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Friction 2023, 11(8): 1493-1504 https://doi.org/10.1007/s40544-022-0693-7
Research Article | Open Access | Issue | Published: 16 January 2023

Tribological properties of oil-impregnated polyimide in double-contact friction under micro-oil lubrication conditions

Show Author's Information Jinbang LI1,2( ),  Jinyang LIU1,  Kai LI1,  Ningning ZHOU3,  Yang LIU1,4,  Xudong HU1,  Shunli YIN2,  Guorong WANG5
School of Mechanical Engineering & Mechanics, Ningbo University, Ningbo 315211, China
Healthy & Intelligent Kitchen Engineering Research Center of Zhejiang Province, Ningbo 315211, China
Beijing Key Laboratory of Long-life Technology of Precise Rotation and Transmission Mechanisms, Beijing Institute of Control Engineering, Beijing 100029, China
Key Laboratory of Impact and Safety Engineering, Ministry of Education, Ningbo University, Ningbo 315211, China
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China
Keywords:
oil-impregnated material, porous polyimide (PPI), double-contact friction, micro-oil lubrication
Cite this article:
LI J, LIU J, LI K, et al. Tribological properties of oil-impregnated polyimide in double-contact friction under micro-oil lubrication conditions. Friction, 2023, 11(8): 1493-1504. https://doi.org/10.1007/s40544-022-0693-7
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Abstract Full text About this article

Oil-impregnated porous polyimide (iPPI) materials are usually used as retainer for bearings. In these bearings, balls and rings, balls and retainers are two different kinds of contact. In this paper, the friction and wear properties of iPPI were investigated using steel (disc)–steel (ball)–iPPI (pin) double-contact friction test rig for simulating the actual contact in bearings. The results show that compared with that of iPPI–steel single contact, the friction coefficient of iPPI–steel in double contacts is lower and decreases with the amount of additional oil. The surface of iPPI in single contact suffers more wear compared with that in double contacts. Different from single contact, the worn surfaces of iPPI in double contacts are blackened. The Raman spectra of worn surfaces of balls and discs indicate that α-Fe2O3 and Fe3O4 were formed during rubbing of the double contacts. Many nanoscale iron oxide particles are found on the worn surfaces of iPPI in double contacts; on the contrary, few particles could be found on the surface in single contact. In double-contact friction, the nanoscale wear debris penetrates inside the iPPI material through the process of extruding and recycling of oil, which is the mechanism of the blackening of the iPPI worn surfaces. The studies show that the double-contact friction method is a new and effective method to study the friction in bearings, especially for those with polymer retainer.


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About this article

Tribological properties of oil-impregnated polyimide in double-contact friction under micro-oil lubrication conditions

Show Author's information Jinbang LI1,2( ), Jinyang LIU1, Kai LI1, Ningning ZHOU3, Yang LIU1,4, Xudong HU1, Shunli YIN2, Guorong WANG5
School of Mechanical Engineering & Mechanics, Ningbo University, Ningbo 315211, China
Healthy & Intelligent Kitchen Engineering Research Center of Zhejiang Province, Ningbo 315211, China
Beijing Key Laboratory of Long-life Technology of Precise Rotation and Transmission Mechanisms, Beijing Institute of Control Engineering, Beijing 100029, China
Key Laboratory of Impact and Safety Engineering, Ministry of Education, Ningbo University, Ningbo 315211, China
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China

Abstract

Oil-impregnated porous polyimide (iPPI) materials are usually used as retainer for bearings. In these bearings, balls and rings, balls and retainers are two different kinds of contact. In this paper, the friction and wear properties of iPPI were investigated using steel (disc)–steel (ball)–iPPI (pin) double-contact friction test rig for simulating the actual contact in bearings. The results show that compared with that of iPPI–steel single contact, the friction coefficient of iPPI–steel in double contacts is lower and decreases with the amount of additional oil. The surface of iPPI in single contact suffers more wear compared with that in double contacts. Different from single contact, the worn surfaces of iPPI in double contacts are blackened. The Raman spectra of worn surfaces of balls and discs indicate that α-Fe2O3 and Fe3O4 were formed during rubbing of the double contacts. Many nanoscale iron oxide particles are found on the worn surfaces of iPPI in double contacts; on the contrary, few particles could be found on the surface in single contact. In double-contact friction, the nanoscale wear debris penetrates inside the iPPI material through the process of extruding and recycling of oil, which is the mechanism of the blackening of the iPPI worn surfaces. The studies show that the double-contact friction method is a new and effective method to study the friction in bearings, especially for those with polymer retainer.

Keywords: oil-impregnated material, porous polyimide (PPI), double-contact friction, micro-oil lubrication

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Publication history

Received: 17 April 2022
Revised: 02 July 2022
Accepted: 04 September 2022
Published: 16 January 2023
Issue date: August 2023

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© The author(s) 2022.

Acknowledgements

This work was supported by the Natural Science Foundation of Zhejiang Province (No. LY21E050003) and Science and Technology Innovation 2025 Major Project of Ningbo (No. 2019B10078).

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