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<p>Y<sub>2</sub>O<sub>3</sub>&#xa0;stabilized ZrO<sub>2</sub> thermal barrier coatings (YSZ TBCs) as well as CeO<sub>2</sub> and Y<sub>2</sub>O<sub>3</sub> co-stabilized ZrO<sub>2</sub> thermal barrier coatings (CeYSZ TBCs), which were composed of bond coating (CoNiCrAlY coating) and top coating (YSZ coating or CeYSZ coating), were prepared by atmospheric plasma spraying. Their morphologies, phase composition, mechanical properties, and thermal shock resistance were investigated comparatively. The results demonstrated that the cross section porosity, phase composition, elastic modulus, and fracture toughness of as-sprayed YSZ coating were 11.3%, T'-ZrO<sub>2</sub>, 233.8 GPa, and 4.3 MPa.m<sup>1/2</sup>, respectively, while those of as-sprayed CeYSZ coating were 8.7%, T-ZrO<sub>2</sub> + C-ZrO<sub>2</sub>, 187.7 GPa, and 4.7 MPa.m<sup>1/2</sup>, respectively. After thermal shock experiment, the phase composition of both YSZ coating and CeYSZ coating was T-ZrO<sub>2</sub> + C-ZrO<sub>2</sub>, the thermal shock life of YSZ TBCs and CeYSZ TBCs was 370 times and 439 times, respectively, and their thermal shock failure modes were edge delamination. CeYSZ TBCs exhibited superior thermal shock resistance, which was because the CeO<sub>2</sub> doping improved mechanical properties and reduced the growth rate of thermally grown oxide.</p>

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Effect of CeO2 Doping on Thermal Shock Resistance of Y2O3-Stabilized ZrO2 Thermal Barrier Coatings

  • 期刊论文

  • 发表日期：

    2025年4月21日

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  • Y.S. Dong,
  • L.C. Kong,
  • T.S. Dong,
  • Q.J. Zhang

摘要

Y2O3 stabilized ZrO2 thermal barrier coatings (YSZ TBCs) as well as CeO2 and Y2O3 co-stabilized ZrO2 thermal barrier coatings (CeYSZ TBCs), which were composed of bond coating (CoNiCrAlY coating) and top coating (YSZ coating or CeYSZ coating), were prepared by atmospheric plasma spraying. Their morphologies, phase composition, mechanical properties, and thermal shock resistance were investigated comparatively. The results demonstrated that the cross section porosity, phase composition, elastic modulus, and fracture toughness of as-sprayed YSZ coating were 11.3%, T'-ZrO2, 233.8 GPa, and 4.3 MPa.m1/2, respectively, while those of as-sprayed CeYSZ coating were 8.7%, T-ZrO2 + C-ZrO2, 187.7 GPa, and 4.7 MPa.m1/2, respectively. After thermal shock experiment, the phase composition of both YSZ coating and CeYSZ coating was T-ZrO2 + C-ZrO2, the thermal shock life of YSZ TBCs and CeYSZ TBCs was 370 times and 439 times, respectively, and their thermal shock failure modes were edge delamination. CeYSZ TBCs exhibited superior thermal shock resistance, which was because the CeO2 doping improved mechanical properties and reduced the growth rate of thermally grown oxide.