Core-shell Structured YSZ/CeO₂ Composite Thermal Barrier Coating Fabrication and Properties

Abstract

In this study, we researched changes in the properties of a Thermal Barrier Coating depending on the powder structure. For this purpose, we used YSZ (Yttria Stabilized Zirconia), a commercial Thermal Barrier Coating material, to produce a powder with a Core-Shell structure. Bulk samples were prepared by hot pressing to analyze their properties according to the powder structure, and Thermal Barrier Coating samples were prepared by APS (Atmospheric Plasma Spray) to compare differences in properties according to the powder structure. The results of the bulk sample analysis showed that the thermal conductivity of YSZ was 3~4.2 W/m*K, the CeO₂ mixed structure was 2.2~3.3 W/m*K, and the Core-Shell Composite was 2.2~2.9 W/m*K. The thermal Barrier Coating sample analysis showed that the TGO growth behavior was different depending on the powder structure. The YSZ coating sample was 7.24 µm, the YSZ+CeO₂ coating sample was 6.68 µm, and the Core-Shell coating sample was 4.79 µm. In the case of high-temperature thermal conductivity, YSZ and YSZ+CeO₂ showed similar results, but the Core-Shell coating sample had 79.07% thermal conductivity, compared to YSZ at 1000℃. These results indicate that the core-shell composite has improved thermal insulation performance and mechanical properties compared to YSZ, and it is expected that the core-shell composite will exhibit improved thermal properties compared to YSZ when applied to Thermal Barrier Coating.