Polímeros: Ciência e Tecnologia
Polímeros: Ciência e Tecnologia
Scientific & Technical Article

Effect of surface finishing on friction and wear of Poly-Ether-Ether-Ketone (PEEK) under oil lubrication

Andrade, Thiago Fontoura de; Wiebeck, Hélio; Sinatora, Amilton

Downloads: 0
Views: 343


The tribological properties of poly-ether-ether-ketone (PEEK) containing 30% of carbon fiber were studied in an oil-lubricated environment and different surface finishing of the metallic counterbody. Four different finishing processes, commonly used in the automotive industry, were chosen for this study: turning, grinding, honing and polishing. The test system used was tri-pin on disc with pins made of PEEK and counterbody made of steel; they were fully immersed in ATF Dexron VI oil. Some test parameters were held constant, such as the apparent pressure of 2 MPa, linear velocity of 2 m/s, oil temperature at 85 °C, and the time - 120 minutes. The lubrication regime for the apparent pressure of 1 MPa to 7 MPa range was also studied at different sliding speeds. A direct correlation was found between the wear rate, friction coefficient and the lubrication regime, wherein wear under hydrodynamic lubrication was, on average, approximately 5 times lower, and the friction coefficient 3 times lower than under boundary lubrication.


tribology, PEEK, roughness, wear, friction.


1. America Chemistry Council. (2014). Plastics and polymer composites technology roadmap for automotive markets. Washington: America Chemistry Council.

2. Nunez, E. E., & Polycarpou, A. A. (2015). The effect of surface roughness on transfer of polymer films under unlubricated testing conditions. Wear, 326-327(15), 74-83. http://dx.doi.org/10.1016/j.wear.2014.12.049.

3. Gutiérrez, J. C., Rubio, J. C. C., & Faria, E. (2014). Usinabilidade de materiais compósitos poliméricos para aplicações automotivas. Polímeros. Ciência e Tecnologia, 24(6), 711-719. http://dx.doi.org/10.1590/0104-1428.1582.

4. Greco, A. C., Erck, R., Ajayi, O., & Fenske, G. (2011). Effect of reinforcement morphology on high-speed sliding friction and wear of PEEK polymers. Wear, 271(9-10), 2222-2229. http://dx.doi.org/10.1016/j.wear.2011.01.065.

5. Altstaedt, V., Werner, P., & Sandler, J. (2003). Rheological, mechanical and tribological properties of carbon-nanofibre reinforced poly (ether ether ketone) composites. Polímeros: Ciência e Tecnologia, 13(4), 218-222. http://dx.doi.org/10.1590/S0104-14282003000400005.

6. Zhang, G., & Schlarb, A. K. (2009). Correlation of the tribological behaviors with the mechanical properties of poly-ether-ether-ketone (PEEKs) with different molecular weights and their fiber filled composites. Wear, 266(1-2), 337-344. http://dx.doi.org/10.1016/j.wear.2008.07.004.

7. Elliott, D. M., Fisher, J., & Clark, D. T. (1998). Effect of counterface surface roughness and its evolution on the wear and friction of PEEK and PEEK-bonded carbon fibre composites on stainless steel. Wear, 217(2), 288-296. http://dx.doi.org/10.1016/S0043-1648(98)00148-3.

8. Birkett, A., & Lancaster, J. K.(1985). Counterface effects on the wear of a composite dry-bearing liner. In JSLE International Tribology Conference (pp. 8-10). Tokyo: Elsevier.

9. Stachowiak, G. W., & Batchelor, A. W.(2005). Engineering tribology. Oxford: Butterworth Heinemann.

10. Friedrich, K., Karger-Kocsis, J., & Lu, Z. (1991). Effects of steel counterface roughness and temperature on the friction and wear of PEEK composites under dry sliding conditions. Wear, 148(2), 235-247. http://dx.doi.org/10.1016/0043-1648(91)90287-5.

11. Ramachandra, S., & Ovaert, T. C. (1997). The effect of controlled surface topographical features on the unlubricated transfer and wear PEEK. Wear, 206(1-2), 94-99. http://dx.doi.org/10.1016/S0043-1648(96)07354-1.

12. Eiss, N. S., Wood, K. C., Herold, J. A., & Smyth, K. A. (1979). Model for the transfer of polymer to rough, hard surfaces. Journal of Lubrication Technology, 101(2), 212-218. http://dx.doi.org/10.1115/1.3453326.

13. Victrex Materials Properties Guide. (2014, 20 november). Retrieved in 24 July 2015, from http://www.victrex.com

14. ASTM International. ASTM G-99-04: standard test method for wear testing with pin-on-disk apparatus metals test methods and analytical procedure (Vol. 03.02, Section 3). West Conshohocken: ASTM.

15. Hamrock, B. J., Schmid, S. R., & Jacobson, B. O.(2004). Fundamentals of fluid film lubrication (2nd ed.). New York: Marcel Dekker.

16. Lu, Z. P., & Friedrich, K. (1995). On sliding friction and wear of PEEK and its composites. Wear, 181-183(2), 624-631. http://dx.doi.org/10.1016/0043-1648(95)90178-7.

17. Zhang, G., Rasheva, Z., & Schlarb, A. K. (2010). Friction and wear variations of short carbon fiber (SCF)/PTFE/graphite (10 vol.%) filled PEEK: effect of fiber orientation and nominal contact pressure. Wear, 268(7-8), 893-899. http://dx.doi.org/10.1016/j.wear.2009.12.001.

18. Bowden, F. P., & Tabor, D. (1950). Friction and lubrication of solids. Oxford: Clearendon Press.

19. Greenwood, J. A., & Williamson, J. B. P. (1966). Contact of nominally flat surfaces. Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences, 295(1442), 300-319. http://dx.doi.org/10.1098/rspa.1966.0242.

20. Zhang, Z. Z., Xue, Q. J., & Shen, W. C. (1997). Tribological properties of metal-plastic multilayer composites under oil lubricated conditions. Wear, 210(1-2), 195-203. http://dx.doi.org/10.1016/S0043-1648(97)00040-9.
588371db7f8c9d0a0c8b4ac0 polimeros Articles
Links & Downloads

Polímeros: Ciência e Tecnologia

Share this page
Page Sections