Aqueous lubrication and surface microstructures of engineering polymer materials (PEEK and PI) when sliding against Si3N4
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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.
KeywordsPEEK PI aqueous lubrication dry friction tribological properties ceramic bearing
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.
- Cong P H, Li T S, Xue Q J. Friction and wear of Polyimide and composite materials. Lubrication Engineering (04): 2–7 (1998)Google Scholar
- Cai H, Yan F Y, Chen J M, Xue Q J. Review on the Modification of Polyimide. Journal of Materials Science and Engineering 1: 026 (2003)Google Scholar
- Yang D, Dong Y, Gong J. The Tribological Behaviors of PEEK Filled PTFE Composites. Lubrication Engineering 38(10): 60–63 (2013)Google Scholar
- Wang X. Investigation of tribological performance and simulation of temperature field during sliding contact for polyimide composites. Master Thesis. Nanjing Industrial University, 2005.Google Scholar
- Huang L J, Yang C C, Wang X D, Huang P. Tribological properties of polyimide composites against different metal under dry sliding friction condition. Materials for Mechanical Engineering 10: 016 (2009)Google Scholar
- Wang X D, Wang X, Zhu P, Huang P. Mechanical properties and tribological performance of plastic. Materials for Mechanical Engineering 11: 013 (2005)Google Scholar
- Wu D, Liu Y, Yang S, Yang Z, Tang H. Friction and wear characteristics of WC–10Co–4Cr/Si3N4 tribopair lubricated under silt-laden water. Wear 294: 370–379 (2011)Google Scholar
- Zhang Z, Nie S, Liao W, Li L, Yuan S. Tribological behaviors of carbon fiber reinforced polyetheretherketone sliding against silicon carbide ceramic under seawater lubrication. Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 228(12): 1421–1432 (2014)CrossRefGoogle Scholar
- Lifang C, Chengya H, Xing H. Actuality and Prospect in Research on Friction and Wear Properties of Polymers and Polymer-based Composites. Lubrication Engineering- Huangpu 6(172): 183 (2005)Google Scholar
- Zhang Z Y, Zhang M Q, Zeng H M, Liu Z R. On the tribological behavior and mechanism of Poly (etherether ketone). Acta Materiae Compositae Sinica 4 (1995)Google Scholar
- Jia Z N, Hao C Z, Yan Y H. Effects of different operation conditions on the self lubricating properties of PI/PTFE composites. CHINA PLASTICS INDUSTRY 11: 021 (2014)Google Scholar
- Jia J, Zhou H, Gao S, et al. The tribological behavior of carbon-fiber-reinforced polyimide composites under water lubrication. (in Chinese). Mocaxue Xuebao 22: 273–276 (2002)Google Scholar
- Jia J, Gao S, Chen J, et al. Tribological properties and wear mechanisms of PTFE and carbon fiber reinforced PI composites. (in Chinese). Materials Science and Engineering 21: 183–186 (2003)Google Scholar
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