Results 151 to 160 of about 314 (176)
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Friction response of ZDDP thermal film and tribofilm
Tribology - Materials, Surfaces & Interfaces, 2011An original dynamic tribotest was used to study the friction response of two kinds of tribological surface: zinc-dialkyl-dithio-phosphate (ZDDP) thermal film and ZDDP tribofilm. This apparatus allows friction to be determined with no need for measuring tangential force.
Njiwa, P +4 more
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Film thickness and roughness of ZDDP antiwear films
Tribology Letters, 2007The two experimental techniques, spacer layer interferometry imaging (SLIM) and atomic force microscopy (AFM), have been used to measure the thickness and roughness of zinc dialkyl dithiophosphate (ZDDP) reaction films formed in a rolling-sliding minitraction machine (MTM) tribometer.
Ksenija Topolovec-Miklozic +2 more
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Friction-Induced Amorphization with ZDDP—An EXAFS Study
A S L E Transactions, 1986Many experimental works are concerned with the microinvestigation of interface bodies created during the wear process (especially wear particles). Previous works wing STEM have shown that ZDDP wear protection is associated with the structureless nature of wear debris, so that friction-induced amorphization was a key factor to obtain the antiwear ...
J. M. Martin +4 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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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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Synergistic lubricating effects of ZDDP with a heterocyclic compound
Industrial Lubrication and Tribology, 2008PurposeIn response to a plea to eliminate zinc dialkyldithiophosphate (ZDDP) in engine oil, or at least reduce it to 0.05 per cent, unfortunately no new antiwear additives to reduce ZDDP have been found until now. The aim of this paper, therefore, is to resolve these problems by designing a novel benzothiazole compound and using it as a performance ...
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The direct observation of the anti-wear action of ZDDP
1995A direct observation wear machine (DOWM) has been built that allows a lubricated sample to be observed through a rotating sapphire countersurface while being slid at engineering speeds and loads. The DOWM was evaluated by comparing the wear characteristics of 52100 steel in it with those in a conventional 4-ball tester, when lubricated by base stocks ...
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A novel experimental analysis of the rheology of ZDDP tribofilms
2003In this study, the rheology and durability of tribofilm has been investigated. A ZDDP tribofilm (6×8 mm) has been partially removed by Ar+ ion etching (5keV), using an aluminum mask with a comb shape. A striped sample was obtained with a lateral alternation of etched zones and ZDDP tribofilm areas, respectively (about 1 mm width).
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Synthesis of Fluorinated ZDDP Compounds
Tribology Letters, 2008Kajal Parekh +2 more
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