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Method for improving molten CMAS corrosion resistance of thermal barrier coating through laser surface treatment

A technology of laser surface treatment and thermal barrier coating, applied in coating, fusion spraying, metal material coating process, etc., can solve the problem that the corrosion resistance of molten CMAS cannot be explained, and there is no laser modified layer to resist molten CMAS. It is completely resistant to molten salt corrosion and other problems, and achieves the effect of improving the corrosion resistance of CMAS, excellent corrosion resistance of CMAS, and improvement of corrosion resistance of CMAS.

Active Publication Date: 2020-05-05
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that laser modification has a significant impact on the coating made of APS, so that the coating shows a strong ability to resist molten salt corrosion. Specifically, in the YSZ coating, the proportion of the m phase decreases from 62%. to 46% and the hot corrosion resistance is improved, but after the corrosion test, there is basically no molten salt on the surface of the laser modified layer, and there are molten salt components in the cracks, indicating that it cannot completely resist molten salt corrosion, and the ratio of m phase Still high, need to further improve phase stability
Therefore, the fact that the laser-modified layer can resist molten salt corrosion does not explain its corrosion resistance to molten CMAS, and there is currently no relevant report on the laser-modified layer’s resistance to molten CMAS

Method used

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  • Method for improving molten CMAS corrosion resistance of thermal barrier coating through laser surface treatment
  • Method for improving molten CMAS corrosion resistance of thermal barrier coating through laser surface treatment
  • Method for improving molten CMAS corrosion resistance of thermal barrier coating through laser surface treatment

Examples

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Effect test

Embodiment 1

[0028] 1. Prepare a thermal barrier coating on a superalloy substrate, including a bonding layer and a ceramic coating, wherein the bonding layer first prepared on the substrate is MCrAlY (M is Ni and / or Co), prepared by supersonic flame spraying , with a thickness of 50 μm.

[0029] 2. The ceramic layer prepared on the bonding layer is yttria partially stabilized zirconia (YSZ), which is prepared by atmospheric plasma spraying method, with a thickness of 95 μm.

[0030] 3. Ultrasonic cleaning is performed on the prepared thermal barrier coating to remove surface stains and impurities.

[0031] 4. The surface laser modification of the ceramic layer is carried out by using a Nd:YAG solid-state pulse laser with a rated power of 200W; a total of 16 laser paths are made on the surface of the ceramic layer, and the overlap rate of each path is 33%. The power is 80W, the frequency is 20Hz, the scan rate is 20mm / s, the spot size diameter is 2mm, and the crack density is 0.062mm -1 ...

Embodiment 2

[0038] 1. Prepare a thermal barrier coating on a high-temperature substrate, including a bonding layer and a ceramic coating, wherein the bonding layer first prepared on the substrate is MCrAlY (M is Ni and / or Co), using electron beam-physical vapor deposition method, the thickness is 45 μm.

[0039] 2. Secondly, the ceramic layer prepared on the bonding layer is yttria partially stabilized zirconia (YSZ), which is prepared by electron beam-physical vapor deposition method, with a thickness of 108 μm.

[0040] 3. Ultrasonic cleaning is performed on the prepared thermal barrier coating to remove surface stains and impurities.

[0041] 4. The surface laser modification of the ceramic layer is carried out by using a Nd:YAG solid-state pulse laser with a rated power of 200W; a total of 6 laser paths are made on the surface of the ceramic layer, the overlap rate of each path is 0, and the power in the laser parameters is 160W, frequency 40Hz, scan rate 6mm / s, spot size diameter 1mm,...

Embodiment 3

[0044] 1. Prepare a thermal barrier coating on a high-temperature substrate, including a bonding layer and a ceramic coating, wherein the bonding layer first prepared on the substrate is MCrAlY (M is Ni and / or Co), using plasma spraying-physical vapor deposition method, the thickness is 63 μm.

[0045] 2. Secondly, the ceramic layer prepared on the bonding layer is yttria partially stabilized zirconia (YSZ), prepared by atmospheric plasma spraying method, with a thickness of 114 μm.

[0046] 3. Ultrasonic cleaning is performed on the prepared thermal barrier coating to remove surface stains and impurities.

[0047] 4. The surface laser modification of the ceramic layer is carried out by using a Nd:YAG solid-state pulse laser with a rated power of 200W; a total of 10 laser paths are made on the surface of the ceramic layer, and the overlap rate of each path is 20%, and the power in the laser parameters is 80W , the frequency is 20Hz, the scan rate is 20mm / s, and the spot size ...

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Abstract

The invention provides a method for improving molten CMAS corrosion resistance of a thermal barrier coating through laser surface treatment. Laser modification surface treatment is carried out on a ceramic layer by adopting an Nd: YAG solid pulse laser with the rated power of 200W; during laser treatment, a plurality of laser paths are formed on the surface of the ceramic top layer, and in laser parameters of each path, the power is 60-160W, the frequency is 20-40Hz, the scanning rate is 6-20 mm / s, and the spot size diameter is 1-2mm. The thickness of the obtained laser modified layer is 5-25[mu] m, and the interior of the laser modified layer contains non-through longitudinal cracks. The density of the longitudinal cracks is preferably 0.05 to 0.065 mm <-1>. In the CMAS environment, thethermal barrier coating keeps phase stability and structure stability and is applied to surface protection of aero-engine hot end components.

Description

technical field [0001] The invention discloses a laser surface treatment method for improving the corrosion resistance of a thermal barrier coating against molten CMAS. The thermal barrier coating includes a laser modified layer, an unmodified ceramic layer, a bonding layer and a superalloy substrate, and belongs to Surface processing technology field. Background technique [0002] Modern gas turbine engines require higher operating temperatures in pursuit of higher thermal efficiency. Thermal barrier coatings (TBC) applied to the hot parts of the engine can be used for thermal insulation to reduce engine surface temperature and improve performance [0003] The TBC actually used for starting has a multi-layer structure, usually consisting of a ceramic topcoat that provides thermal insulation, a metal bonding layer that resists oxidation, and a thermally grown oxide (TGO) layer formed on the bonding layer due to oxidation. The ceramic layer material is generally 7%wt YSZ, u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B41/80C23C4/18C23C14/58
CPCC04B41/009C04B41/80C04B35/48C04B35/62222C23C4/18C23C14/58C04B2235/3225C04B2235/3246
Inventor 郭磊高远辛会颜正
Owner TIANJIN UNIV
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