117 / 2024-10-15 13:26:28

Thermal, mechanical and CMAS corrosion resistant properties of novel YbTaO4 thermal barrier coatings

YbTaO4,CMAS,TBCs,wettability

YbTaO₄ was investigated as the potential novel thermal barrier material to enhance the CMAS corrosion resistance of YSZ TBCs for aeroengine or space engine. Research results indicate that the thermal conductivity(800℃), thermal expansion coefficient(1000℃), and fracture toughness of YbTaO₄ is ~58%, ~75%, and ~41% than that of YSZ, respectively. Moreover, the wettability of YbTaO₄ is worse than YSZ, which can enhance the CMAS corrosion resistance of TBCs at real operating environment. YbTaO₄ exhibits excellent CMAS corrosion resistance, the reaction layer thickness at 1250℃ and 1350℃ after 10 h reaction is ~5μm and ~ 13μm, which is significantly thinner than thickness of YSZ after CMAS corrosion(~ 450μm, 4h). In summary, YbTaO₄ is a kind of potential novel thermal material to replace or protect YSZ.