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Load and Lubricating Oil Effects on Friction of a PEO Coating at Different Sliding Velocities
Technical Paper
2017-01-0464
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Friction between the piston and cylinder accounts for large amount of the friction losses in an internal combustion (IC) engine. Therefore, any effort to minimize such a friction will also result in higher efficiency, lower fuel consumption and reduced emissions. Plasma electrolytic oxidation (PEO) coating is considered as a hard ceramic coating which can provide a dimpled surface for oil retention to bear the wear and reduce the friction from sliding piston rings. In this work, a high speed pin-on-disc tribometer was used to generate the boundary, mixed and hydrodynamic lubrication regimes. Five different lubricating oils and two different loads were applied to do the tribotests and the COFs of a PEO coating were studied. The results show that the PEO coating indeed had a lower COF in a lower viscosity lubricating oil, and a smaller load was beneficial to form the mixed and hydrodynamic lubricating regimes earlier. The wear scar sizes on counterpart materials were, to some degree, increased with the decrease of oil viscosities at both test loads. It suggests that the benefit of a lower friction (thus, a presumably less wear) induced from a lower viscosity oil couldn’t overweigh a potential concern of wear occurred for a thinner oil. When tested with a very high viscosity of oil, the counterpart material had a significantly less wear, which may indicate that such kind of oil would provide a piston ring with a better protection against the ceramic coating. Thus, a proper selection of lubricating oil for PEO coating would be a decisive factor for balance between reducing friction loss and piston ring wear in an IC engine. The tests were carried out only at a room temperature (~20°C), high temperature tests and floating liner engine dynamometer tests should be done in the future for validation of the benefit of a PEO coating.
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Citation
Wang, G., Nie, X., and Tjong, J., "Load and Lubricating Oil Effects on Friction of a PEO Coating at Different Sliding Velocities," SAE Technical Paper 2017-01-0464, 2017, https://doi.org/10.4271/2017-01-0464.Also In
References
- KS-Aluminium-Technologie, Aluminum Cylinder Blocks-Designs, Materials, Casting Methods and Cylinder Bore Surface Technologies for Lightweight Passenger-Car Engines Verlag Moderne, Industry 2005
- Wang , G. , Nie , X. , and Tjong , J. Investigation into Mixed and Hydrodynamic Frictions of PEO Coatings and Cast Iron SAE Int. J. Fuels Lubr. 9 1 23 31 2016 10.4271/2016-01-0491
- Parker . D.A and Adams . D G Tribology-Key to the Efficient Engine Inst. Mech. Eng. Conf. Pub. London, England 31 39 1982
- Bedajangam S. K. , and Jadhav N. P. Friction losses between piston ring - liner assembly internal combustion engine International Journal of Scientific and Research Publications 3 6 ISSN 2250-3253 2013
- Truhan J. J. , Qu J. , and Blau P.J. The effect of lubricating oil condition on the friction and wear of piston ring and cylinder liner materials in reciprocating bench test 2005 Elsevier 10.1016/j.wear.2005.01.025
- Kim , K. , Shah , P. , Takiguchi , M. , and Aoki , S. Part 3: A Study of Friction and Lubrication Behavior for Gasoline Piston Skirt Profile Concepts SAE Technical Paper 2009-01-0193 2009 10.4271/2009-01-0193
- Ávila , R.N.A. , Azevedo , B.E.A. , and Sodré , J.R. Influence of friction modifier additive on the tribology of lubricating oils 18th International Congress of Mechanical Engineering 2005
- Smith , O. , Priest , M. , Taylor , R.I. , Price , R. , Cantlay , A. , and Coy , R.C. Simulated fuel dilution and friction-modifier effects on piston ring friction JET162©IMechE 2006
- Patel Rachana A. , Niralgikar Kirti H. A Review of Wear in Piston Ring of Internal Combustion Engine IJERT 4 06 June 2015 http://dx.doi.org/10.17577/IJERTV4IS060881
- Bhatt , D.V. , Bulsara M.A. , and Mistry , K.N. Prediction of Oil Film Thickness in Piston Ring-Cylinder Assembly in an IC Engine: A Review Proceedings of the World Congress on Engineering 2009 III SBN: 978-988-18210-1-0
- Dowson , D. Piston assemblies, background and lubrication analysis Taylor , C.M. Engine Tribology Tribology series, 26 213 240 ISBN0-444-89755-0 Elsevier 1993