Results 131 to 140 of about 207 (164)
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Contribution of Phosphorus to the Antiwear Performance of Zinc Dialkyldithiophosphates
A S L E Transactions, 1985Four-ball wear studies show that the antiwear (low load) performance of zinc dialkyldithiophosphates (ZDPs) can be duplicated by combining a dialkyl acid phosphate and a soluble zinc compound. Antiwear performance of acid phosphates was independent of chain length for C8 to C18 but affected by chain branching and ring substitution.
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The antiwear property of zinc dialkyldithiophosphates in used engine oils
Wear, 1983Abstract The change in the lubrication properties of vehicle engine oils with driving distance was studied by using a cross-pin type of lubricant tester and a Fourier transform IR spectrometer. The effect of the thermal decomposition of zinc dialkyldithiophosphates (ZnDTPs) on their antiwear property was also examined.
Kenji Fujita +2 more
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Nanomechanical properties of films derived from zinc dialkyldithiophosphate
Tribology Letters, 1998We have applied scanning force microscopes to the problem of determining the nanomechanical properties and topography of films derived from the antioxidant/antiwear oil additive zincdialkyldithiophosphate (ZDDP). The enhanced capabilities of the interfacial force microscope (IFM) are exploited to obtain quantitative force-displacement data and pre- and
O.L. Warren +4 more
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The Effects of Antioxidant Reactions on the Wear Behavior of a Zinc Dialkyldithiophosphate
A S L E Transactions, 1979A systematic study of the wear behavior of a synthetic hydrocarbon bare oil as a function of time and concentration of added zinc di-n-octyldithiophosphate, ZDTP, has been carried out utilizing the 4-ball apparatus. A comparative study was made using ZDTP which had been reacted with a known concentration of peroxy radical species. Wear rates manifested,
P. A. Willermet +2 more
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Study of zinc dialkyldithiophosphate using electrochemical techniques
2002Electrochemical techniques have been applied to study the redox behaviour of the antiwear additive zinc diisooctyldithiophosphate (ZDDP) in an ester base fluid and to investigate the influence of applied electrode potential on its friction and wear properties.
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Improving the aging resistance of asphalt by addition of Zinc dialkyldithiophosphate
Fuel, 2006The aging properties of asphalts are evaluated using high pressure-gel permeation chromatography (HP-GPC) and Fourier Transform Infrared (FTIR) spectroscopy. The effect of a small amount (1 wt%) of zinc dialkyldithiophosphate (ZDDP) on the chemical and physical properties, and molecular weight distribution of asphalts is studied.
Chunfa Ouyang +3 more
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The Role of Hydroperoxides in Engine Wear and The Effect of Zinc Dialkyldithiophosphates
A S L E Transactions, 1986Value train wear was examined in a motored 2.3 l engine similar to that wed in the Sequence V-D test. A procedure was developed in which model hydroperoxides were added to the crankcase oil to simulate used oil. Cam lobe and follower wear occurred, apparently as a result of direct attack by the hydroperoxides on rubbing surfaces rather than through oil
J. J. Habeeb, W. H. Stover
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Wear, 1985
Abstract Japanese valve train wear engine tests were carried out using oils containing a common zinc dialkyldithiophosphate (ZnDTP). The ZnDTP decomposition products formed in the oils during the engine tests were analysed. It was found that the ZnDTP decomposition results in the formation of zinccontaining compounds and phosphorus-containing ...
K. Hosonuma, K. Yoshida, A. Matsunaga
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Abstract Japanese valve train wear engine tests were carried out using oils containing a common zinc dialkyldithiophosphate (ZnDTP). The ZnDTP decomposition products formed in the oils during the engine tests were analysed. It was found that the ZnDTP decomposition results in the formation of zinccontaining compounds and phosphorus-containing ...
K. Hosonuma, K. Yoshida, A. Matsunaga
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The correlation of antiwear properties with the chemical reactivity of zinc dialkyldithiophosphates
Wear, 1982Abstract The chemical reactivity of zinc dialkyldithiophosphates (ZnDTPs) with iron was investigated using differential thermal analysis (DTA). The antiwear property was examined with a cross-pin-type lubricant tester. The types of alkyl groups in the ZnDTPs were identified by DTA.
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Variation in zinc dialkyldithiophosphate yield strength measured by nanopillar compression
Tribology International, 2018Abstract In situ transmission electron microscopy based nanopillar compression is utilized to investigate the mechanical properties of zinc dialkyldithiophosphate (ZDDP) tribological films. Small scale testing provides localized insights into the properties of ZDDP films that spatially vary in composition at the nanoscale.
Lin Feng +4 more
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