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Thermo-Physical Properties and Thermal Shock Resistance of Segmented La2Ce2O7/YSZ Thermal Barrier Coatings

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Abstract

La2Ce2O7 (LCO)/yttria-stabilized zirconia (YSZ) thermal barrier coating (TBC) with segmentation crack structure was produced by atmospheric plasma spraying. Thermo-physical properties, such as thermal diffusivities and thermal conductivities, and thermal cycling performance of the segmented LCO/YSZ TBC were investigated. The thermal conductivity of the segmented coating was measured to be around 1.02 W/mK at 1200 °C, relatively lower than that of the non-segmented coating, respectively. The segmented LCO/YSZ TBC exhibited a thermal cycling lifetime of around 2100 cycles, improving the durability by nearly 50% as compared to the non-segmented TBC. The failure of the segmented coating occurred by chipping spallation and delamination cracking within the coating.

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Acknowledgments

This research is sponsored by national natural science Foundation of China (NSFC, NO. 50771009 and NO. 50731001) and program for Changjiang scholars and innovative research team in university (PCSIRT) (IRT0512).

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics (BUAA), Xueyuan Road, No. 37, Beijing, 100191, China

    Hongbo Guo, Yi Wang, Lu Wang & Shengkai Gong

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  1. Hongbo Guo
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  2. Yi Wang
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  3. Lu Wang
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  4. Shengkai Gong
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Correspondence to Hongbo Guo.

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Guo, H., Wang, Y., Wang, L. et al. Thermo-Physical Properties and Thermal Shock Resistance of Segmented La2Ce2O7/YSZ Thermal Barrier Coatings. J Therm Spray Tech 18, 665–671 (2009). https://doi.org/10.1007/s11666-009-9350-1

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