Results 181 to 190 of about 2,081 (223)
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Effects of Temperature and Pressure on ZDDP
Tribology Letters, 2007A recent theoretical study proposed that the anti-wear property of zinc dialkyl dithio phosphate (ZDDP) is due to the formation of chemically connected networks as a result of pressure-induced cross-linkage of phosphate groups of thermally decomposed ZDDP.
John S. Tse, Yang Song, Zhenxian Liu
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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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Journal of Nanoscience and Nanotechnology, 2007
Tribofilms with thickness ranging from 100–200 nm were developed in-situ during wear tests using a zinc dialkyl dithiophosphates (ZDDP) and fluorinated ZDDP (F-ZDDP). The influence of the antioxidant alkylated diphenyl amine on the formation and properties of these tribofilm is examined.
Anuradha, Somayaji +2 more
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Tribofilms with thickness ranging from 100–200 nm were developed in-situ during wear tests using a zinc dialkyl dithiophosphates (ZDDP) and fluorinated ZDDP (F-ZDDP). The influence of the antioxidant alkylated diphenyl amine on the formation and properties of these tribofilm is examined.
Anuradha, Somayaji +2 more
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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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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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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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