In this study, thermal barrier coatings (TBC) consisting of 3.5 mol% Yb2O3-stabilized ZrO2 co-doped with 1 Gd2O3 and Yb2O3 (referred to as GdYb-YSZ) were fabricated by means air plasma spraying. The as-fabricated exhibited a metastable tetragonal (t′) structure. hot-corrosion behavior the GdYb–YSZ TBCs was investigated at 700, 800, 900, 1000 °C for 10 h in presence V2O5 molten salt. During corr...