Investigation into the adhesion behavior of high-temperature CMAS melt on Yb2SiO5 surface

Yb 2 SiO 5 ceramics, serving as a new-generation material for environmental barrier coatings (EBCs) on the hot-end components of aero-engines, encounter challenges of high-temperature infiltration and corrosion from CaO-MgO-Al 2 O 3 -SiO 2 (CMAS) melts during operation. In this study, femtosecond laser micro-nano processing technology was used to construct periodic bulk structures and conical structures on the surface of Yb 2 SiO 5 . The design of both structures can significantly increase the surface roughness. Among them, after the conical structure was modified by femtosecond laser technology, the proportion of non-polar C C bonds on the surface increased from 69% to 75%. Benefiting from the combined effect of the microstructure and special chemical groups, the surface of the periodic conical structure achieves hydrophobicity, with a static contact angle of 135.2°. At high temperatures, the initial contact angle of the CMAS melt on the conical structure is 83°, which is close to the Cassie-Baxter state, and the stable contact angle is 28°, which is 2.3 times that of the original surface (12°). In addition, after 6 h of CMAS corrosion at 1250 °C, the conical structure still showed clear contours and skeletons, which also proves that the preparation of periodic microstructures by femtosecond laser technology can improve the CMAS resistance to wetting and corrosion performance. The results of this study provide valuable insights and a basis for the research on the resistance of Yb 2 SiO 5 coatings to high-temperature adhesion and corrosion of CMAS melts.