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Laser micro-texture modified thermal barrier coating for delaying interface TGO growth and preparation process of laser micro-texture modified thermal barrier coating

A preparation process and technology of thermal barrier coatings, which are applied in metal material coating processes, laser welding equipment, coatings, etc., can solve the problems of instability expansion, limit the high temperature service life of thermal barrier coatings, etc., and achieve slow and dense maintenance Growth, ensuring long life and stable operation, and reducing oxidation consumption

Active Publication Date: 2022-07-29
SHANDONG UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Current research shows that one of the main causes of spalling failure of traditional thermal sprayed double-layer thermal barrier coatings is the abnormal growth and thickening of the TGO layer, which leads to the rapid destabilization and expansion of large-scale cracks at the bonding layer-ceramic layer interface, which seriously limits High temperature service life of thermal barrier coating

Method used

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  • Laser micro-texture modified thermal barrier coating for delaying interface TGO growth and preparation process of laser micro-texture modified thermal barrier coating
  • Laser micro-texture modified thermal barrier coating for delaying interface TGO growth and preparation process of laser micro-texture modified thermal barrier coating
  • Laser micro-texture modified thermal barrier coating for delaying interface TGO growth and preparation process of laser micro-texture modified thermal barrier coating

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Embodiment 1

[0029] A laser microtexture modified thermal barrier coating for retarding the growth of interface TGO and a preparation process thereof, comprising the following steps:

[0030]On the surface of the superalloy substrate roughened by sandblasting, NiCoCrAlY powder with a particle size of 45-90 μm was used to prepare a bonding layer with a thickness of 120 μm by atmospheric plasma spraying technology. The flow rate is 40L / min, the auxiliary gas helium flow rate is 7.5L / min, the powder feeding gas argon gas flow rate is 4L / min, the spraying distance is 110mm, and the powder feeding speed is 18g / min. Use sandpaper to grind the surface of the bonding layer to level, and then use nanosecond pulse laser technology to ablate the surface of the bonding layer to process the micro-pit texture array arranged in parallel. The specific process is, the pulse width is 100ns, the average pulse power is 20w, The pit diameter is 50 μm, the depth is 25 μm, and the pit center spacing is 70 μm. F...

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Abstract

The invention relates to a laser micro-texture modified thermal barrier coating for delaying interface TGO growth and a preparation process thereof, a laser micro-pit texture array is introduced into a traditional low-cost thermal barrier coating, a bonding layer-ceramic layer interface microstructure is rapidly and accurately controlled, and the bonding quality of a bonding layer-ceramic layer deposition interface is excellent. The laser micro-texture modified thermal barrier coating comprises a high-temperature alloy matrix, a metal bonding layer, a micro-pit texture array with an inner wall remelting densification layer on the surface of the bonding layer, and a ceramic thermal insulation layer. The remelting densification layer is arranged, the micro-pit texture array is prepared through direct ablation of pulse laser beams, and the pit inner wall coating structure is remelted and densified, so that the surface microstructure densification of the bonding layer is realized, the Al element consumption during high-temperature service of the thermal barrier coating is remarkably reduced, the microcrack propagation resistance of the bonding layer-ceramic layer interface is increased, and the thermal barrier property of the thermal barrier coating is improved. And the long-acting service efficiency of the thermal barrier coating is improved.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a laser microtexture modified thermal barrier coating for delaying the growth of interface TGO and a preparation process thereof. Background technique [0002] The information disclosed in this Background section is only for enhancement of understanding of the general background of the invention and should not necessarily be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art. [0003] At present, the thermal barrier coatings used in large-scale industrial applications are plasma sprayed double-layer structures, including MCrAlY (M=Ni, Co, or NiCo) anti-oxidative bonding layers and ceramic thermal insulation layers (such as ZrO2-8wt.%Y 2 O 3 Yttria stabilized zirconia material, YSZ). During high-temperature service, the bonding layer-ceramic layer interface is formed with α-Al. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/02C23C4/073C23C4/10B23K26/0622B23K26/70
CPCC23C4/134C23C4/02C23C4/073C23C4/10B23K26/0624B23K26/702Y02T50/60
Inventor 张永昂韩家森陈姬吴东亭邹勇
Owner SHANDONG UNIV
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