Hot-corrosion resistance and phase stability of Yb2O3–Gd2O3–Y2O3 costabilized zirconia-based thermal barrier coatings against Na2SO4 + V2O5 molten salts

作者: Dowon Song , Taeseup Song , Ungyu Paik , Guanlin Lyu , Junseong Kim

DOI: 10.1016/J.SURFCOAT.2020.126197

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摘要: Abstract The hot corrosion behavior of plasma-sprayed Yb2O3-Gd2O3-Y2O3 co-doped ZrO2 (YGYZ) coating against Na2SO4 + V2O5 molten salts was investigated and its detailed mechanism suggested. chemical reactivity order between the stabilizers proposed based on electronic structure Lewis acid-base mechanism. After corrosion, YGYZ exhibited maintenance tetragonality ratio relatively lower extent destabilization less than 40% conventional yttria-stabilized coating. These great phase stabilities imply that is promising candidate for high-temperature thermal barrier material.

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