Self-lubricating epoxy-based composite abradable seal coating eliminating adhesive transfer via hierarchical design

作     者：Yun-qi Tong Wei Li Qiu-sheng Shi Lin Chen Guan-jun Yang Yun-Qi Tong;Wei Li;Qiu-Sheng Shi;Lin Chen;Guan-Jun Yang

作者机构：State Key Laboratory for Mechanical Behavior of MaterialsSchool of Materials Science and EngineeringXi’an Jiaotong UniversityXi’an 710049China AECC Hunan Aviation Powerplant Research InstituteZhuzhou 412002China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2022年第104卷第9期

页      面：145-154页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 0817[工学-化学工程与技术] 0806[工学-冶金工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0802[工学-机械工程] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：financially supported by the National Science and Technology Major Project(No.2017-VII-0012-0107) the National Program for Support of Top-notch Young Professionals。 

主　　题：Epoxy-based composite coating Hierarchical structure design Self-lubricating Pseudoplastic deformation 

摘      要：Aluminum-based composite abradable seal coatings are pivotal to improving the efficiency of aero engines or gas turbines.However,the adhesive transfer frequently occurs between metallic blade tips and aluminum-based composite coatings,resulting in engine vibration and even jam.Many past studies had tried to solve this problem by reducing coating hardness,improving lubrication,or strengthening blade tips,but all had failed.In this paper,we proposed a novel epoxy-based composite abradable seal coating,eliminating adhesive transfer by changing metal-to-metal scraping pair to metal-to-polymer scraping pair.The coating was developed via a hierarchical structure design.Large spherical pores were uniformly distributed in the continuous epoxy matrix with fine graphite dispersion.By adding 20 vol.%graphite and 50 vol.%hollow microspheres,a self-lubricating epoxy-based coating of 0.26 friction coefficient with thermal conductivity of 0.28 W/(m·K),coating HR15 Y hardness at 54.8,and bonding strength at 18.7 MPa can be reached.When the metallic blades scrape the epoxy-based composite coating,no adhesive transfer occurs.Besides,a smooth scraped surface is formed by pseudoplastic deformation.This epoxy-based composite abradable seal coating opens a new way to improve the efficiency and reliable operations of air engine compressors.