Degradation of CeO2 and TiO2 co-stabilized ZrO2 by the V2O5 molten salts and Na2SO4 + V2O5 molten salts

In this study, (Ce 0.15 Ti 0.05 )Zr 0.80 O 2 (CTZ) with the tetragonal (t) phase was fabricated by solid-state reaction, and the destabilization resistance of CTZ ceramic was investigated in V 2 O 5 , and Na 2 SO 4 + V 2 O 5 molten salts , respectively. After CTZ was corroded in V 2 O 5 molten salt at 700 °C for 2 h, ZrV 2 O 7 and CeVO 4 were formed, and the t phase was the main crystalline phase on the CTZ surface. After CTZ was corroded in V 2 O 5 molten salt at 800 °C or 900 °C for 2 h, the amount of CeVO 4 increased significantly, and CTZ surface underwent a more corrosion degradation than at 700 °C. After CTZ was corroded in Na 2 SO 4 + V 2 O 5 molten salts at 700 °C or 800 °C for 2 h, the hot corroded products were m-ZrO 2 and CeVO 4 . However, after CTZ was corroded in Na 2 SO 4 + V 2 O 5 molten salts at 800 °C for 10 h or 900 °C for 2 h or 10 h, a new phase of CeO 2 was formed due to the mineralization effect. The destabilization of CTZ ceramic under hot corrosion was mainly caused by the chemical interaction and phase transformation. • The destabilization of CTZ ceramic was mainly caused by the chemical interaction and phase transformation. • Corrosion products and corrosion degree are closely related to the type of corrosion salts, the corrosion temperature and heat duration. • The morphologies of CeVO 4 exhibited significant difference. It evolved from the V 2 O 5 corrosion environment is polyhedral, while it was rod-like in the Na 2 SO 4 +V 2 O 5 corrosion environment.