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Thermal insulation performance of 7YSZ TBCs adjusted via Al modification

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Abstract

ZrO2-7 wt% Y2O3 (7YSZ) thermal barrier coatings (TBCs) with three different structures were prepared by atmospheric plasma spraying (APS), electron beam physical vapor deposition (EB-PVD) and plasma spray-physical vapor deposition (PS-PVD). Al films were deposited onto the top 7YSZ TBCs by magnetron sputtering, and the Al-deposited 7YSZ TBCs were subjected to vacuum heat treatment. The effects of Al modification on the thermal insulation properties of 7YSZ TBCs were investigated. The results showed that Al modification could significantly improve the thermal insulation of 7YSZ TBCs at 1000 °C. Moreover, the maximum improvement of thermal insulation for PS-PVD 7YSZ TBCs was approximately 100 °C, but the improvement decreased with increasing temperature. This is mainly because with increasing temperature, the rate of radiation heat transfer increases, and the effects of convection heat transfer and thermal conductivity on thermal insulation are weakened. At the same temperature, Al modification of PS-PVD 7YSZ TBCs provides better temperature insulation than those of APS 7YSZ TBCs and EB-PVD 7YSZ TBCs because of its wider and deeper inter-columnar gaps. When the temperature was 1200 °C, Al modification still caused a good insulation effect in PS-PVD 7YSZ TBCs; the improvement was approximately 50 °C, but in APS and EB-PVD 7YSZ TBCs, the insulation effect disappeared.

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摘要

采用大气等离子喷涂(APS)、电子束物理气相沉积(EB-PVD)和等离子喷涂-物理气相沉积(PS-PVD)技术制备了三种不同结构的ZrO2-7wt% Y2O3 (7YSZ)热障涂层。采用磁控溅射法在7YSZ 热障涂层顶部沉积铝膜，并对涂层进行真空热处理。研究了铝改性对7YSZ 热障涂层隔热性能的影响。结果表明，当温度为1000 °C时，Al改性可显著提高7YSZ 热障涂层的隔热性能。且对PS-PVD 7YSZ 热障涂层隔温提升最大，达到近100 °C，但随着温度的升高，隔温减小。这主要是因为随着温度的升高，辐射换热比例增加，对流换热和导热对隔温的影响减弱。在相同的温度下，PS-PVD 7YSZ 热障涂层的铝改性比APS 7YSZ和EB-PVD 7 YSZ 热障涂层提供更好的隔温，因为其柱间间隙更宽更深。当温度为1200 °C时，Al改性对PS-PVD 7YSZ热障涂层仍有良好的隔温作用，隔温大约50 °C，但是对APS和EB-PVD 7YSZ 热障涂层，则没有起到隔温作用。

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Acknowledgements

This study was financially supported by the National Natural Science Foundation of China (Nos. 51801034 and 52172067), Guangdong Province Outstanding Youth Foundation (No. 2021B1515020038), Guangdong Special Support Program (No. 2019BT02C629), Key R & D project in ShanXi Province (No. 2019ZDLGY01-07), and Guangdong Academy of Sciences Program (No. 2020GDASYL-20200104030).

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  1. Institute of New Materials, The Key Lab of Guangdong for Modern Surface, Engineering Technology, Guangdong Academy of Sciences, National Engineering Laboratory of Modern Materials Surface Engineering Technology, Guangzhou, 510651, China

    Jun-Gui Zhang, Xi Tan, Xiu-Juan Fan, Jie Mao, Chun-Ming Deng, Min Liu, Ke-Song Zhou & Xiao-Feng Zhang

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  1. Jun-Gui Zhang
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Zhang, JG., Tan, X., Fan, XJ. et al. Thermal insulation performance of 7YSZ TBCs adjusted via Al modification. Rare Met. 42, 994–1004 (2023). https://doi.org/10.1007/s12598-022-02221-9

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