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A method for improving the stability of thermal barrier coatings in natural environment

A thermal barrier coating, natural environment technology, applied in the direction of coating, superimposed layer plating, metal material coating process, etc., can solve the problems of loss of thermal protection, volume expansion, engine safety hazards, etc. The effect of reducing risk, improving compactness and improving thermal stability

Active Publication Date: 2022-08-05
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Rare earth oxides are all basic oxides, which react with water vapor and carbon dioxide in humid air and expand in volume. Long-term storage in the natural environment will cause cracks or even pulverization inside the coating, which greatly reduces the thermal barrier coating. Stability in the wild
If the thermal barrier coating is pulverized, it will lose its thermal protection effect, which is a major safety hazard to the engine
[0008] At present, all patents and other documents related to thermal barrier coatings do not involve subsequent heat treatment methods, and cannot meet the requirements for long-term storage in natural environments, and the storage life is difficult to exceed 5 years

Method used

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  • A method for improving the stability of thermal barrier coatings in natural environment
  • A method for improving the stability of thermal barrier coatings in natural environment

Examples

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Effect test

Embodiment 1

[0023] A method for improving the stability of a thermal barrier coating in a natural environment includes keeping the thermal barrier coating in an inert gas environment at 800 DEG C for 3 hours, and then in an atmospheric environment at 600 DEG C for 0.5 hours. Wherein, the preparation method of the thermal barrier coating is as follows: prepare a MCrAlY metal layer on the surface of the metal substrate by the method of multi-arc ion plating, with a thickness of 0.05mm; and then prepare YSZ ceramics on the surface of the metal layer by the method of electron beam-physical vapor deposition layer, thickness 0.1mm.

Embodiment 2

[0025] A method for improving the stability of a thermal barrier coating in a natural environment includes keeping the thermal barrier coating in an inert gas environment at 900 DEG C for 2 hours, and then in an atmospheric environment at 500 DEG C for 1 hour. Wherein, the preparation method of the thermal barrier coating is as follows: prepare a MCrAlY metal layer on the surface of a metal substrate by a supersonic flame spraying method, with a thickness of 0.15 mm; prepare a rare earth aluminate ceramic layer on the surface of the metal layer by a plasma spraying method, with a thickness of 0.25 mm mm.

Embodiment 3

[0027] A method for improving the stability of a thermal barrier coating in a natural environment includes keeping the thermal barrier coating in a vacuum environment at 1050 DEG C for 1 hour, and then in an atmospheric environment at 600 DEG C for 0.5 hour. Wherein, the preparation method of the thermal barrier coating is as follows: prepare a MCrAlY metal layer on the surface of the metal substrate by supersonic flame spraying with a thickness of 0.1 mm; prepare a YSZ ceramic layer on the surface of the metal layer by plasma spraying with a thickness of 0.15 mm.

[0028] figure 1 is the appearance of the thermal barrier coating after heat treatment. figure 2 It is the appearance of the coating after 240 hours of high temperature and high pressure accelerated damp heat test. The appearance of the coating is complete, there is no crack or chalking phenomenon, and no phase change occurs.

[0029] The high temperature and high pressure accelerated damp heat test process is: pu...

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Abstract

The invention discloses a method for improving the stability of a thermal barrier coating in a natural environment, that is, after preparing the thermal barrier coating, the thermal barrier coating is kept in a vacuum or inert gas environment at a temperature between 800° C. and 1100° C. for 1~1~ 3 hours, and then keep the temperature between 400°C and 600°C for 0.5 to 1 hour in the atmospheric environment. The invention improves the stability of the thermal barrier coating in the natural environment by performing a subsequent heat treatment method on the thermal barrier coating, and the storage life in the natural environment reaches more than 10 years.

Description

technical field [0001] The invention belongs to the thermal protection technology of a gas turbine, and particularly relates to a method for improving the stability of a thermal barrier coating in a natural environment. Background technique [0002] The thermal barrier coating is a coating that acts as a heat insulating layer on the surface of a metal substrate, including a metal layer that acts as an anti-oxidation and buffering thermal expansion on the surface of the metal substrate and a ceramic layer that acts as a heat insulating layer. The preparation process of the thermal barrier coating is as follows: firstly prepare a metal layer on the surface of the metal substrate with a thickness of 0.05-0.15mm; then prepare a ceramic layer on the surface of the metal layer with a thickness of 0.1-0.25mm. Thermal barrier coatings have been widely used in the thermal protection of aero-engines, aerospace engines, ground gas turbines and missiles. [0003] The thermal barrier co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/073C23C4/11C23C4/129C23C4/134C23C14/08C23C14/14C23C14/30C23C14/32C23C28/00
CPCC23C4/129C23C4/134C23C4/073C23C14/325C23C14/30C23C14/14C23C14/08C23C14/083C23C4/11C23C28/3215C23C28/3455C23C28/345
Inventor 曹学强袁洁燕王进双蒋佳宁邓龙辉曹沁周鑫董淑娟
Owner WUHAN UNIV OF TECH