Results 171 to 180 of about 896 (199)

STM studies of adsorbed ZDDP on graphite

Tribology Letters, 1996
We 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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Experimental Analysis on the Lubrication Performance of ZDDP

Advanced Materials Research, 2011
In 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
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The Role of Antioxidants on the Oxidation Stability of Oils with F-ZDDP and ZDDP, and Chemical Structure of Tribofilms Using XANES

Tribology Transactions, 2009
Oxidative degradation reduces the effectiveness of lubricants, increases their acidity and viscosity, and contributes to the formation of sludge and deposits. Fluorinated zinc dialkyl dithiophosphate (F-ZDDP) has been shown to be a better antiwear additive in comparison to zinc dialkyl dithiophosphate (ZDDP). This study examines the oxidation stability
Anuradha Somayaji, Pranesh B. Aswath
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Chemistry of ZDDP Tribofilm by ToF-SIMS

Tribology Letters, 2004
Time-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, Martin, J.M., Barros, M.I. De, Mogne, T. Le, Kersting, R., Hagenhoff, B.   +5 more
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The Boundaries of Zddp Lubrication

1993
The 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.
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Tribochemistry of ZDDP in molecular orbital calculations

Tribology International, 2004
Abstract 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
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The role of sulphur in ZDDP‐induced reaction films formed in the presence of ZDDP: Contribution of electron spectroscopic imaging technique

Lubrication Science, 1990
AbstractThe anti‐wear action of zinc dithiophosphate (ZDDP), extensively used in engine oils, is here studied by analysis of wear particles generated during a friction test between two ferrous substrates. It is known in this case that the interfacial film is complex, and contains elements from surfaces, environment and degradation products of the ...
M. Hallouis, M. Belin, J. M. Martin
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Friction response of ZDDP thermal film and tribofilm

Tribology - Materials, Surfaces & Interfaces, 2011
An 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, Minfray, C., Belin, M., Rigaud, Emmanuel, Martin, M.   +4 more
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Film thickness and roughness of ZDDP antiwear films

Tribology Letters, 2007
The 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, T. Reg Forbus, Hugh A. Spikes   +2 more
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Friction-Induced Amorphization with ZDDP—An EXAFS Study

A S L E Transactions, 1986
Many 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, M. Belin, J. L. Mansot, H. Dexpert, P. Lagarde   +4 more
openaire   +1 more source