Tribological properties of polyimide composites reinforced with fibers rubbing against Al_(2)O_(3)  

作　　者：Huimin QI Ga ZHANG Zhiqin ZHENG Jiaxin YU Chao HU 

机构地区：[1]Key Laboratory of Testing Technology for Manufacturing Process in Ministry of Education,State Key Laboratory of Environment-friendly Energy Materials,Southwest University of Science and Technology,Mianyang 621010,China [2]State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China [3]Qingdao Center of Resource Chemistry&New Materials,Qingdao 266071,China [4]Fundamental Science on Nuclear Wastes and Environmental Safety Laboratory,Southwest University of Science and Technology,Mianyang 621010,China

出　　处：《Friction》2021年第2期301-314,共14页摩擦（英文版）

基　　金：The authors are grateful for the financial support received from National Natural Science Foundation of China(Grant Nos.51475446 and 51975492);the Research Foundation of Southwest University of Science and Technology(Grant Nos.18zx7162 and 18zx7125);Sichuan Science and Technology Program(Grant No.18YYJC0905).

摘　　要：Reinforcing fillers are of great importance in tribological performance and tribofilm formation of polymeric composites.In this study,the tribological properties of aramid particle(AP)and short carbon fiber(SCF)reinforced polyimide(PI)composites were added to hexagonal boron nitride(h-BN),and silica(SiO_(2))nanoparticles sliding against alumina were comprehensively investigated.When sliding occurred with AP-reinforced PI composites,the tribological properties were not closely depended on the pressure×velocity(p×v)factors and the nanoparticles.The interactions between AP and its counterpart could not induce tribo-sintering of the transferred wear debris.As such,the tribofilm seemed to be in a viscous state,leading to higher friction and wear.However,the inclusion of hard SCF into the PI matrix changed the interfacial interactions with alumina.A robust tribofilm consisting of a high fraction of silica was generated when the SCF-reinforced PI was added to the SiO_(2) nanoparticles.It exhibited a high load-carrying capability and was easily sheared.This caused a significant decrease in the friction and wear of the PI composite at 8 MPa·1m/s.Moreover,due to their high melting point,few h-BN nanoparticles were observed in the tribofilm of the SCF-reinforced PI when hexagonal boron nitride was added.

关 键 词：reinforcing filler polyimide composite TRIBOFILM Al_(2)O_(3) 

分 类 号：TB332[一般工业技术—材料科学与工程]