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Friction and Wear Behavior of CF/PTFE Composites Lubricated by Choline Chloride Ionic Liquids


The use of ionic liquids (ILs) as lubricants has received increasing attention in recent years. The use of ILs, however, is limited by the corrosion problem and their potential toxic property. Here we present the results of our initial study on the tribological properties of carbon fiber (CF)-filled polytetrafluoroethylene (PTFE) composites, which have an excellent chemical resistance property, lubricated by choline chloride ILs. The difference between choline chloride ILs and water and hydraulic oil as lubricants was studied at the same time, as was the effect of the anion on the lubricating property of choline chloride ILs. The worn surface and transfer film of CF/PTFE composites were studied by scanning electron microscopy. Our results indicate that the lubricating property of choline chloride ILs is much better than that of water and hydraulic oil. The friction coefficient and wear rate of CF/PTFE composites lubricated with ILs were approximately 60 and 50 % lower than those under the dry friction condition. Among the three kinds of ILs tested, the best tribological properties of the CF/PTFE composites were found for those sliding in the mixture of 1,2-propanediol and choline chloride. The worn surface and transfer film of CF/PTFE composites were also much smoother than those under the dry friction, water lubrication, and hydraulic oil lubrication conditions.

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  1. 1.

    Weingärtner, H.: Understanding ionic liquids at the molecular level: facts, problems, and controversies. Angew. Chem. Int. Ed. Engl. 47, 654–670 (2008)

  2. 2.

    Baldelli, S.: Surface structure at the ionic liquid–electrified metal interface. Acc. Chem. Res. 41, 421–431 (2008)

  3. 3.

    Bonhote, P., Dias, A.P., Papageorgiou, N., Kalyanasundaram, K., Gratzel, M.: Hydrophobic, highly conductive ambient-temperature molten salts. Inorg. Chem. 35, 1168–1178 (1996)

  4. 4.

    Li, J.H., Shen, Y.F., Zhang, Y.J., Liu, Y.: Room-temperature ionic liquids as media to enhance the electrochemical stability of self-assembled monolayers of alkanethiols on gold electrodes. Chem. Commun. 3, 360–362 (2005)

  5. 5.

    Ye, C.F., Liu, W.M., Chen, Y.X., Yu, L.G.: Room-temperature ionic liquids: a novel versatile lubricant. Chem. Commun. 21, 2244–2245 (2001)

  6. 6.

    Liu, W.M., Ye, C.F., Gong, Q.Y., Wang, H.Z., Wang, P.: Tribological performance of room-temperature ionic liquids as lubricant. Tribol. Lett. 13, 81–85 (2002)

  7. 7.

    Jimenez, A.E., Bermudez, M.D.: Ionic liquids as lubricants of titanium–steel contact. Part 3. Ti6Al4V lubricated with imidazolium ionic liquids with different alkyl chain lengths. Tribol. Lett. 40, 237–246 (2010)

  8. 8.

    Plechkova, N.V., Seddon, K.R.: Applications of ionic liquids in the chemical industry. Chem. Soc. Rev. 37, 123–150 (2008)

  9. 9.

    Zhou, F., Liang, Y.M., Liu, W.M.: Ionic liquid lubricants: designed chemistry for engineering applications. Chem. Soc. Rev. 38, 2590–2599 (2009)

  10. 10.

    Lawes, S.D.A., Hainsworth, S.V., Blake, P., Ryder, K.S., Abbott, A.P.: Lubrication of steel/steel contacts by choline chloride ionic liquids. Tribol. Lett. 37, 103–110 (2010)

  11. 11.

    Uerdingen, M., Treber, C., Balser, M., Schmitt, G., Werner, C.: Corrosion behaviour of ionic liquids. Green Chem. 7, 321–325 (2005)

  12. 12.

    Jimenez, A.E., Bermudez, M.D., Iglesias, P., Carrion, F.J., Martınez, N.G.: 1-N-Alkyl-3-methylimidazolium ionic liquids as neat lubricants and lubricant additives in steel–aluminium contacts. Wear 260, 766–782 (2006)

  13. 13.

    Swatlowski, R.P., Holbrey, J.H., Rogers, R.D.: Ionic liquids are not always green: hydrolysis of 1-butyl-3-methylimidazolium hexafluorophosphate. Green Chem. 5, 361–363 (2003)

  14. 14.

    Bernot, R.J., Brueseke, M.A., Evans-White, M.A., Lamberti, G.A.: Acute and chronic toxicity of imidazolium-based ionic liquids on Daphnia magna. Environ. Toxicol. Chem. 24, 87–92 (2005)

  15. 15.

    Abbott, A.P., Capper, G., Davies, D.L., Rasheed, R.K., Tambyrajah, V.: Novel solvent properties of choline chloride/urea mixtures. Chem. Commun. 1, 70–71 (2003)

  16. 16.

    Abbott, A.P., Boothby, D., Capper, G., Davies, D.L., Rasheed, R.K.: Deep eutectic solvents formed between choline chloride and carboxylic acids: versatile alternatives to ionic liquids. J. Am. Chem. Soc. 126, 9142–9147 (2004)

  17. 17.

    Abbott, A.P., Cullis, P.M., Gibson, M.J., Harris, R.C., Raven, E.: Extraction of glycerol from biodiesel into a eutectic based ionic liquid. Green Chem. 9, 868–872 (2007)

  18. 18.

    Jhong, H.R., Wonga, D.S.H., Wan, C.C., Wang, Y.Y., Wei, T.C.: A novel deep eutectic solvent-based ionic liquid used as electrolyte for dye-sensitized solar cells. Electrochem. Commun. 11, 209–211 (2009)

  19. 19.

    Mafi, I.R., Dehghanian, C.: Comparison of the coating properties and corrosion rates in electroless Ni-P/PTFE composites prepared by different types of surfactants. Appl. Surf. Sci. 257, 8653–8658 (2011)

  20. 20.

    Tanaka, K., Kawakami, S.: Effect of various fillers on the friction and wear of polytetrafluoroethylene-based composites. Wear 79, 221–234 (1982)

  21. 21.

    Voss, H., Friedrich, K.: Sliding and abrasive wear of short glass-fibre reinforced PTFE-composites. J. Mater. Sci. Lett. 5, 1111–1114 (1986)

  22. 22.

    Bahadur, S., Tabor, D.: The wear of filled polytetrafluoroethylene. Wear 98, 1–13 (1984)

  23. 23.

    Briscoe, B.J., Steward, M.D.: The effect of carbon aspect ratio on the friction and wear of PTFE. Wear 42, 99–107 (1977)

  24. 24.

    Feng, X., Diao, X.S., Shi, Y.J., Wang, H.Y., Sun, S.H., Lu, X.H.: A study on the friction and wear behavior of polytetrafluoroethylene filled with potassium titanate whiskers. Wear 261, 1208–1212 (2006)

  25. 25.

    Lancaster, J.K.: Polymer-based bearing materials: the role of fillers and fibre reinforcement. Tribol. Int. 5, 249–255 (1972)

  26. 26.

    Xue, Q.J., Zhang, Z.Z., Liu, W.M., Shen, W.C.: Friction and wear characteristics of fiber- and whisker-reinforced PTFE composites under oil lubricated conditions. J. Appl. Polym. Sci. 69, 1393–1402 (1998)

  27. 27.

    Abbott, A.P., Harris, R.C., Ryder, K.S.: Application of hole theory to define ionic liquids by their transport properties. J. Phys. Chem. B 111, 4910–4913 (2007)

  28. 28.

    Habchi, W., Matta, C., Joly-Pottuz, L., De-Barros, M.I., Martin, J.M., Vergne, P.: Full film, boundary lubrication and tribochemistry in steel circular contacts lubricated with glycerol. Tribol. Lett. 42, 351–358 (2011)

  29. 29.

    Escobar, W.: Understanding polyalkylene glycols (and where to apply them). Tribol. Lubr. Technol. 64, 34–39 (2008)

  30. 30.

    Zhang, C.H., Zhao, Y.C., Bjorling, M., Wang, Y., Luo, J.B., Prakash, B.: EHL properties of polyalkylene glycols and their aqueous solutions. Tribol. Lett. 45, 379–385 (2012)

  31. 31.

    Leron, R.B., Li, M.H.: Molar heat capacities of choline chloride-based deep eutectic solvents and their binary mixtures with water. Thermochim. Acta 530, 52–57 (2012)

  32. 32.

    Li, D.M., Cai, M.R., Feng, D.P., Zhou, F., Liu, W.M.: Excellent lubrication performance and superior corrosion resistance of vinyl functionalized ionic liquid lubricants at elevated temperature. Tribol. Int. 44, 1111–1117 (2011)

  33. 33.

    Bahadur, S.: The development of transfer layers and their role in polymer tribology. Wear 245, 92–99 (2000)

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The authors would like to thank the National Natural Science Foundation of China (Nos. 51005123 and 50903010) and Jiangsu Applied Chemistry and Materials Graduate Center for Innovation and Academic Communication foundation (2010ACMC05) for their financial support.

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Correspondence to Yijun Shi.

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Shi, Y., Mu, L., Feng, X. et al. Friction and Wear Behavior of CF/PTFE Composites Lubricated by Choline Chloride Ionic Liquids. Tribol Lett 49, 413–420 (2013). https://doi.org/10.1007/s11249-012-0083-9

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  • Polytetrafluoroethylene
  • Self-lubricating composites
  • Hydrodynamic lubrication
  • Scanning electron microscopy
  • Ionic liquids
  • Choline chloride