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Tomanik E.,MAHLE Metal Leve SA | Xavier F.-A.,NAGEL Maschinen u. Werkzeugfabrik GmbH | Zhmud B.,Applied Nano Surfaces Sweden AB
Tribologie und Schmierungstechnik | Year: 2014

The present study focuses on effects of triboconditioning on the tribological properties of cylinder liners. Cylinder liners for a production 13L heavy-duty diesel engine were tribocon-ditioned using a Nagel honing machine with a modified honing head equipped with a set of non-abrasive tools in place of the traditional hones. Also, a special organotungstate-doped process fluid was used instead of the honing oil. In order to evaluate the effect of triboconditioning on the piston assembly/cylinder liner tribology, reciprocating friction rig tests and floating liner engine (FLE) rig tests were used. The tests demonstrated significant improvement in the tribological properties of triboconditi-oned cylinder liners. The improvement was attributed to the formation of WS2/C tribofilms at the component surface and a modified surface roughness profile with reduced core roughness (Rk) and peak height (Rpk). Source


Zhmud B.,Applied Nano Surfaces Sweden AB | Tomanik E.,MAHLE Metal Leve SA | Xavier F.-A.,NAGEL Maschinen u. Werkzeugfabrik GmbH
Lubrication Science | Year: 2014

Triboconditioning is a mechanochemical surface finishing process developed for improving the tribological properties of mechanical components made of steel or cast iron. The process combines elements of extreme pressure mechanical burnishing of the component surface with a tribochemical deposition of a low-friction anti-wear film of tungsten disulphide (WS2). This allows one to produce, in a single finishing operation, a smoother surface with a significantly reduced coefficient of boundary friction and improved wear-resistance and load-carrying capacity. This study presents results of tribological rig tests carried out with valve train components and cylinder bores that underwent the triboconditioning treatment. The results show significant improvement in the tribological properties of triboconditioned components. The improvement is attributed to the formation of WS2 tribofilms at the component surface and a modified surface roughness profile with reduced core roughness (Rk) and peak height (Rpk). Elemental composition of the tribofilms generated by the triboconditioning process has been studied by X-ray photoelectron spectroscopy and energy dispersive X-ray spectroscopy the surface profile of the treated components has been studied using vertical scanning interferometry and the internal structure of the tribofilms has been studied with focused ion beam-transmission electron microscope technique. © 2013 John Wiley & Sons, Ltd. Source


Zhmud B.,Applied Nano Surfaces Sweden AB
Tribology and Lubrication Technology | Year: 2011

Manufacturers are stepping up their R& efforts to build better engines and lighter materials. There is renewed emphasis on understanding the tribological aspects of energy losses in powertrain and using current advancements in lubrication engineering and coatings to minimize such losses. A discussion on efficient lubricants and coatings for automotive applications covers the auto industry's switch to direct fuelling via the introduction of new petrol engines; automotive engine designs; concerns on the use of additives in oil, which may cause exhaust catalyst poisoning; the tribocoatings generated by the ANS triboconditioning process; trend toward low-viscosity oils from SAE 40 and 50 in the 1960s-1980s to the current SAE 20 and 30 viscosity grades; characteristics of modern base oils of API Group II-IV; concerns on the use of friction modifiers; EP antiwear additives, which reduce friction and wear by chemically reacting to the metal surface under boundary contact conditions; and powertrain optimization and curb-weight reduction. Source


Patent
Applied Nano Surfaces Sweden Ab | Date: 2010-07-16

A manufacturing method for providing a low-friction surface comprises providing (

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