Phase and microstructure evolution of SrCeO3 ceramic when exposed to molten V2O5 at 700–1250 ºC

Highlights: • At 700 °C or 900 °C, V₂O₅ reacted with SrCeO₃ ceramic to form Sr₂V₂O₇, CeO₂ and CeVO₄. • At 1250 °C, the main corrosion products were Sr₃V₂O₈ and CeO₂. • The corrosion zone comprised of several regions, each with a different composition. • The hot corrosion mechanism was explained by phase diagram and lewis acid-base rule. • A model describing the formation of the corrosion zone was established. Hot corrosion behaviour of SrCeO₃ ceramic in molten V₂O₅ was studied at 700–1250 °C. Sr₂V₂O₇, CeO₂ and CeVO₄ were the main reaction products at 700 °C and 900 °C, while only Sr₃V₂O₈ and CeO₂ can be detected at 1250 °C. The corrosion zone was divided into several layers. Both the structure and composition of the corrosion zones were dependent on the corrosion temperature. The microstructure of corrosion zone appeared to have evolved in two major stages, including a first dissolve-precipitation process and a subsequent grain boundary attack process. Finally, a model describing the formation of the corrosion layer was established.