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Scuffing resistance testing of piston ring materials for marine two-stroke diesel engines and mapping of the operating mechanisms
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
2015 (English)Conference paper, Published paper (Refereed)
Abstract [en]

The incentive is strong for optimising sliding materials to reduce the risk for scuffing. In this study, scuffing tests were performed aiming towards finding new piston ring materials for greener marine diesel engines and also towards understanding scuffing mechanisms better. The tested ring materials where grey iron, Stellite 6, plasma sprayed cermet and high velocity oxy fuel (HVOF) cermet (both cermets with the same compounds: Cr-carbide, Ni, Cr, Mo). The Stellite 6 and HVOF cermet performed somewhat better than the other two materials. Microscopic and spectroscopic studies of failed sample surfaces revealed several characteristic features. It was clear that different mechanisms are active simultaneously, at different parts of the samples. Based on these results, we propose a hypothesis for a scuffing process involving several stages with distinctive mechanisms. Further studies are needed to strengthen this hypothesis and to relate these findings to actual deterioration mechanisms in the engine.

Place, publisher, year, edition, pages
2015.
Keyword [en]
Scuffing, Boundary lubrication, Marine diesel engines, Cast iron, Cermet, Stellite
National Category
Materials Engineering Tribology
Identifiers
URN: urn:nbn:se:uu:diva-286401OAI: oai:DiVA.org:uu-286401DiVA: diva2:921480
Conference
20th International Conference on Wear of Materials
Funder
EU, FP7, Seventh Framework Programme, 265861
Available from: 2016-04-20 Created: 2016-04-20 Last updated: 2016-04-20

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Olander, PetraJacobson, Staffan

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