Mechano-Chemical Surface Modification with Cu2S: Inducing Superior Lubricity
- 799 Downloads
Advances toward low friction surfaces are in growing demand from many economic sectors for energy efficiency and environmental safety. However, the traditional approach of multi-grade oil formulation is limited by its inability to induce pollution-free generation of uniform oil-retaining films needed to improve surface lubricity. Here, a direct route to the formation of a surface layer of superior lubricity is presented as an alternative to the use of oil additives for friction reduction. The deformation-induced generation of a surface film consisting of low-shear-strength oil-retaining compounds is obtained via supplying chemically beneficial elements during a widely used surface finishing mechanical treatment. An ultra-low friction coefficient of about 0.01 is obtained with base oil lubrication after tailoring the surface chemistry by shot peening using a mixture of Cu2S and Al2O3; this result opens new horizons for surface engineering.
KeywordsPlastic deformation Surface activation Solid-state chemistry Surface films Friction
We acknowledge the support of the Grand Technion Energy Program, the Carl E. Schustak Energy Research and Development Fund, and the New York Metropolitan Research Fund to M.V. This work was performed in part at the Georgia Tech Institute for Electronics and Nanotechnology, a member of the National Nanotechnology Coordinated Infrastructure, which is supported by the National Science Foundation (Grant ECCS-1542174).
- 1.Moore, D.F.: Principles and Applications of Tribology, 1st edn. Pergamon Press, Oxford (1975)Google Scholar
- 2.Bhushan, B.: Introduction to Tribology. Wiley, New York (2002)Google Scholar
- 4.Dowson, D.: History of Tribology. Longman, London (1979)Google Scholar
- 5.Rabinowicz, E.: Friction and Wear of Materials. Wiley, New York (1965)Google Scholar
- 6.Czichos, H.: Tribology: A Systems Approach to the Science and Technology of Friction, Lubrication, and Wear. Elsevier, New York (1978)Google Scholar
- 9.Hutchings, I.M.: Tribology: Friction and Wear of Engineering Materials. Edward Arnold, London (1992)Google Scholar
- 11.Shitara, Y., Suzuki, S., Kaimai, T., Nanao, H., Mori, S.: Improvement of tribological properties with gallic acid derivatives in boundary lubrication. J Jpn Soc Tribol 56(1), 55–61 (2011)Google Scholar
- 12.Kalpakjian, S., Schmid, S.R.: Manufacturing Processes for Engineering Materials, 5th edn. Pearson Education, Upper Saddle River (2008)Google Scholar
- 13.Kostetskii, B.I., Nosovskii, I.G., Karaulov, A.K., Bershadskii, L.I., Kostetskaya, N.B., Lyashko, V.A., Sagach, M.F.: The Surface Strength of Materials in Friction (In Russian). Tekhnika, Kiev (1976)Google Scholar
- 20.Vanysek, P.: Electrochemical series. http://issuu.com/time-to-wake-up/docs/electrochemical_redox_potential. Accessed June 16 2015