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<p>In order to obtain highly reliable thermal barrier coatings (TBCs) with extended thermal service lifetime, different fractions of Ti<sub>3</sub>AlC<sub>2</sub> self-healing agent and Ceria and Yttria-Stabilized Zirconia (CYSZ) were melted into the plasma-sprayed 8YSZ TBCs by a fiber-coupled semiconductor laser. The effect of Ti<sub>3</sub>AlC<sub>2</sub> content on the microstructure, phase composition, and thermal shock behaviors of the self-healing TBCs was investigated. Results indicated that the self-healing TBCs exhibited superior thermal shock resistance in comparison to the untreated TBCs. The thermal shock resistance of the self-healing TBCs with 15% Ti<sub>3</sub>AlC<sub>2</sub> was increased by 110% compared with that of the untreated TBCs. The columnar grains and vertical cracks presented in the self-healing TBCs could enhance strain compatibility during the thermal shock process. In addition, the Ti<sub>3</sub>AlC<sub>2</sub> as a self-healing agent reacted with oxygen in air at elevated temperatures to seal the microcracks effectively, thereby delaying the crack connection.</p>

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Microstructure and Thermal Shock Resistance of Self-Healing Thermal Barrier Coatings with Different Ti3AlC2 Content

  • 期刊论文

  • 发表日期：

    2026年2月23日

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  • Panpan Zhang,
  • Chenchun Liang,
  • Fang Luo,
  • Bo Li,
  • Szymon Tofil,
  • Jianhua Yao

摘要

In order to obtain highly reliable thermal barrier coatings (TBCs) with extended thermal service lifetime, different fractions of Ti3AlC2 self-healing agent and Ceria and Yttria-Stabilized Zirconia (CYSZ) were melted into the plasma-sprayed 8YSZ TBCs by a fiber-coupled semiconductor laser. The effect of Ti3AlC2 content on the microstructure, phase composition, and thermal shock behaviors of the self-healing TBCs was investigated. Results indicated that the self-healing TBCs exhibited superior thermal shock resistance in comparison to the untreated TBCs. The thermal shock resistance of the self-healing TBCs with 15% Ti3AlC2 was increased by 110% compared with that of the untreated TBCs. The columnar grains and vertical cracks presented in the self-healing TBCs could enhance strain compatibility during the thermal shock process. In addition, the Ti3AlC2 as a self-healing agent reacted with oxygen in air at elevated temperatures to seal the microcracks effectively, thereby delaying the crack connection.