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- W4313597934 endingPage "141346" @default.
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- W4313597934 abstract "Lanthanum-cerium oxide derived high-entropy ceramics have been verified to be promising thermal barrier coatings (TBCs) materials for the protection of hot-end components in high-performance aero-engines/gas turbines. However, the dissatisfactory hot corrosion resistance of TBCs to Na2SO4 + V2O5 molten salt from fuel exhaust is identified as a crucial bottleneck. Herein, a stabilization element Nb is introduced into typical high-entropy cerates to strengthen the corrosion resistance. When corroded, it favors an intermittent generation of spindle-shaped corrosion products at grain boundary and effectively blocks the further penetration of corrosion medium. Compared with other constituent elements, Nb in the as-designed material presents a weak adsorption energy (-0.43 eV) with the final reaction intermediate of corrosion medium (VO43-). It yields an anchoring effect to stabilize the pristine crystal structure. What’s more, the differential charge density of Ce is highly influenced by Nb, leading to a strong interaction with VO43-. With Ce tightly adsorbed around the corrosion products, it cooperatively hinders the further infiltration of molten salts. These findings provide an interesting insight into the rational design of superior corrosion-resistant high-entropy TBCs." @default.
- W4313597934 created "2023-01-06" @default.
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- W4313597934 date "2023-02-01" @default.
- W4313597934 modified "2023-10-18" @default.
- W4313597934 title "Blocking effect in Nb-engineered high-entropy oxides with strengthened grain boundary corrosion resistance" @default.
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- W4313597934 doi "https://doi.org/10.1016/j.cej.2023.141346" @default.
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