Journal
SURFACE & COATINGS TECHNOLOGY
Volume 260, Issue -, Pages 284-289Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2014.06.072
Keywords
DLC coatings; Tribology; Raman spectroscopy; Internal combustion engine
Funding
- Engineering and Physical Sciences Research Council [EP/K005103/1] Funding Source: researchfish
- EPSRC [EP/K005103/1] Funding Source: UKRI
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Hydrogenated diamond-like carbon coatings doped with tungsten were deposited by reactive magnetron sputtering from graphite and composite graphite/tungsten target in an Ar/methane atmosphere. Polished steel samples for laboratory testing and commercial valve tappets were used as substrates. The microstructure of the coating was studied by transmission electron microscopy (TEM), Raman spectroscopy, and electron energy loss spectroscopy, adhesion by scratchtest method and mechanical properties by depth sensing nanoindentation. Coatings were tribologically tested in lubricated contact in laboratory (pin-on-disc) and field (engine) conditions. The worn surfaces were analysed by Raman and time-of-flight secondary ion mass spectroscopies and observed by TEM. The coatings showed excellent wear resistance with negligible wear; the worn surface was covered by a very thin solid tribolayer formed from oil additives. (C) 2014 Elsevier B.V. All rights reserved.
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