Effect of TiAl3 Content on Thermal Shock Resistance of Bionic 
Self‑healing Thermal Barrier Coatings

doi:10.1007/s42235-021-00108-6

Journal of Bionic Engineering ›› 2022, Vol. 19 ›› Issue (1): 126-138.doi: 10.1007/s42235-021-00108-6

Effect of TiAl3 Content on Thermal Shock Resistance of Bionic Self‑healing Thermal Barrier Coatings

Panpan Zhang1,2, Yujia Guo1,2, Zhihui Zhang3, Xiaofeng Zhang4, Qunli Zhang1,2, Jianhua Yao1,2

1 Institute of Laser Advanced Manufacturing, Zhejiang University of Technology, Hangzhou 310023, China 2 Collaborative Innovation Center of High-End Laser Manufacturing Equipment (National “2011 Plan”), Zhejiang University of Technology, Hangzhou 310023, China 3 The Key Laboratory of Bionic Engineering (Ministry of Education China), Jilin University, Changchun 130022, China 4 Institute of New Materials, Guangdong Academy of Sciences, Guangzhou 510650, China

Received:2021-08-09 Revised:2021-10-07 Accepted:2021-10-10 Online:2022-01-10 Published:2022-02-20
Contact: Jianhua Yao E-mail:laser@zjut.edu.cn
About author:Panpan Zhang1,2, Yujia Guo1,2, Zhihui Zhang3, Xiaofeng Zhang4, Qunli Zhang1,2, Jianhua Yao1,2

Abstract

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 diferent 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 efect 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 frst 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.

Key words: Thermal barrier coating, Laser, Bionic self-healing, Thermal shock resistance

Panpan Zhang, Yujia Guo, Zhihui Zhang, Xiaofeng Zhang, Qunli Zhang, Jianhua Yao. Effect of TiAl3 Content on Thermal Shock Resistance of Bionic Self‑healing Thermal Barrier Coatings[J].Journal of Bionic Engineering, 2022, 19(1): 126-138.

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