A kind of sandblasting layer stripping method for combined hammering and cutting to remove damaged environmental barrier coating

An environmental barrier and coating technology, applied in the coating field, can solve the problems of EBC peeling and scrapping.

Active Publication Date: 2021-04-20
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the environment of high-temperature gas and high-speed erosion of aero-engines, EBCs after a period of service often suffer from damage such as spalling. If not repaired in time, expensive ceramic matrix composites may be scrapped at one time, and even cause severe damage in subsequent continuous use. ACCIDENT

Method used

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  • A kind of sandblasting layer stripping method for combined hammering and cutting to remove damaged environmental barrier coating
  • A kind of sandblasting layer stripping method for combined hammering and cutting to remove damaged environmental barrier coating
  • A kind of sandblasting layer stripping method for combined hammering and cutting to remove damaged environmental barrier coating

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Embodiment 1

[0032] see Figure 1 to Figure 3 As shown, the preparation method of the present invention is illustrated by taking alumina sand to remove the ytterbium silicate coating on the surface of the silicon carbide-based ceramic matrix composite material as an example. The micro-Vickers hardness of the alumina used is 19-21.6GPa, the micro-Vickers hardness of the silicon carbide of the matrix is ​​more than 30GPa, and the micro-Vickers hardness of the ytterbium silicate is less than 10GPa. Therefore, the selected removal grit meets the requirement that the hardness is less than that of the substrate and greater than that of the coating.

[0033] The invention provides a sandblasting layer stripping method for combined hammering and cutting to remove a damaged environmental barrier coating, comprising the following steps:

[0034] Step 1, use spherical alumina sand particles with a particle size of 800-1000 μm, and use a sandblasting machine to damage the environmental barrier coatin...

Embodiment 2

[0039]The difference between this example and Example 1 is that in steps 1 and 2, the particle size of the coarse sand is 650-800 μm, the angle of attack in step 1 is 75°, the angle of attack in step 2 is 15°, and the removal time is 2min. In step 4, the environmental barrier coating 5 is damaged by erosion at an angle of attack of 30° by using polygonal alumina sand grains with a particle size of 50 μm to 450 μm until 95% of the substrate area is exposed and the substrate is intact.

Embodiment 3

[0041] The difference between this example and Example 1 is that in steps 1 and 2, the particle size of the coarse sand is 500-650 μm, the angle of attack in step 1 is 60°, the angle of attack in step 2 is 0°, and the removal time is 1min.

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Abstract

The invention discloses a sandblasting layer stripping method for combined hammering and cutting to remove a damaged environmental barrier coating. Firstly, the sand material whose hardness is smaller than the substrate and larger than the coating material is screened; The angle of attack forms a compound action of hammering / cutting on the surface of the coating to achieve the purpose of peeling off the coating layer by layer and exposing 70% of the substrate surface; finally, fine sand of 50-450 μm is used at an angle of attack of 0°-30° Erosion of the coating to remove the local residual coating to achieve the purpose of exposing more than 95% of the substrate area. The sandblasting removal method of the damaged environmental barrier coating based on the combined action of hammering / cutting proposed by the present invention can effectively remove the damaged environmental barrier coating without damaging the substrate, so as to ensure high-quality new coating layer preparation.

Description

technical field [0001] The invention belongs to the technical field of coatings, in particular to an efficient non-destructive removal method for damaging environmental barrier coatings. Background technique [0002] The goal pursued by modern aero-engines is to continuously increase the thrust-to-weight ratio and reduce service costs. With the increase of the thrust-to-weight ratio, it is necessary to further increase the temperature before the engine turbine. At present, the average temperature of the engine turbine inlet has far exceeded the service temperature of superalloys and intermetallic compounds. Therefore, the existing high-temperature alloy material system has been difficult to meet the needs of advanced aero-engines. Because of its high temperature resistance, low density, and high strength, ceramic matrix composites are considered to be the most promising high-temperature structural materials to replace superalloys in engine hot-end parts. At present, more ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B24C1/08
CPCB24C1/08
Inventor 杨冠军李广荣刘梅军杨博李成新李长久
Owner XI AN JIAOTONG UNIV
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