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Testing scuffing resistance of materials for marine 2-stroke engines: Difficulties with lab scale testing of a complex phenomenon
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences. (Tribomaterialgruppen, Tribomaterials group)
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2014 (English)In: Proceedings of 16th Nordic Symposium on Tribology: NORDTRIB 2014 / [ed] Sivebæk, Ion Marius, 2014Conference paper (Refereed)
Abstract [en]

Optimising sliding materials of marine two-stroke diesel engine cylinders to reduce the risk for scuffing is imperative because of the high costs associated with replacing the cylinder liner. But how can a complex and poorly understood phenomenon such as scuffing be tested? In this study, the potential to enable material selection based on lab tests is investigated. Experience from ship operation is combined with analysis of lab scale scuffing tests to evaluate the possibilities of gaining applicable knowledge from scuffing testing. Two piston ring materials, a grey cast iron and a plasma sprayed cermet coating, both currently used in engines, were tested. Each of the materials was tested with two surface characters, achieved by run-in in a real engine or by grinding. The ranking of the two materials proved to differ between the two surface characters. In the tests, scuffing could only be detected when all oil had become removed from the contact by being adsorbed by wear debris agglomerates. This, and other critical mechanisms behind scuffing in the tests are thoroughly discussed and compared to possible mechanisms taking place in the engine.

Place, publisher, year, edition, pages
Keyword [en]
Scuffing resistance, cylinder liner, piston ring, materials, marine two-stroke diesel engine
National Category
Metallurgy and Metallic Materials Composite Science and Engineering Tribology
Research subject
Engineering Science with specialization in Tribo Materials
URN: urn:nbn:se:uu:diva-239190ISBN: 978-87-92765-26-0OAI: oai:DiVA.org:uu-239190DiVA: diva2:773573
16th Nordic Symposium on Tribology, Aarhus, June 10-13, 2014
Available from: 2014-12-19 Created: 2014-12-19 Last updated: 2016-04-22

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