Results 51 to 60 of about 3,603 (225)

Change in Chemical Structure of ZnDTP-Derived Tribofilm Formed from Low-Viscosity Engine Oil by Addition of PMA-Series Polar Compounds

Tribology Online
The effects of Polymethacrylate (PMA)-series polar compounds on the friction and wear characteristics and on tribofilm formation in fully formulated low-viscosity engine oil have been studied.
Chao Huang, Saiko Aoki
doaj   +1 more source

An in-situ synchrotron XAS methodology for surface analysis under high temperature, pressure and shear [PDF]

, 2017
The complex tribochemical nature of lubricated tribological contacts is inaccessible in real time without altering their initial state. To overcome this issue, a new design of a pin-on-disc tribological apparatus was developed and combined with ...
A. Dorgham, A. Morina, A. Neville, Bhushan B., F. Mosselmans, K. Ignatyev, Klockenkämper R., Socrates G.   +7 more
core   +2 more sources

The Run-in Process for Stable Friction Fade-Out and Tribofilm Analyses by SEM and Nano-Indenter

Tribology Online, 2017
It was shown in previous reports by authors that friction coefficients of the level of 0.0001 were achieved when ZrO2 (Y-PSZ: yttria partially stabilized zirconia) pins were slid against diamond-like carbon (DLC) films in H2-gas environment under heavy ...
Masataka Nosaka, Yushi Morisaki, Tomoaki Fujiwara, Hideaki Tokai, Masahiro Kawaguchi, Takahisa Kato   +5 more
doaj   +1 more source

"Ultralow" sliding wear polytetrafluoro ethylene nanocomposites with functionalized graphene [PDF]

, 2016
The dry friction and sliding wear behavior of sintered polytetrafluoro ethylene containing various amounts of functionalized graphene were studied in this work. Graphene was incorporated in 0, 0.25, 0.75, 1, 2 and 4 vol.%, respectively.
Karger-Kocsis, J., Padenko, E., van Rooyen, L., Wetzel, B.   +3 more
core   +1 more source

Palladium Nanoparticle-Enabled Ultrathick Tribofilm with Unique Composition

ACS Applied Materials & Interfaces, 2018
There is a consensus that savings of 1.0-1.4% of a country's gross domestic product may be achieved through lubrication R&D. Recent studies have shown great potential for using surface-functionalized nanoparticles (NPs) as lubricant additives to enhance lubricating performance.
Chanaka Kumara, Donovan N. Leonard, Harry M. Meyer, Huimin Luo, Beth L. Armstrong, Jun Qu   +5 more
openaire   +3 more sources

Substituent Control of Tribofilm Growth under Mechanochemical Conditions [PDF]

, 2022
Lubricant additives that reduce wear by forming protective tribofilms on sliding surfaces are crucial to maintaining the efficient and reliable operation of many engineering systems. The most important of these additives, zinc dialkyldithiophosphate (ZDDP), has been in use for almost a century; however, several aspects of the physicochemical mechanisms
Jie Zhang, James Ewen, Hugh Spikes
openaire   +1 more source

Friction-condition-dependent sulfide and sulfate evolution on dialkylpentasulfide tribofilm studied by XANES

Friction, 2019
The effects of friction conditions, such as rotational speed, frictional time, and applied load, on the evolution mechanism of sulfide and sulfate on the top and bottom layers of tribofilm were investigated by total electron yield (TEY) and fluorescence ...
Ganlin Zheng, Tongmei Ding, Songhong Pang, Lei Zheng, Tianhui Ren   +4 more
doaj   +1 more source

Ionic Liquids as Performance Ingredients in Space Lubricants

Molecules, 2021
Low vapor pressure and several other outstanding properties make room-temperature ionic liquids attractive candidates as lubricants for machine elements in space applications.
Erik Nyberg, Christoph Schneidhofer, Lucia Pisarova, Nicole Dörr, Ichiro Minami   +4 more
doaj   +1 more source

Contribution to the understanding of tribological properties of graphite intercalation compounds with metal chloride [PDF]

, 2012
Intrinsic tribological properties of lamellar compounds are usually attributed to the presence of van der Waals gaps in their structure through which interlayer interactions are weak.
A Dailly, A Grill, A Vazquez, A Zunger, AA Conte, AR Ubbelohde, B Civalleri, BK Yen, BR Weinberger, D Billaud, D Guérard, D Guérard, D Vanderbilt, D. Billaud, DG Teer, DS Takur, E Benavente, F Batallan, F Labat, F. Boucher, FL Vogel, G Franchini, G Kresse, G Kresse, G Kresse, G Kresse, G Wortmann, H Homma, HJ Monkhorst, J Find, J Paier, J Walter, J Walter, J.-L. Mansot, JA Cowley, JA Williams, JC Charlier, JC Slonczewski, JP Issi, JP Perdew, JW McLure, K Fredenhagen, K Hermansson, K Nagai, K. Delbé, L Pietronero, M Bagouin, M Elzinga, MH Boca, MS Dresselhaus, MS Dresselhaus, NAW Holzwarth, O El-Shazly, P Behrens, P Blaha, P Boolchand, P Thomas, P Thomas, P Ugliengo, PE Blöchl, Ph. Baranek, Ph. Thomas, PR Wallace, R Dovesi, R Dovesi, R Fong, R Vangelisti, R. Vangelisti, S Gauthier, S Grimme, S Grimme, SE Moore, T Bucko, W Rüdorff, W Rüdorff   +74 more
core   +5 more sources

Tribofilms Produced by Supply of Fine Metal Particles in Vacuum

Tribology Online, 2011
This study demonstrates wear-protective tribofilms produced by an artificial supply of fine metal particles onto rubbing steel surfaces in vacuum. The supplied metal particles were Ag, Bi, Cu, Ni, Ti, and Fe, with the diameters of the particles ranging ...
Hirotaka Kato, Akihiro Takimi, Minoru Umemoto   +2 more
doaj   +1 more source