Results 181 to 190 of about 2,042 (207)
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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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molecular spectroscopic studies of ZDDP—PIBS interactions
Lubrication Science, 1998AbstractThe effect of the nature and alkyl chain length of zinc dialkyldithiophosphate (ZDDP) (R = C4 to C8) on its interactions with polyisobutenyl succinimide (PIBS) has been investigated using 31P‐NMR and infrared spectroscopy. 31P‐NMR spectra of ZDDP in the presence of PIBS showed both broad (35–850 Hz) and sharp (50–100 Hz) resonance signals due ...
G. S. Kapur +3 more
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Polymer esters and their synergy with ZDDP – the possibility of reducing ZDDP content in lubricants
Journal of Synthetic Lubrication, 1995AbstractIn recent years, environmental awareness and legislation have enforced ever greater controls on the emissions of motor vehicles. To meet those requirements, the increased use of exhaust port catalysts is almost inevitable. However, there are concerns that lubricant‐derived phosphorus compounds could in the long term be detrimental to those ...
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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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The History and Mechanisms of ZDDP
Tribology Letters, 2004This paper reviews research into the mechanisms of action of the lubricating oil additive, zinc dialkyldithophosphate (ZDDP). The development of the use and research into ZDDP is first charted historically, starting with the additive's first introduction in engine oils in the late 1930s. Then our current state of knowledge of each of the main facets of
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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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The antiwear mechanism of zddp's. Part I
Tribology International, 1982Abstract Zinc dialkyldithiophosphates (zddp's) have been used in internal combustion engine oils for over 30 years as antiwear and antioxidant additives. In this paper, their mode of action is investigated. It was concluded, using various analytical techniques, that zddp's decompose in oil solution predominantly by a hydrolytic mechanism, ultimately ...
H. Spedding, R.C. Watkins
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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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ZDDP-Additive-Catalyst Interactions in Engine Oil
World Tribology Congress III, Volume 1, 2005The phosphorous content in engine oil is found to be the major cause of the poisoning of Catalytic converters in automobiles, hence environmental regulations limiting the phosphorous level in GF4 and GF5 oils have been introduced. Zinc dialkyl dithiophosphate (ZDDP) being the only major source of phosphorous in current engine oils, is also an ...
K. Parekh, R. Mourhatch, P. B. Aswath
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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.
A. Tomala +5 more
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