Functional Nano Structure Materials Lab. Publication

International Journal

Hot corrosion behavior of Yb2O3–Gd2O3–Y2O3 co-stabilized zirconia-based thermal barrier coatings with a Lewis neutral layer
Journal
Surface and Coatings Technology
Author
Junseong Kim, Dowon Song, Guanlin Lyu, Janghyeok Pyeon, SeungCheol Yang, JongkeeAhn, SungchulAhn, Yeon-GilJung, Byung-il Yang
Year
2021
Date
2021.12.25
File
Hot corrosion behavior of Yb2O3–Gd2O3–Y2O3 co-stabilized zirconia-based thermal barrier coatings with a Lewis neutral layer.pdf (10.1M) 11회 다운로드 DATE : 2021-11-30 09:04:16
In this study, we designed a thermal barrier coating (TBC) system—Yb2O3–Gd2O3–Y2O3 co-stabilized ZrO2 (YGYZ) coating—with a Lewis neutral B–SiO2 layer applied on its surface via a sol–gel-based glassification process and investigated its long-term corrosion resistance under corrosive environments. The corrosion behavior of the B–SiO2-covered YGYZ coating was assessed after 20, 40, 80, 160, and 320 h exposure to a hot corrosive environment of Na2SO4 + V2O5 at 1100 °C. Results indicated that the B–SiO2 layer effectively prevented the penetration of corrosive salts and formation of m-ZrO2 phase in the coating layer as well as generated vertical cracks that could release the residual stress. Therefore, it is concluded that depositing a Lewis neutral B-SiO2 layer on YGYZ coatings is highly beneficial for extending the lifetime of the TBCs.