| Abstract Scope |
Thermal barrier coatings (TBCs) with low thermal conductivity and good corrosion resistance to calcium-magnesium-alumino-silicates (CMAS) are important materials for the protection of the metallic parts or ceramic matrix composites from overheating during long-term use at high temperatures. Yttria-stabilized zirconia (YSZ) is the state-of-the-art TBC material and has been chosen as the industry standard. Great efforts have been devoted to explore new oxide compositions with lower thermal conductivity and better thermal stability for TBC applications in recent years. The A2B2O7-type rare-earth zirconates with pyrochlore structure are important candidates. Here, we report the preparation and characterization of high-entropy pyrochlores based on ternary rare-earth zirconates (RE2Zr2O7). Five lanthanides (La2O3, Nd2O3, Sm2O3, Eu2O3, and Gd2O3) and Y2O3 were selected as the starting materials. The thermal conductivity, thermal stability at elevated temperatures, thermal cycling test of the coatings prepared by atmospheric plasma spraying (APS), as well as corrosion resistance to CMAS were investigated and discussed. |