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Application of DLC Coating in Cylinder Liners for Friction Reduction
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 16, 2012 by SAE International in United States
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In the past decades, continuous improvement to the finishing process (honing) of cylinder liner has led to a considerable reduction in engine friction, wear and oil consumption via optimization of the running surface topography. However, in order to meet the constantly restrictive environmental regulations, the automotive industry has invested in reducing fuel consumption and exhaust emission to expressive low levels mainly by minimizing friction losses. The properties of Diamond-like carbon (DLC) coatings are known to offer superior wear resistance and low friction making it suitable for many different tribological applications. This paper discusses the application of DLC in Heavy-Duty Diesel (HDD) cylinder liners as an alternative to reduce friction on the power cell as well as its tribological performance when submitted against coated top piston rings with CrN. Reciprocating rig and fired engine tests are presented. Evaluation criteria for rig test included friction under lubricated condition at constant oil temperature of 120°C. Test results show that DLC coating improved tribological system decreasing friction losses by 19%. Finally, results from a short durability test on HDD engine platform have confirmed a significant reduction of 2.5% on specific fuel consumption as well as superior wear resistance of DLC-coated cylinder liners when compared with base-uncoated ones.
CitationRejowski, E., Mordente Sr, P., Pillis, M., and Casserly, T., "Application of DLC Coating in Cylinder Liners for Friction Reduction," SAE Technical Paper 2012-01-1329, 2012, https://doi.org/10.4271/2012-01-1329.
- Öner, C. Hazar, H. Nursoy, M. Bobzin, K. “Surface properties of CrN coated engine cylinders” Materials and Design 2009 30 914 920
- Richardson, D. E. “Review of power cylinder friction for diesel engines” Journal of Engineering for Gas Turbines and Power - ASME October 2000 122
- Tomanik, E. Ferrarese, A. “Low friction ring pack for gasoline engines” Proceedings of the ASME ICEF2006-1566 November 2006 5th 8th Sacramento, USA
- Jocsak, J. et al. “The effects of cylinder liner finish on piston ring-pack friction” ASME paper ICEF2004-952 2004
- Tomanik, E. “Friction and Wear Bench Tests of Different Engine Liner Surface Finishes” Tribology International 2008 41 11 1032 8
- Morgenstern, R. Kiessling, W. “Reichstein S., Reduced friction losses and wear by DLC coating of piston pins” Proceedings of the ASME ICES2008-1650 April 2008 27th 30th Chicago, Illinois, USA
- Grill, A. “Diamond-like carbon: state of the art” Diamond and Related Materials 1999 8 428 434 New York, USA
- Schamel, A. Grischke, M. Bethke, R. “Amorphous Carbon Coatings for Low Friction and Wear in Bucket Tappet Valvetrains,” SAE Technical Paper 970004 1997 10.4271/970004
- Erdemir, A. Ozturk, O. Alzoubi, M. Woodford, J. et al. “Near-Frictionless Carbon Coatings for Use in Fuel Injectors and Pump Systems Operating with Low-Sulfur Diesel Fuels,” SAE Technical Paper 2000-01-0518 2000 10.4271/2000-01-0518
- Bewilogua, H. Bräuer, G. Dietz, A. Gäbler, J. Goch, G. Karpuschewski, B. Szyszka, B. “Surface technology for automotive engineering” CIRP Annals 2009 Manufacturing Technology 58 2009 608 627
- Grischke, M. Hieke, A. Morgenweck, F. Dimigen, H. “Variation of the Wettability of DLC-coatings by Network Modification Using Silicon and Oxygen” Diamond and Related Materials 1998 7 454 458
- Maciel S., H. et al. “Studies of Hollow Cathode Discharges Using Mass Spectrometry and Electrostatic Probe Techniques” 12th International Congress on Plasma Physics 25 29 October 2004 Nice (France)
- Lusk, D. Gore, M. Boardman, W. Casserly, T. Boinapally, K. Oppus, M. Upadhyaya, D. Tudhope, A. Gupta, M. Cao, Y. Lapp, S. “Thick DLC films deposited by PECVD on the internal surface of cylindrical substrates” Diamond and Related Materials 8 1999 428 434
- Uehara, S. “Overview of the New Surface Finishings for SI Bores,” SAE Technical Paper 2007-01-2823 2007 10.4271/2007-01-2823