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<p>In this study, the Air Plasma Spray (APS) technology was used to spray YSZ:Eu, YSZ:Er, and YSZ:Dy powders respectively onto nickel-based alloys as ceramic layers to prepare multi-element rare earth doped yttria stabilized zirconia (YSZ) thermal barrier coatings (TBCs) with gradient directions (YSZ:Ln, Ln = Eu,Er, Dy). The traditional YSZ TBCs were also prepared. The thermal conductivities of the two different coatings were tested using a flash thermal conductivity meter. The thickness and morphology changes of the thermally grown oxide (TGO) were observed to achieve the intrinsic performance comparison. The results show that doping with rare earths effectively reduces the thermal conductivity of the coating and directly affects the growth of TGO. Subsequently, through conducting thermal aging tests at 1100 ℃ for 0–50&#xa0;h and fluorescence spectroscopy tests, the influence of the microstructure of the coating and element diffusion on the fluorescence spectrum intensity was also analyzed. This approach aims to reflect the health status of the coating by utilizing the fluorescence characteristics of rare earth elements, providing a non-destructive testing method. The results show that the fluorescence intensity increases and reaches the maximum value after 0–10&#xa0;h of heat treatment. From 10 to 50&#xa0;h, the fluorescence intensity shows a decrement tendency. The growth of rare earth element grains and the diffusion of metallic elements in the bond coat are the reasons affecting the variation of fluorescence intensity. Finally, the fluorescence intensity changes of the damaged YSZ:Ln and the intact YSZ:Ln were analyzed. It was observed that the fluorescence intensity of the coating with internal damage would increase because of the principle of fluorescence interface enhancement.</p>

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Study on the effect of multi-rare-earth-doping on thermal barrier coatings’ thermophysical and fluorescence properties

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月17日

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  • Yankuan Liu,
  • Ze Liu,
  • Yujie Fei,
  • Chenghao Wang,
  • Heran Yang

摘要

In this study, the Air Plasma Spray (APS) technology was used to spray YSZ:Eu, YSZ:Er, and YSZ:Dy powders respectively onto nickel-based alloys as ceramic layers to prepare multi-element rare earth doped yttria stabilized zirconia (YSZ) thermal barrier coatings (TBCs) with gradient directions (YSZ:Ln, Ln = Eu,Er, Dy). The traditional YSZ TBCs were also prepared. The thermal conductivities of the two different coatings were tested using a flash thermal conductivity meter. The thickness and morphology changes of the thermally grown oxide (TGO) were observed to achieve the intrinsic performance comparison. The results show that doping with rare earths effectively reduces the thermal conductivity of the coating and directly affects the growth of TGO. Subsequently, through conducting thermal aging tests at 1100 ℃ for 0–50 h and fluorescence spectroscopy tests, the influence of the microstructure of the coating and element diffusion on the fluorescence spectrum intensity was also analyzed. This approach aims to reflect the health status of the coating by utilizing the fluorescence characteristics of rare earth elements, providing a non-destructive testing method. The results show that the fluorescence intensity increases and reaches the maximum value after 0–10 h of heat treatment. From 10 to 50 h, the fluorescence intensity shows a decrement tendency. The growth of rare earth element grains and the diffusion of metallic elements in the bond coat are the reasons affecting the variation of fluorescence intensity. Finally, the fluorescence intensity changes of the damaged YSZ:Ln and the intact YSZ:Ln were analyzed. It was observed that the fluorescence intensity of the coating with internal damage would increase because of the principle of fluorescence interface enhancement.