Influence of Iron Oxide Deposits on the Hot Corrosion Resistance of YSZ Thermal Barrier Coatings in Molten Vanadium Pentoxide

• DOI: 10.1002/maco.202414673
• Publication Date: 2025-03-17T07:19:17Z
• Authors: José Andrés Gómez; Jhonattan de la R...; Pablo Gómez; Alejandro Toro
• Keywords: Pentoxide

ABSTRACT The effect of iron oxide (Fe₂O₃) deposits on the hot corrosion (HC) mechanisms yttria‐stabilized zirconia (YSZ) thermal barrier coatings in presence vanadium was investigated. experiments involved exposing YSZ samples to pentoxide (V₂O₅) at 900°C for 90 min, both with and without addition Fe₂O₃. Surface cross‐sectional analyses were conducted using optical microscopy, scanning electron microscopy (SEM/EDS), X‐ray diffraction. Additionally, porosity delamination percentages quantified through digital image processing techniques. primary damage identified included yttria dissolution, which facilitated tetragonal‐to‐monoclinic phase transformation YSZ, as well infiltration V₂O₅ cracks pores, leading coating near Top Coat/Bond Coat (TC/BC) interface. Notably, Fe₂O₃ reacted during tests, forming an iron‐vanadium (FeV₃O₈). Furthermore, increases HC attack, reducing tetragonal content coating.