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Surface Properties of MoN Coated Engine Piston Rings

  • Hanbey Hazar
Published/Copyright: May 5, 2013
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Abstract

This paper presents an experimental investigation of surface behaviours of compression ring coated with molybdenum nitride (MoN) of a diesel engine. In the experiments carried out, the ring surface of a four stroke diesel engine was coated with MoN — a ceramic material with a thickness of 2.0 ± 0.3 μm — using the arc PVD method. Initially, the test engine MoN coated ring was tested for a while with a load of ½. Then, the same engine without a MoN coating was tested under the same conditions. Analyses of microhardness and SEM were carried out in order to examine surface characteristics of ring. The results show less deformation and fewer scratches due to wear on the MoN coated ring as compared to the uncoated one. We conclude that coating the ring surface of internal combustion engines with MoN contributes to longer life for the ring, and thus the engine, by decreasing the mechanical wear caused by friction.

Kurzfassung

In dieser Arbeit wird eine experimentelle Untersuchung des Oberflächenverhaltens von mit Molybdännitrid (MoN) beschichteten Verdichtungsringen für einen Dieselmotor vorgestellt. Bei den vorgenommenen Experimenten wurde die Ringoberfläche eines Viertakt-Dieselmotors unter Anwendung des PVD-Lichtbogenverfahrens mit MoN überzogen, einem keramischen Material mit einer Dicke von 2,0 ± 0,3 μm. Zu Anfang wurde der mit MoN beschichtete Ring des Testmotors eine Zeitlang unter halber Belastung geprüft. Dann wurde der gleiche Motor ohne eine Beschichtung aus MoN unter den gleichen Bedingungen geprüft. Zur Untersuchung der Oberflächeneigenschaften des Rings wurden Mikrohärte- und REM-Analysen ausgeführt. Die Ergebnisse zeigen eine geringere Verformung und weniger Kratzer, die auf Verschleiß an dem mit MoN beschichteten Ring zurückzuführen sind, im Vergleich zu dem unbeschichteten. Wir schlussfolgern daraus, dass durch das Beschichten der Ringoberfläche von Verbrennungskraftmaschinen mit MoN zu einer längeren Nutzungsdauer des Rings beiträgt, indem der durch Reibung verursachte mechanische Verschleiß verringert wird.


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Hanbey Hazar Born 07.06.1973 Elazig Turkey; Study at University of Firat, Elazig, Turkey; B.Sc. Technical Education Faculty, Firat University 1997, M.Sc. 1999, PhD 2004, The experimental investigation of wear behaviour of a diesel engine with cylinder having ceramic coated surface, Graduate School of Science at University Elazig. Research areas: Surface coating and abrasion wear of materials, composite materials and their, Automotive performance and emissions.


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Received: 2009-1-16
Accepted: 2009-12-17
Published Online: 2013-05-05
Published in Print: 2010-05-01

© 2010, Carl Hanser Verlag, München

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