Hot corrosion behaviour of Yb2Zr2O7 ceramic coated with V2O5 at temperatures of 600–800 °C in air

To better understand the hot corrosion behaviour of Yb2Zr2O7 ceramic in molten V2O5, hot corrosion experiments were performed in a temperature range of 600–800 °C in air. Different reaction products of ZrV2O7, YbVO4 and m-ZrO2 were identified depending upon the hot corrosion conditions, for example, ZrV2O7 and YbVO4 at 600 °C for 2 h and 8 h; ZrV2O7, m-ZrO2 and YbVO4 at 700 °C for 2 h; m-ZrO2 and YbVO4 either at 800 °C for 2 h or at 700–800 °C for 8 h. The hot corrosion reaction mechanisms were further discussed based on the thermal instability of ZrV2O7 at elevated temperatures.