Effect of co-doping of CeO₂ and Sc₂O₃ on mechanical properties and CMAS corrosion resistance of YSZ ceramics

Abstract Given the escalating demand for advanced materials capable of withstanding extreme temperatures in the aerospace and automotive industries, the development of enhanced thermal barrier coatings is critical. This study introduces a novel thermal barrier coating material synthesized via the co-doping of yttria-stabilized zirconia (YSZ) ceramics with ceria (CeO 2 ) and scandia (Sc 2 O 3 ). The aim is to enhance mechanical properties and resistance to calcium-magnesium-alumino-silicate (CMAS) corrosion, both crucial for high-temperature applications in aerospace and automotive industries. Through a comprehensive experimental approach involving solid-phase sintering, microhardness, fracture toughness, and nanoindentation tests, the research evaluates the effects of co-doping on the ceramics’ performance. Results demonstrate that CeO 2 and Sc 2 O 3 co-doping remarkably improves the corrosion resistance of CMAS and mechanical properties of YSZ, suggesting potential for next-generation thermal barrier coatings in high-temperature environments.