Journal
CORROSION SCIENCE
Volume 207, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2022.110564
Keywords
Environmental barrier coatings; High-entropy rare-earth monoslicates; Vacuum plasma spray; Rare-earth ionic radius; CMAS corrosion mechanisms
Funding
- National Science and Technology Major Project [2017-VI-0020-0092]
- Shanghai Sailing Program [19YF1453900]
- Natural Science Foundation of Shanghai [20ZR1465700]
- Basic Research of the Ministry of Science and Tech-nology of the Chinese Academy of Sciences [CXJJ-21S029]
- Science Fund of Shandong Laboratory of Advanced Materials and Green Manufacturing (Yantai) [AMGM2021A09]
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In this study, the CMAS corrosion behavior of high-entropy monosilicate coatings and Y2SiO5 coating was investigated and compared. The results showed that the high-entropy coatings exhibited improved corrosion resistance, which could be attributed to the doped rare-earth elements enhancing the stability of crystal structure and facilitating the formation of garnet phase.
The high-entropy design of rare-earth silicates has been expected to improve CMAS corrosion resistance, which is essential to the development of EBCs for aero-engines. In this work, CMAS corrosion behaviors of plasma-sprayed high-entropy monoslicates ((Lu0.25Yb0.25Er0.25Y0.25)(2)SiO5 and(Lu0.2Yb0.2Er0.2Ho0.2Y0.2)(2)SiO5) and Y2SiO5 coatings at 1350 C for 25-50 h were investigated and compared. The corrosion products included apatite and garnet based on the dissolution-reprecipitation mechanism. The high-entropy coatings possessed improved corrosion resistance compared with the Y2SiO5 coating, which was mainly due to the doped RE elements with smaller ionic radius could improve the stability of crystal structure and form garnet phase more easily.
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