Influence of alumina addition on steam corrosion behaviour of ytterbium disilicates for environmental barrier coating applications

Ahmet Hilmi Paksoy, Joao Freitas Martins, Huatang Cao, Ying Chen, Grant Gibson, Ping Xiao (Corresponding)

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Abstract

The sintering and steam corrosion behaviour of Yb2Si2O7 with and without the addition of Al2O3 has been studied on compacted specimens. While, the addition of Al2O3 to Yb2Si2O7 enhanced the sintering of Yb2Si2O7 significantly, it also promoted the formation of a thin (80–100 nm), dense and protective Yb3Al5O12 layer at the Yb2Si2O7 surface when exposed to steam. TEM analysis confirmed that the Yb3Al5O12 layer is formed in steam environment via surface diffusion of aluminium from residual Al2O3 present on the surface of Al2O3/Yb2Si2O7 composite. These findings demonstrate the benefit of Al2O3 addition to protect environmental barrier coatings from steam corrosion.
Original languageEnglish
Article number110555
JournalCorrosion Science
Publication statusPublished - 2022

Keywords

  • Environmental barrier coatings
  • silicate
  • Sintering
  • steam corrosion

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