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

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作  者:Yan Kang Lin Chen Guan-Jun Yang Chang-Jiu Li 

机构地区:[1]State Key Laboratory for Mechanical Behavior of Materials,School of Materials Science and Engineering,Xi’an Jiaotong University,Xi’an 710049,China

出  处:《Journal of Materials Science & Technology》2024年第25期240-250,共11页材料科学技术(英文版)

基  金:financially supported by the National Sci-ence and Technology Major Project(No.2017-VII-0012-0107);the Postdoctoral Innovative Talent Support Program(No.BX2021238);the National Natural Science Foundation of China(No.U22A20110).

摘  要: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.

关 键 词:Abradable seal coatings Abradability Bonding strength Blade tip Hollow spheres 

分 类 号:TG1[金属学及工艺—金属学]

 

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