Durability of the Zirconia based Coatings in Contact with Manganese Oxide at 1273 K

The phase transformation and reaction of ZrO₂-CaO- ZrSiO₄ and ZrO₂-Y₂O₃-ZrSiO₄ coatings with manganese oxide at 1273 K were investigated using X-ray diffraction (XRD) and scanning electron microscopy (SEM). SiO₂ phase formed in the coatings, which was from the ZrSiO₄ decomposed and easy react with manganese oxide or CaO. SiO₂ has precedence over react with CaO than manganese oxides for ZrO₂-CaO-ZrSiO₄ coatings, and which result in to promote t-m phase transformation. On the contrary, the reaction between SiO₂ and MnO is primary for the ZrO₂-Y₂O₃-ZrSiO₄ coatings and result in the damage or exfoliation on the surface of the coatings.