Experimental evaluation on the tribological properties of coconut oil by the addition of CuO nanoparticles

  • Manu Varghese Thottackkad
  • Rajendrakumar Krishnan Perikinalil
  • Prabhakaran Nair Kumarapillai
Article

Abstract

Considering the environmental problems created by mineral based lubricants, exploring the possibility of the use of vegetable base oils as automobile lubricants has been a growing worldwide trend. In the present study, analysis of coconut oil as a lubricant has been carried out in the perspective of its tribological behaviour using a pin-on-disc tribometer. Copper oxide nanoparticles are added to the oil on weight-percentage basis, the variation of its friction-reduction and antiwear properties are analysed. At an optimum concentration of nanoparticles, the coefficient of friction and the specific wear rate are found to be the lowest. Viscosity of oil is also seen to increase by an increase of concentration of nanoparticles. Flash-point remains constant while the fire-point increases as the nanoparticle concentration is increased. From dispersion analysis it is seen that the nano oil is not suitable enough for long stationary applications. Surface structure of the worn surfaces obtained by Atomic Force Microscopy (AFM) and Scanning Electron Microscopy (SEM) shows that the optimum concentration of nanoparticles in this lubricant causes the roughness of the worn pin surface to reduce to a low value after sliding. Wear scar obtained in the presence of nano oil is smoother compared to that with bare coconut oil. When the level of nanoparticles increases above the optimum level, friction coefficient and wear rate are seen to increase.

Keywords

Coconut oil Nanoparticles Pin-on-disc tribometer Tribological behaviour 

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References

  1. 1.
    Erhan, S. Z., Sharma, B. K., Liu, Z. and Adhvaryu, A., “Lubricant base stock potential of chemically modified vegetable oils,” J. Agric. Food Chem., Vol. 56, No. 19, pp. 8919–8925, 2008.CrossRefGoogle Scholar
  2. 2.
    De Chiffre, L., “Function of cutting fluids in machining,” Lubrication Engineering, Vol. 44, No. 6, pp. 514–518, 1988.Google Scholar
  3. 3.
    Erhan, S. Z. and Asadaukas, S., “Lubricant basestocks from vegetable oils,” Industrial Crops and Products, Vol. 11, No. 2–3, pp. 277–282, 2000.CrossRefGoogle Scholar
  4. 4.
    Ojolo, S. J., Amuda, M. O. H., Ogunmola, O. Y. and Ononiwu, C. U., “Experimental determination of the effect of some straight biological oils on cutting force during cylindrical turning,” Revista Matéria, Vol. 13, No. 4, pp. 650–663, 2008.Google Scholar
  5. 5.
    Fox, N. J. and Stachowiak, G. W., “Vegetable oil-based lubricants-A review of oxidation,” Tribology International, Vol. 40, No. 7, pp. 1035–1046, 2007.CrossRefGoogle Scholar
  6. 6.
    Jagadeesh, K. M. and Satish, V. K., “Studies on boundary lubrication properties of oxidised coconut and soy bean oils,” Lubrication Science, Vol. 21, No. 9, pp. 355–365, 2009.CrossRefGoogle Scholar
  7. 7.
    Dowson, D., “History of Tribology, 2nd ed.,” John Wiley & Sons, pp. 264–266, 1998.Google Scholar
  8. 8.
    Jayadas, N. H., Prabhakaran Nair, K. and Ajithkumar, G., “Tribological evaluation of coconut oil as an environment-friendly lubricant,” Tribology International, Vol. 40, No. 2, pp. 350–354, 2007.CrossRefGoogle Scholar
  9. 9.
    Krzan, B. and Vizintin, J., “Tribological properties of environmentally adopted universal tractor transmission oil based on vegetable oil,” Tribology International, Vol. 36, No. 11, pp. 827–833, 2003.CrossRefGoogle Scholar
  10. 10.
    Maleque, M. A., Masjuki, H. H. and Sapuan, S. M., “Vegetablebased biodegradable lubricating oil additives,” Industrial Lubrication and Tribology, Vol. 55, No. 3, pp. 137–143, 2003.CrossRefGoogle Scholar
  11. 11.
    Jayadas, N. H. and Prabhakaran Nair, K., “Coconut oil as base oil for industrial lubricants-evaluation and modification of thermal, oxidative and low temperature properties,” Tribology International, Vol. 39, No. 9, pp. 873–878, 2006.CrossRefGoogle Scholar
  12. 12.
    Yu, H., Xu, Y., Shi, P., Xu, B., Wang, X. and Liu, Q., “Tribological properties and lubricating mechanisms of Cu nanoparticles in lubricant,” Trans. Nonferrous Metals Society of China, Vol. 18, No. 3, pp. 636–641, 2008.CrossRefGoogle Scholar
  13. 13.
    Zhou, J., Wu, Z., Zhang, Z., Liu, W. and Dang, H., “Study on an antiwear and extreme pressure additive of surface coated LaF3 nanoparticles in liquid paraffin,” Wear, Vol. 249, No. 5–6, pp. 333–337, 2001.CrossRefGoogle Scholar
  14. 14.
    Hisakado, T., Tsukizoe, T. and Yoshikawa, H., “Lubrication mechanism of solid lubricants in oils,” Journal of Lubrication Technology, Vol. 105, No. 2, pp. 245–252, 1983.CrossRefGoogle Scholar
  15. 15.
    Vamsi Krishna, P., Srikant, R. R. and Nageswara Rao, D., “Experimental investigation on the performance of nanoboric acid suspensions in SAE-40 and coconut oil during turning of AISI 1040 steel,” International Journal of Machine Tools and Manufacture, Vol. 50, No. 10, pp. 911–916, 2010.CrossRefGoogle Scholar

Copyright information

© Korean Society for Precision Engineering and Springer-Verlag Berlin Heidelberg  2012

Authors and Affiliations

  • Manu Varghese Thottackkad
    • 1
  • Rajendrakumar Krishnan Perikinalil
    • 1
  • Prabhakaran Nair Kumarapillai
    • 1
  1. 1.Department of Mechanical EngineeringNational Institute of TechnologyCalicutIndia

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