Composition-structure-property synergistically tailoring of Zr-Y-Ta-O oxides as candidate abradable seal coatings materials

To explore novel abradable seal coatings (ASCs) materials with high working temperatures and excellent performance, we reported the multicomponent Zr-Y-Ta-O oxides with improved properties in ZrO2-YO1.5-TaO2.5 ternary diagram. Six Zr-Y-Ta-O oxides with different components were successfully synthesized by a solid-state reaction, and we elucidated their composition-structure-property relationship. The origins of glass-like thermal conductivity and high toughness were discussed from structural characteristics, and wear resistance was measured by nanoindentation. The high concentration of oxygen vacancies, effective inhibitions of high-temperature thermal radiation, and mitigation of phonon speed simultaneously contributed to the low and glass-like thermal conductivity (1.04-1.43 W center dot m(-1)center dot K-1, 900 degrees C). Furthermore, the high thermal expansion coefficients and excellent phase stability indicated that their working temperatures were as high as 1400 degrees C. The studied Zr-Y-Ta-O oxides can be applied as candidate high-temperature ASCs materials with improved performance.