Results 141 to 150 of about 322 (174)
Some of the next articles are maybe not open access.
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 ...
Hugh Spikes
exaly +2 more sources
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 ...
Hugh Spikes
exaly +2 more sources
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
openaire +2 more sources
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
openaire +1 more source
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
exaly +2 more sources
Tribochemistry of ZDDP and MoDDP chemisorbed films
Tribology Letters, 1996By means of a UHV analytical AES/XPS pin-on-flat tribotester, we have investigated tribochemical change as well as transfer mechanisms in static reaction films on steel from ZDDP (anti-wear) and MoDDP (friction modifier) lubricant additives. The results show that solid ZDDP reaction films are able to strongly reduce friction to a value of 0.1–0.3 (in ...
J. M. Martin +3 more
openaire +1 more source
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
openaire +1 more source
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
openaire +1 more source
Tribochemistry of ZDDP in molecular orbital calculations
Tribology International, 2004Abstract The molecular orbital parameters of zinc dialkyldithiophosphate (ZDDP) and several metal-atom-cluster models were calculated. The nature and the strength of the interactions between the ZDDP molecules and different metal surfaces are analysed and discussed with the use of frontier orbital theory.
Yuanqiang Tan, Weijiu Huang, Xueye Wang
openaire +1 more source
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.
openaire +1 more source