Hot corrosion resistance of oxide‐doped yttria‐stabilized zirconia powder in V₂O₅ molten salt

The hot corrosion resistance of 8 wt.% yttria‐stabilized zirconia (8YSZ) powder, modified with CaO, MgO, Ta 2 O 5 , and TiO 2 at concentrations of 5, 10, and 15 wt.%, was systematically investigated in a molten vanadium pentoxide (V 2 O 5 ) environment at 900°C and 1100°C for 48 h. The modified 8YSZ samples, coated with V 2 O 5 , underwent thermal cycling totaling 12 cycles. Results revealed susceptibility to hot corrosion for all doped 8YSZ powders, attributed to tetragonal ZrO 2 destabilization, forming monoclinic ZrO 2 . Remarkably, 8YSZ/CaO demonstrated exceptional resistance to hot corrosion when exposed to a temperature of 900°C. The corrosion product found in the 8YSZ/Ta 2 O 5 material was determined to be tetragonal Zr 0.66 Y0.17Ta 0.17 O 2 . Although, 8YSZ/TiO 2 undergoes deterioration at 900°C, it exhibits improved resistance at 1100°C, resulting in the formation of TiVO 4.