Abstract
Inspired by the self-healing function of biological organisms, Bionic Laser Alloying (BLA) process was adopted to fabricate the bionic self-healing Thermal Barrier Coatings (TBCs). The BLA with different fractions of TiAl3 self-healing agent and Ceria and Yttria-Stabilized Zirconia (CYSZ) on the plasma-sprayed 7YSZ TBCs was carried out by a pulsed Nd: YAG laser. The effect of TiAl3 content on the microstructure, phase composition, and thermal shock behaviors of the bionic self-healing TBCs were investigated. Results indicated that the bionic self-healing TBCs had better thermal shock resistance than that of the as-sprayed TBCs. The thermal shock resistance increased first and then decreased with increasing TiAl3 fraction. The thermal shock resistance of the bionic self-healing TBCs with 15% TiAl3 is triple that of the as-sprayed TBCs. On one hand, the columnar crystals and vertical cracks could improve strain compatibility of TBCs during the thermal shock process; on the other hand, the TiAl3 as a self-healing agent reacted with oxygen in air at high temperature to seal the microcracks, thereby delaying the crack connection.
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Acknowledgements
This work is supported by National Natural Science Foundation of China (Grant No. 52105311), Natural Science Foundation of Zhejiang Province (Grant No. LQ21E010002), and Fundamental Research Funds for the Provincial Universities of Zhejiang (Grant No. RF-A2020009).
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Zhang, P., Guo, Y., Zhang, Z. et al. Effect of TiAl3 Content on Thermal Shock Resistance of Bionic Self-healing Thermal Barrier Coatings. J Bionic Eng 19, 126–138 (2022). https://doi.org/10.1007/s42235-021-00108-6
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DOI: https://doi.org/10.1007/s42235-021-00108-6