Friction

, Volume 5, Issue 4, pp 414–428 | Cite as

Aqueous lubrication and surface microstructures of engineering polymer materials (PEEK and PI) when sliding against Si3N4

  • Anying Wang
  • Shuai Yan
  • Bin Lin
  • Xiaofeng Zhang
  • Xiaoxue Zhou
Open Access
Research Article

Abstract

Polyether-ether-ketone (PEEK) and polyimide (PI) are two kinds of engineering polymer materials widely used as roller bearing cages and rings under extreme environment because of their noise reduction and corrosion resistance properties. The Si3N4 ceramic is the most common ball bearing material. Many current engineering applications of ball bearings require aqueous lubrication. Therefore, this study presents the aqueous lubrication of tribopairs formed by PEEK and PI material sliding against Si3N4 ceramic. Experimental results show that two tribopairs exhibited the similar tribological properties under the dry condition. Water as a lubricant for the PI–Si3N4 tribopair pairs effectively reduces both friction coefficients by 35.5% and wear rates by 32%. The water absorption of PI induces better tribological properties by changing the tribopair surface properties. In addition, the dimples appearing on the PI tribopair surface under water generate additional hydrodynamic lubrication and further improve the friction properties of surface. The PEEK–Si3N4 tribopair shows similar friction coefficients under two kinds of environments. The wear rates under water are approximately more than two times of that under dry sliding. However, water inhibits the appearance of the crush phenomenon and enhances the carrying capacity of the tribopair. Energy dispersive spectroscopy and X-ray diffraction spectra demonstrate no chemical corrosion. The 3D profiler and SEM morphologies illustrate that the transfer film would be formed from the surface of PEEK under water but hindered under dry friction. Overall, the PI–Si3N4 tribopair exhibits better properties than PEEK under water and is promising for future applications in the bearing industry.

Keywords

PEEK PI aqueous lubrication dry friction tribological properties ceramic bearing 

Notes

Acknowledgements

This research was supported by the National Natural Science Foundation of China (Nos. 51375333, 50975199 and 51205285). Also the author thanks for all the members who have contributed their time and help in this research.

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© The author(s) 2017

Open Access: The articles published in this journal are distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

Authors and Affiliations

  • Anying Wang
    • 1
  • Shuai Yan
    • 1
  • Bin Lin
    • 1
  • Xiaofeng Zhang
    • 1
  • Xiaoxue Zhou
    • 1
  1. 1.Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of EducationTianjin UniversityTianjinChina

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