Hot corrosion of V2O5-coated NdMgAl11O19 ceramic in air at 950 °C

NdMgAl11O19 ceramic was prepared by solid-state reaction at 1700 °C for 10 h in air, and exhibited a single phase of magnetoplumbite structure. Reaction between molten V2O5 and NdMgAl11O19 was investigated at 950 °C using an X-ray diffractometer, scanning electron microscopy and energy-dispersive X-ray spectroscopy. Molten V2O5 reacts with NdMgAl11O19 to form α-Al2O3, NdVO4 and MgAl2O4 at 950 °C in air. After hot corrosion at 950 °C for 50 h, α-Al2O3 is the main corrosion product. The thickness of the corrosion layer gradually increases with increasing corrosion time from 10 to 50 h.