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Tribology of Wire Arc Spray Coatings under the Influence of Regenerative Fuels

Böttcher, Roman; Winkler, Hans-Jörg; Dienwiebel, Martin ORCID iD icon 1; Scherge, Matthias
1 Karlsruher Institut für Technologie (KIT)


In order to further optimize the efficiency of today’s internal combustion engines, specific coatings are used on functional surfaces to reduce internal engine friction and wear. In the current research project, oxymethylene ether (OME) is discussed because it is CO2 neutral and has a strong soot-reducing effect as a fuel or fuel additive. In some operational regimes of the internal combustion engine a dilution of engine oil by fuel must be assumed. In this paper, the frictional contact between piston ring and cylinder raceway is modelled using a pin-on-disk tribometer and the friction and wear behavior between a diamond-like carbon coating (DLC) and a thermal spray coating is characterized. The wear of the spray layer could be continuously detected by radionuclide technology (RNT). With the aid of photoelectron spectroscopic measurements (XPS), the steel thermal spray coating was chemically analyzed before and after the tribometer tests and the oxidative influence of OME was investigated. In addition, confocal microscopy was used to assess the topographies of the specimens. The measurements showed that the addition of OME to the lubricant reduced the viscosity and load-bearing capacity of the lubricating film, which led to an increase in the coefficient of friction. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000084380
Veröffentlicht am 10.07.2018
DOI: 10.3390/lubricants6030060
Zitationen: 1
Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Computational Materials Science (IAM-CMS)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2018
Sprache Englisch
Identifikator ISSN: 2075-4442
KITopen-ID: 1000084380
Erschienen in Lubricants
Verlag MDPI
Band 6
Heft 3
Seiten 60
Vorab online veröffentlicht am 09.07.2018
Schlagwörter engine friction; piston; cylinder ring; thermal spray coating; DLC; OME; wear measurement
Nachgewiesen in Scopus
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