Results 141 to 150 of about 314 (176)
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Tribology Letters, 2002
Local mechanical properties in depth and near the surface of MoDTC/ZDDP and ZDDP tribofilms, which exhibited obviously different friction coefficients in a pin-on-disc test, were determined by using a nanoindentation technique combined with in-situ atomic force microscopy (AFM) observation. Tapping-mode AFM observation revealed that the MoDTC/ZDDP film
Jiping Ye, Makoto Kano, Yoshiteru Yasuda
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Local mechanical properties in depth and near the surface of MoDTC/ZDDP and ZDDP tribofilms, which exhibited obviously different friction coefficients in a pin-on-disc test, were determined by using a nanoindentation technique combined with in-situ atomic force microscopy (AFM) observation. Tapping-mode AFM observation revealed that the MoDTC/ZDDP film
Jiping Ye, Makoto Kano, Yoshiteru Yasuda
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STM studies of adsorbed ZDDP on graphite
Tribology Letters, 1996We have studied the adsorption of zinc O,O-diisopropylphosphoro-dithioate (ZDDP) adsorption on graphite at room temperature by STM. Two different structures corresponding respectively to monomer and dimer were observed on this surface although only the dimer was found to exist in the crystalline state.
L. Ruan, P. R. Norton, W. K. Wan
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Experimental Analysis on the Lubrication Performance of ZDDP
Advanced Materials Research, 2011In this paper, the antiwear properties of Zinc dithiodialkylphosphate and its synergistic effect with Benzotriazole have been studied by test. The results show that small amount of Benzotriazole can greatly improve the antiwear properties of ZDDP . The compound additive have been used in the research of engine oil formulation, we gained good effect.
Hai Lin Wang, Xiao Ping He
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Tribology Transactions, 2009
Oxidative degradation reduces the effectiveness of lubricants, increases their acidity and viscosity, and contributes to the formation of sludge and deposits. Fluorinated zinc dialkyl dithiophosphate (F-ZDDP) has been shown to be a better antiwear additive in comparison to zinc dialkyl dithiophosphate (ZDDP). This study examines the oxidation stability
Anuradha Somayaji, Pranesh B. Aswath
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Oxidative degradation reduces the effectiveness of lubricants, increases their acidity and viscosity, and contributes to the formation of sludge and deposits. Fluorinated zinc dialkyl dithiophosphate (F-ZDDP) has been shown to be a better antiwear additive in comparison to zinc dialkyl dithiophosphate (ZDDP). This study examines the oxidation stability
Anuradha Somayaji, Pranesh B. Aswath
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Chemistry of ZDDP Tribofilm by ToF-SIMS
Tribology Letters, 2004Time-of-flight secondary ion mass spectrometry (ToF-SIMS) (static and dynamic modes) has been applied to chemical characterization of zinc dithiophosphate additives tribofilm. Main result concerns insights in the spatial distribution of phosphate and sulphide species in the whole tribofilm thickness, at a sub-micrometer scale.
Minfray, Clotilde +5 more
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Effect of ZDDP on friction in fretting contacts
Wear, 2011Abstract The effect of ZDDP on fretting wear was investigated in a ball on flat machine. The results confirm previous work that anti-wear agents may reduce friction and wear in fretting contacts. It was further found that temperature, adsorption time, base oil polarity as well as the presence of other surface active additives in the oil were all ...
Mattias Grahn +2 more
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The Boundaries of Zddp Lubrication
1993The antiwear performance of a commercial secondary zinc dialkyldithiophosphate (ZDDP) in base stock was examined over a wide range of conditions in a 4-ball machine. Particular attention was given to correlating the rate of wear with the appearance of wear scars.
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Interaction Between Selected MoS2 Nanoparticles and ZDDP Tribofilms
Tribology Letters, 2015Nanoparticles based on transition metal dichalcogenides (TMD) are considered to hold great promise as boundary lubricating additive/material for improving friction and wear of engineering functional surfaces. However, TMD nanoparticles cannot provide a comprehensive surface protection against oxidation, corrosion or sludge control.
Agnieszka Tomala +5 more
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Lubrication Science, 1990
AbstractThe anti‐wear action of zinc dithiophosphate (ZDDP), extensively used in engine oils, is here studied by analysis of wear particles generated during a friction test between two ferrous substrates. It is known in this case that the interfacial film is complex, and contains elements from surfaces, environment and degradation products of the ...
M. Hallouis, M. Belin, J. M. Martin
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AbstractThe anti‐wear action of zinc dithiophosphate (ZDDP), extensively used in engine oils, is here studied by analysis of wear particles generated during a friction test between two ferrous substrates. It is known in this case that the interfacial film is complex, and contains elements from surfaces, environment and degradation products of the ...
M. Hallouis, M. Belin, J. M. Martin
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Tribology Transactions, 2003
In a companion paper, Part I, it was shown that the friction enhancement produced in mixed lubrication conditions by ZDDP reaction films is not due to surface roughening as has previously been supposed. Instead, optical measurement of elastohydrodynamic film thickness shows that the presence of a ZDDP reaction layer inhibits the entrainment of liquid ...
Lisa J. Taylor, Hugh A. Spikes
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In a companion paper, Part I, it was shown that the friction enhancement produced in mixed lubrication conditions by ZDDP reaction films is not due to surface roughening as has previously been supposed. Instead, optical measurement of elastohydrodynamic film thickness shows that the presence of a ZDDP reaction layer inhibits the entrainment of liquid ...
Lisa J. Taylor, Hugh A. Spikes
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