Abstract
This study aims to enhance the oxidation resistance of ceramic coatings through designing and optimizing microstructure. A series of double-layered lanthanum–cerium oxide (LC) and 8 wt% yttria-partially-stabilized zirconia (YSZ) coatings with different thickness ratios were tailored. The isothermal oxidation experiment and molecular dynamics simulation results suggested that due to the lower oxygen ionic diffusion coefficient, double-layered LC/YSZ coatings exhibited an excellent antioxidation property compared to the single-layer YSZ coating. However, with the increase of LC layer thickness in LC/YSZ coatings, sintering-induced vertical cracks were easily formed within LC layer, which significantly shortened the oxidation resistance of LC/YSZ coatings by a burner rig test at 1225 °C. The equivalent thermal growth oxide thickness manifested that the optimum thickness ratio between LC and YSZ layers was 1:2.
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Acknowledgements
This work was supported by National Key R&D Program of China (No. 2018YFB2004002), Natural Science Foundation of Shaanxi Province (Nos. 2019TD-020 and 2019JQ-586), China Postdoctoral Science Foundation (No. 2019M653598), Shanxi Province Science Foundation for Youths (No. 201901D211258) and Science Foundation of North University of China (No. XJJ201920).
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Zhang, L., Fan, W., Wang, Y. et al. Oxidation Resistance of Plasma-Sprayed Double-Layered LC/YSZ Coatings with Different Thickness Ratios at High Temperatures. Oxid Met 94, 397–408 (2020). https://doi.org/10.1007/s11085-020-09998-z
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DOI: https://doi.org/10.1007/s11085-020-09998-z