Water vapor corrosion behaviours of nanostructured Yb2O3-Yb2SiO5/mullite/Si environmental barrier coatings

Fei Xiao, Mufu Yan, You Wang, Shawei Tang*, Ming Liu*, Xiaodong Zhang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

In this work, the nanostructured Yb2O3-Yb2SiO5/mullite/Si environmental barrier coatings (EBCs) were designed and prepared by atmospheric plasma spraying. The water vapor corrosion behavior of coatings was investigated at a temperature of 1350 °C for durations ranging from 100 to 500 h, and the influence of phase compositions, microstructure on this behavior was systematically investigated. The results indicate that phase transformation occurs during the water vapor corrosion process, and severe corrosion takes place at the Yb2O3-Yb2SiO5 top coating and the mullite intermediate layer. Obvious diffusion reaction between Yb2O3-Yb2SiO5 and mullite layers occurred without water vapor, while the diffusion reaction cannot be observed under water vapor. The water vapor corrosion mechanism of EBCs is mainly attributed to residual thermal mismatch stresses, phase transformation resulting from sintering of Yb2O3-Yb2SiO5, as well as the formation of TGO by oxidation.

Original languageEnglish
Pages (from-to)279-289
Number of pages11
JournalCeramics International
Volume51
Issue number1
DOIs
Publication statusPublished - Jan 2025
Externally publishedYes

Keywords

  • Atmospheric plasma spraying
  • High temperature water vapor corrosion
  • Nanostructured EBCs
  • YbO-YbSiO

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Xiao, F., Yan, M., Wang, Y., Tang, S., Liu, M., & Zhang, X. (2025). Water vapor corrosion behaviours of nanostructured Yb2O3-Yb2SiO5/mullite/Si environmental barrier coatings. Ceramics International, 51(1), 279-289. https://doi.org/10.1016/j.ceramint.2024.10.456