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Research Article | Open Access

Corrosion resistance of non-stoichiometric gadolinium zirconate fabricated by laser-enhanced chemical vapor deposition

Chengguan ZHANG, Yun FAN, Juanli ZHAO, Guang YANG, Hongfei CHEN, Liangmiao ZHANG, Yanfeng GAO, Bin LIU( )
School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
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Abstract

Gadolinium zirconate (GZ) is a promising candidate for next-generation thermal barrier coating (TBC) materials. Its corrosion resistance against calcium–magnesium–alumino–silicate (CMAS) needs to be further increased for enhancing its in-service life. As the Gd element plays an important role in the CMAS resistance, three GZ coatings (GZ-0.75, GZ-1.0, and GZ-1.2) with different Gd/Zr atomic ratios are designed and deposited by laser enhanced chemical vapor deposition (LCVD) in this work. It is found that the generated Gd-apatite in GZ-1.2 would block micro-cracks inside the column structure and the inter-columnar gap more efficiently. Thus, the CMAS penetration rate (5.2 μm/h) of GZ-1.2 decreases over 27% comparing with GZ-1.0 and GZ-0.75, which is even lower than the Gd2Zr2O7 coatings fabricated by electron-beam physical vapor depositions (EB-PVDs). This work provides a feasible way to adjust the coating’s corrosion resistance and may guide the development of future coating for long in-service life.

Keywords

thermal barrier coating (TBC)gadolinium zirconate (GZ)nonstoichiometrycorrosion resistance

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Journal of Advanced Ceramics
Volume 10 Issue 3,
June 2021
Pages 520-528
DOI: 10.1007/s40145-020-0454-x
Cite this article:
ZHANG C, FAN Y, ZHAO J, et al. Corrosion resistance of non-stoichiometric gadolinium zirconate fabricated by laser-enhanced chemical vapor deposition. Journal of Advanced Ceramics, 2021, 10(3): 520-528. https://doi.org/10.1007/s40145-020-0454-x

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Received: 11 September 2020
Revised: 24 December 2020
Accepted: 24 December 2020
Published: 26 April 2021
© The Author(s) 2020

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