatings generally contain a large number of defects such as cracks and pores, and the bonding strength betwe

Method used

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  • Preparation method of high-temperature anti-abrasion antioxidation coating
  • Preparation method of high-temperature anti-abrasion antioxidation coating
  • Preparation method of high-temperature anti-abrasion antioxidation coating

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preparation example Construction

[0031] A method for preparing a high-temperature wear-resistant and anti-oxidation coating of the present invention 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 comprehensive performance of the coating; the specific steps are as follows:

[0032] S1. Substrate cutting and cleaning

[0033] 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;

[0034] S2, sample sand blasting treatment

[0035] 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 the sample;

...

Embodiment 1

[0045] The spraying tests were carried out using a SulZer Metco 9M plasma spraying apparatus. The prepared spraying powder is dried in a vacuum drying oven to ensure the fluidity of the powder during the spraying process. Before spraying, preheat the base material first to reduce the temperature difference between the base and the spray powder, and effectively improve the bonding strength of the coating. When the base material is preheated to 400°C, the spraying test is carried out. During the spraying process, the Ar flow rate is 40L / min, the H 2 The flow rate is 5L / min, the spraying angle is 90°, the powder feeding rate is 42g / min, the current is 500A, the voltage is 55V, and the spraying distance is 100mm. The prepared coating contains a large number of defects such as cracks and pores, and the interface between the substrate and the coating also contains a large number of pores, such as figure 1 shown. The thickness of the coating is 320 μm, the microhardness is 329.8HV...

Embodiment 2

[0047] The coating of Example 1 was subjected to vacuum heat treatment at 900°C in a vacuum heat treatment furnace with a heating rate of 10°C / min, kept for 1 hour, and then cooled with the furnace. After heat treatment, defects such as cracks and pores in the coating structure are significantly reduced, and the pores at the interface between the substrate and the coating are also relatively reduced, such as figure 2 shown. The thickness of the coating is 350μm, the microhardness is 337.4HV, which is higher than that before heat treatment; the porosity is 6.71%, which is obviously lower than that before heat treatment. According to the requirements of ASTM C633 standard, the bonding strength of the coating measured on a universal testing machine is 54.0MPa, which is greatly improved compared with that before heat treatment. At the same time, the tribological properties of the coating were tested on the UMT high-temperature friction testing machine, and the wear rate of the c...

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Abstract

The invention discloses a preparation method of a high-temperature anti-abrasion antioxidation coating. Firstly, a substrate specimen is subjected to sand blasting treatment; then, the specimen is subjected to spray coating treatment by a plasma spray coating method; finally, a MCrAlY coating is prepared through high-temperature vacuum heat treatment. The coating is subjected to vacuum heat treatment, so that the defects such as cracks and pores in the coating are effectively reduced; the bonding intensity of the coating is obviously improved; after 1100 DEG C heat treatment, the porosity of the coating is reduced to 0.86 percent; the bonding intensity is improved to 62.1Mpa; at high temperature of 900 DEG C, excellent abrasion performance and antioxidation performance are realized; the comprehensive performance is good.

Description

technical field [0001] The invention belongs to the technical field of coating materials, and in particular relates to a preparation method of a high-temperature wear-resistant and anti-oxidation 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 lubricating par...

Claims

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Application Information

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IPC IPC(8): C23C4/134C23C4/073C23C4/18C23C4/02
CPCC23C4/02C23C4/073C23C4/134C23C4/18
Inventor 李博郑巧玲高义民李聪李烨飞郑开宏王娟
Owner XI AN JIAOTONG UNIV
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