Simultaneously improving strength and abradability for abradable seal coatings by localized bonding hollow spheres

doi:10.1016/j.jmst.2023.12.067

Abstract

Abstract: To solve the long-standing contradiction between the bonding strength and abradability of an abradable seal coating (ASC), a novel spherical closed-pore structure was proposed. The new structure consisted of three discontinuous phases, including locally enriched metals, hollow thin-shell spheres, and pores. The results show that the bonding strength of the abradable seal coating reaches 25.4 MPa, and the abrasion ratio between the coating and blade tip, as a characteristic of the abradability of ASCs, is > 5900. The dewetting kinetics of the metal film on the ceramic sphere were calculated. The size of the shrink metal hemisphere is 3.6 times the metal film thickness. The locally enriched metal enables a high bonding strength, while the fragmentation of the hollow thin-shell spheres enhances the abradability, thus simultaneously improving the strength and abradability. The coating is expected to be used in next-generation turbines to improve efficiency and stability.

Key words: Abradable seal coatings, Abradability, Bonding strength, Blade tip, Hollow spheres

Yan Kang, Lin Chen, Guan-Jun Yang, Chang-Jiu Li. Simultaneously improving strength and abradability for abradable seal coatings by localized bonding hollow spheres[J]. J. Mater. Sci. Technol., 2024, 192: 240-250.

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