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Thermal Cycling Behavior of Selective Laser-Remelted Thermal Barrier Coatings with Different Laser Dot Distances

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Abstract

The two-layer structured YSZ/NiCrAlY coatings were modified with dot shape by laser remelting. The microstructure, phase composition and thermal cycling behaviors of the as-sprayed and laser-treated coatings with different laser dot distances were investigated. The thermal cycling behaviors of the as-sprayed and laser-treated coatings were studied systematically at 1000 °C. The results indicated that the coating with 3 mm distance between the laser-treated zone, namely the dot distance, showed the longest thermal cycling lifetimes, which was approximately 2.5 times as much as that of the as-sprayed coating. For one thing, the columnar grains and segmented cracks in the dot units were beneficial for accommodating the thermal stresses of coatings during thermal cycling. For another, a certain number of microcracks in the dot units could release the driving force for crack propagation, namely the elastic energy.

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Acknowledgments

This work is supported by Natural Science Foundation of Zhejiang Province (LQ21E010002), Guangdong Basic and Applied Basic Research Foundation (2020A1515011096), Natural Science Foundation of Guangdong Province (2016A030312015), Guangzhou Project of Science & Technology (202007020008), Youth Project of Fujian Provincial Department of Education (JAT170379), Scientific Research Project of Fujian Institute of Technology (GY-Z160006).

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Authors and Affiliations

  1. Institute of Laser Advanced Manufacturing, Zhejiang University of Technology, Hangzhou, 310023, People’s Republic of China

    Panpan Zhang, Lei Sun, Qunli Zhang & Jianhua Yao

  2. Collaborative Innovation Center of High-end Laser Manufacturing Equipment (National “2011 Plan”), Zhejiang University of Technology, Hangzhou, 310023, People’s Republic of China

    Panpan Zhang, Lei Sun, Qunli Zhang & Jianhua Yao

  3. The Key Lab of Guangdong for Modern Surface Engineering Technology, National Engineering Laboratory for Modern Materials Surface Engineering Technology, Institute of New Materials, Guangdong Academy of Sciences, Guangzhou, 510651, People’s Republic of China

    Xiaofeng Zhang & Yueliang Wang

  4. School of Materials Science and Engineering, Fujian University of Technology, Fuzhou, 350118, People’s Republic of China

    Fa Chang

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  1. Panpan Zhang
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Correspondence to Jianhua Yao.

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Zhang, P., Sun, L., Zhang, X. et al. Thermal Cycling Behavior of Selective Laser-Remelted Thermal Barrier Coatings with Different Laser Dot Distances. J Therm Spray Tech 30, 1038–1048 (2021). https://doi.org/10.1007/s11666-021-01173-3

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