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Research Article | Open Access

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

Pengfei SHI1, Yang YIN1, Shaohua ZHANG2, Diankai ZHANG1, Yuanyuan JIANG1, Yang WANG1, Ningning ZHOU2, Tao QING2, Jintao WU2, Linmao QIAN1, Jiyang ZHANG2( ), Lei CHEN1,3( )
Tribology Research Institute, State Key Laboratory of Rail Transit Vehicle System, School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China
Beijing Key Laboratory of Long-life Technology of Precise Rotation and Transmission Mechanisms, Beijing Institute of Control Engineering, Beijing 100094, China
Technology and Equipment of Rail Transit Operation and Maintenance Key Laboratory of Sichuan Province, School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China
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Abstract

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 Al2O3 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 Al2O3 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.

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Keywords

porous polyimidepoly-α-olefin oilfriction-induced blackening phenomenontribological performanceReaxFF MD simulation

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Friction
Volume 12 Issue 9,
September 2024
Pages 1969-1979
DOI: 10.1007/s40544-023-0829-4

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SHI P, YIN Y, ZHANG S, et al. Blackening failure of poly-α-olefin impregnated porous polymide due to the splitting of lubrication oil catalyzed by iron. Friction, 2024, 12(9): 1969-1979. https://doi.org/10.1007/s40544-023-0829-4

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Received: 31 January 2023
Revised: 10 April 2023
Accepted: 20 September 2023
Published: 22 April 2024
© The author(s) 2023.

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