Journal
CORROSION SCIENCE
Volume 207, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2022.110555
Keywords
Environmental barrier coatings; Silicate; Sintering; Steam corrosion
Funding
- Royal Academy of Engineering and Rolls -Royce for the appointment of Rolls-Royce/Royal Academy of Engineering Research Chair in Advanced Coating Technology
- Scientific and Technological Research Council of Turkey (TUBITAK)
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The sintering and steam corrosion behavior of Yb2Si2O7 were studied with and without the addition of Al2O3. The addition of Al2O3 significantly improved the sintering of Yb2Si2O7 and also promoted the formation of a thin and dense Yb3Al5O12 protective layer against steam corrosion.
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.
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