Phase Formation and Thermo-physical Properties of GdO 1.5 -ZrO 2 System for Thermal Barrier Coating Application

Gadolinium zirconate, Gd₂Zr₂O 7 , is one of the most promising candidates for replacing yttira-stabilized zirconia (YSZ) in thermal barrier coating (TBC) applications due to its low thermal conductivity and chemical stability at high temperature. In this study, rareearth zirconate ceramics in the GdO 1.5 -ZrO₂ system with reduced gadolinia contents were fabricated via solid-state reaction as well as hot-pressing at 1800℃. The phase formation, microstructure, and thermo-physical properties of these oxides were examined. The potential application of GdO 1.5 -ZrO₂ ceramics for TBC was also discussed.