Molten‐Volcanic‐Ash‐Phobic Thermal Barrier Coating based on Biomimetic Structure. Issue 10 (2nd February 2023)

• Record Type: Journal Article
• Authors: Guo, Yiqian; Song, Wenjia; Guo, Lei; Li, Xinxin; He, Wenting; Yan, Xudong; Dingwell, Donald B.; Guo, Hongbo
• Is Part Of: Advanced science. Volume 10:Issue 10(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2023-02-02
• Subjects: biomimetic -- hierarchical structure -- thermal barrier coating -- volcanic ash -- wetting; Science -- Periodicals; 505
• DOI: 10.1002/advs.202205156
• Languages: English
• ISSNs: 2198-3844

Abstract

Abstract: Volcanic ash is a major threat to aviation safety. The softening/melting temperatures of volcanic ash lie far below typical aero‐engine operating temperatures. Thus, molten ash can accelerate the failure of thermal barrier coatings (TBCs). Here, inspired by natural superhydrophobic surfaces (e.g., the lotus leaf), a molten‐volcanic‐ash‐phobic TBC, which provides a large possibility to eliminate molten ash issues of TBCs, is developed. A hierarchically structured surface is first prepared on a (Gd0.9 Yb0.1 )2 Zr2 O7 (GYbZ) pellet by ultrafast laser direct writing technology, aiming to confirm the feasibility of the biomimetic microstructure to repel molten volcanic ash wetting. Then biomimetic‐structured GYbZ TBCs are successfully fabricated using plasma spray physical vapor deposition, which reveals "silicate" phobicity at high temperatures. The exciting molten‐volcanic‐ash‐phobic attribute of the designed surfaces is attributed to the lotus‐leaf‐like dual‐scale microstructure, emulating in particular the existence of nanoparticles. These findings may be an important step toward the development of next‐generation aviation engines with greatly reduced vulnerability to environmental siliceous debris. Abstract : The laser‐ablated (Gd0.9 Yb0.1 )2 Zr2 O7 (GYbZ) pellet and plasma spray physical vapor deposition GYbZ coating demonstrate volcanic ash phobicity at 1200 °C. The results highlight that the biomimetic hierachical structure consisting of microconical papillae with aspect ratio of 1.10 ± 0.15 and regularly distributed nanoparticles makes great contributions to silicate repellence.