Blackening failure of poly-α-olefin impregnated porous polymide due to the splitting of lubrication oil catalyzed by iron  

作　　者：Pengfei SHI Yang YIN Shaohua ZHANG Diankai ZHANG Yuanyuan JIANG Yang WANG Ningning ZHOU Tao QING Jintao WU Linmao QIAN Jiyang ZHANG Lei CHEN 

机构地区：[1]Tribology Research Institute,State Key Laboratory of Rail Transit Vehicle System,School of Mechanical Engineering,Southwest Jiaotong University,Chengdu 610031,China [2]Beijing Key Laboratory of Long-life Technology of Precise Rotation and Transmission Mechanisms,Beijing Institute of Control Engineering,Beijing 100094,China [3]Technology and Equipment of Rail Transit Operation and Maintenance Key Laboratory of Sichuan Province,School of Mechanical Engineering,Southwest Jiaotong University,Chengdu 610031,China

出　　处：《Friction》2024年第9期1969-1979,共11页摩擦（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.52350411 and 52122507);the National Key R&D Program of China(No.2023YFB3405500);Sichuan Science and Technology Program(Nos.2023NSFSC1988 and 23NSFTD0030);the Independent Project of State Key Laboratory of Traction Power(No.2023TPL-T04).

摘　　要：Lubrication failure accompanying with blackening phenomenon significantly reduces the long-running operational reliability of porous polymide(PPI)lubricated with poly-α-olefin(PAO)oil.Here,the effects of lubrication condition and counter-surface chemistry on the blackening failure of PAO impregnated PPI were studied through the comparison of the tribological tests against GCr15 steel ball and Al_(2)O_(3)ceramic ball with and without PAO oil lubrication.Black products were found to be formed on the PAO impregnated PPI surface slid against steel ball or Al_(2)O_(3)ball added with iron nano-particles,but be absent under the conditions without iron or PAO oil.Further analysis indicated that the iron-catalyzed splitting of PAO oil into small molecule alkanes and following the formation of black organic matter should be mainly responsible for the blackening phenomenon.Molecular dynamic(MD)simulations demonstrated that the iron facilitated the separation of hydrogen atom and the following broken of C–C bonds in PAO molecules,final resulting in the splitting of PAO oil.

关 键 词：porous polyimide poly-α-olefin oil friction-induced blackening phenomenon tribological performance ReaxFF MD simulation 

分 类 号：TH117[机械工程—机械设计及理论]