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Advanced Coatings for Wear and Corrosion Protection: On-Demand Poster Presentations
Program Organizers: Evelina Vogli, Flame Spray Inc.; Virendra Singh, Schlumberger

Friday 8:00 AM
October 22, 2021
Room: On-Demand Poster Hall
Location: MS&T On Demand

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Hot Corrosion Behavior of Yb₂O₃–Gd₂O₃–Y₂O₃ Co-Stabilized Zirconia in Thermal Barrier Coatings with a Lewis Neutral Layer: Junseong Kim¹; Dowon Song²; Guanlin Lyu³; Janghyeok Pyeon¹; SeungCheol Yang¹; Yeon-Gil Jung¹; ¹Department of Materials Convergence and System Engineering of Changwon National University; ²Hanyang University; ³Changwon National University
    Yb₂O₃–Gd₂O₃–Y₂O₃ co-stabilized ZrO₂ (YGYZ) coating with a Lewis neutral B–SiO₂ layer applied on the surface by a sol–gel-based glassification process was proposed. In this study, corrosion salts (Na₂SO₄ + V₂O₅) were deposited on the YGYZ coating with the B–SiO₂ layer to evaluate the hot corrosion behavior for various exposure times (20, 40, 80, 160, and 320 h) at 1100 °C. Microstructural analysis on the corroded coatings using SEM, EDS, and XRD shows that the B-SiO₂ layer prevented further infiltration of corrosion salts, resulting in the suppression of phase degradation. Moreover, the stronger basicity stabilizers in the YGYZ coating could sacrifice themselves to mitigate the invasion of corrosive salts. The thermal durability of the YGYZ coatings with the B–SiO₂ layer was twice that of 7-8 wt.% yttria-stabilized zirconia with the B–SiO₂ layer.

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