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Improving Thermal Shock Resistance of Plasma-Sprayed Yttria-Stabilized Zirconia Thermal Barrier Coatings by Laser Remelting

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Abstract:

This paper deals with the microstructure and thermal shock behavior of laser remelting of yttria-stabilized zirconia (YSZ) thermal barrier coatings (TBCs) deposited by plasma spraying. The microstructures of the coatings were analyzed by scanning electron microscopy (SEM). It was found that the as-sprayed ceramic coating had laminated structure with high porosity. However, the coating exhibited a dense lamellar-like layer with segment cracks on the remained plasma-sprayed porous layer. Thermal shock experiments for the two kinds of TBCs were performed by water quenching method. Testing result showed that the laser-remelted TBC had better thermal shock resistance than the as-sprayed one. The damage mode of the as-sprayed TBC was great-size whole spalling. In contract, the failure mechanism of the laser-remelted one was mainly local pelling. Segmented cracks of the top ceramic coatings caused by laser remelting improved the stress accommodation and were mainly attributed to the enhancement for thermal shock life of TBC.

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Periodical:

Advanced Materials Research (Volumes 472-475)

Pages:

2502-2507

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.472-475.2502

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Online since:

February 2012

Authors:

Zong Yin Duan, Dong Sheng Wang

Keywords:

Laser Remelting, Plasma Spraying, Thermal Barrier Coating (TBC), Thermal Shock, Yttria Stabilized Zirconia (YSZ)

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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