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

Song, Dowon; Song, Taeseup; Paik, Ungyu; Lyu, Guanlin; Kim, Junseong; Yang, SeungCheol; Jung, Yeon-Gil

doi:10.1016/j.surfcoat.2020.126197

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

Song, Dowon;
Song, Taeseup;
Paik, Ungyu;
Lyu, Guanlin;
Kim, Junseong;
외 2명

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47

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58

초록

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 hot corrosion mechanism was suggested. The chemical reactivity order between the stabilizers was proposed based on the electronic structure and Lewis acid-base mechanism. After hot corrosion, the YGYZ coating exhibited the maintenance of tetragonality ratio and relatively lower extent of destabilization less than 40% of conventional yttria-stabilized ZrO2 coating. These great chemical and phase stabilities imply that YGYZ is promising candidate for high-temperature thermal barrier material.

키워드

Hot corrosion; Rare-earth element; Thermal barrier coatings (TBC); Reaction mechanism; MECHANICAL-PROPERTIES; STRONTIUM ZIRCONATE; DEGREES-C; CONDUCTIVITY; ZRO2; YSZ; CERAMICS; BEHAVIOR; MICROSTRUCTURE; DEGRADATION

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

저자: Song, Dowon; Song, Taeseup; Paik, Ungyu; Lyu, Guanlin; Kim, Junseong; Yang, SeungCheol; Jung, Yeon-Gil

DOI: 10.1016/j.surfcoat.2020.126197

발행일: 2020-10

유형: Article

저널명: Surface and Coatings Technology

권: 400

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