Chemical Stability between NiCr₂O₄ Material and Molten Calcium-Magnesium-Alumino-Silicate (CMAS) at High Temperature.

NiCr₂O₄ as a potential protection for thermal barrier coatings (TBCs) against the attack of molten calcium-magnesium-alumino-silicate (CMAS) was studied by a CMAS-contacting experiment. Atmospheric plasma sprayed coatings and sintered bulk materials were fabricated, covered with CMAS deposits, and exposed to 1200 °C for 24 h. Nano-sized CMAS-NiCr₂O₄ mixed powder was manufactured by ball milling and then conducted heat treatment under the same condition. The results show that no reacting product was found at the border between molten CMAS and NiCr₂O₄ and no element transportation occurred. It can be inferred that NiCr₂O₄ has outstanding chemical stability with the molten CMAS.