Al-modified environmental barrier coatings for protection against water vapor corrosion
High-temperature water vapor corrosion is a great challenge for long lifetime of Si/mullite/Yb2SiO5 Environmental Barrier Coatings. In this work, the Yb3Al5O12 modified layer was in-situ synthesized on the surface of Yb2SiO5 layer to improve the steam resistance. The reaction mechanism of the Al-mod...
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Published in | Corrosion science Vol. 217; p. 111123 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier Ltd
01.06.2023
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Subjects | |
Online Access | Get full text |
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Summary: | High-temperature water vapor corrosion is a great challenge for long lifetime of Si/mullite/Yb2SiO5 Environmental Barrier Coatings. In this work, the Yb3Al5O12 modified layer was in-situ synthesized on the surface of Yb2SiO5 layer to improve the steam resistance. The reaction mechanism of the Al-modified layer was explored. The steam corrosion experimental results indicated that the defects in Yb2SiO5 layer healed, and the oxidation rate of Si-bonded coating was slowed down under the protection of modified layer. Additionally, the calculation results of first-principle molecular dynamics confirmed that Yb3Al5O12 has excellent steam corrosion resistance.
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•A protective layer was prepared on the surface of the Yb2SiO5 coating through the Al-modification method.•The reaction of Yb3Al5O12 with water vapor needs to break through a higher energy barrier than that of Yb2O3 and Yb2SiO5 at 1400 ℃.•The Al-modified EBCs exhibited excellent water vapor corrosion resistance due to the formation of a new Yb3Al5O12 phase as well as the healing of voids and microcracks in the Yb2SiO5 coating. |
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ISSN: | 0010-938X 1879-0496 |
DOI: | 10.1016/j.corsci.2023.111123 |