The synthesis and antiwear action of tungsten dithiolate

1996 ◽  
Vol 8 (4) ◽  
pp. 389-395 ◽  
Author(s):  
Xiong Rengen ◽  
Dong Junxiu
Keyword(s):  
Antiwear Action

Mechanical Properties of ZDTP Tribofilms Measured by Nanoindentation: Strain Rate and Temperature Effects

2008 ◽  
Author(s):  
S. Bec ◽  
K. Demmou ◽  
J.-L. Loubet
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Strain Rate ◽  
Film Formation ◽  
Point Of View ◽  
Effect Of Temperature ◽  
Zinc Dialkyldithiophosphate ◽  
Wear Rates ◽  
Versus Strain ◽  
Antiwear Action

This study aims to contribute to better understand the antiwear action of zinc dialkyldithiophosphate (ZDTP) additives used in car engine lubrication. The antiwear action of ZDTP is associated to the formation of a protective tribofilm onto the rubbing surface. On a mechanical point of view, the efficiency of ZDTP tribofilms results from equilibrium between film formation and wear rates, associated with appropriate rheological properties. In this work, the mechanical properties of a ZDTP tribofilm have been measured by nanoindentation in different test conditions in order to investigate the effect of temperature and strain rate. A Nanoindenter XP® entirely set into a climatic chamber was used to perform the nanoindentation tests. For all tests, an increase of the elastic modulus was observed from a threshold contact pressure value. This effect is similar to the anvil effect observed on polymers: in confined geometry, the elastic modulus increases versus hydrostatic pressure. For the tribofilm, in the studied range, this effect is enhanced at high temperature and low strain rate. Furthermore, when the temperature increases, a change in the rheological behavior of the tribofilm is observed. Up to about 50°C, the tribofilm exhibits viscoplastic behavior — the hardness increases versus strain rate — and above 50°C, the hardness decreases versus strain rate (“shear thinning-like” behavior).

Antiwear Action of Mineral Lubricants Modified by Conventional and Uncoventional Additives

2007 ◽  
Vol 27 (2) ◽  
pp. 177-180
Author(s):  
Anna Matuszewska ◽  
Marian Gradkowski
Keyword(s):  
Antiwear Action

The Antiwear Action of Zinc Di-n-Butyl Phosphate

1979 ◽  
Vol 22 (2) ◽  
pp. 190-192 ◽  
Author(s):  
A. Dorinson
Keyword(s):  
Antiwear Action

scholarly journals Tribochemical Interactions between Carbon Nanotubes and ZDDP Antiwear Additive during Tribofilm Formation on Uncoated and DLC-Coated Steel

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2409
Author(s):  
Wojciech Dzięgielewski ◽  
Joanna Kowalczyk ◽  
Andrzej Kulczycki ◽  
Monika Madej ◽  
Dariusz Ozimina
Keyword(s):  
Carbon Nanotubes ◽  
Solid Surface ◽  
Antiwear Additive ◽  
Molecular Structures ◽  
Coated Steel ◽  
Structure And Properties ◽  
Tribological Tests ◽  
Zinc Dithiophosphate ◽  
Steel Balls ◽  
Antiwear Action

The data from the authors’ earlier investigations show that molecules of zinc dithiophosphate (ZDDP) added to a lubricant can absorb energy emitted by a solid surface, which is where triboreactions occur. If the lubricant contains structures able to conduct energy, the ZDDP reactions can occur even at a relatively large distance from the solid surface, which should increase the effectiveness of ZDDP as an antiwear additive. The purpose of this paper was to verify the thesis that the tribocatalytic effect depends on the ability of the solid surface to emit electrons/energy and the ability of ordered molecular structures, such as carbon nanotubes (CNTs), to conduct energy and, most likely, to enhance the energy transfer. The tribological tests were performed using a TRB3 tribotester for 100Cr6 steel balls and uncoated or a-C:H coated HS6-5-2C steel discs. Polyalphaolefin 8 (PAO8) and PAO8 mixed with ZDDP and CNTs were used as lubricants. The results of the tribological tests suggested that: (a) the effect of the interactions between ZDDP and CNTs was clearly visible; (b) the structure and properties of the solid surface layer had a significant influence on the antiwear action of the ZDDP additive.

New data on the mechanism of antiwear action of zinc dithiophosphates in lubricating oils

1994 ◽  
Vol 7 (1) ◽  
pp. 93-100 ◽  
Author(s):  
A. B. Vipper ◽  
A. K. Karaulov ◽  
O. A. Mischuk
Keyword(s):  
Lubricating Oils ◽  
Zinc Dithiophosphates ◽  
Antiwear Action

Tribochemistry of the Antiwear Action of a Dimer Acid/Glycol Monoester on Alumina©

1994 ◽  
Vol 37 (1) ◽  
pp. 67-74 ◽  
Author(s):  
M. J. Furey ◽  
H. Ghasemi ◽  
B. S. Tripathy ◽  
C. Kajdas ◽  
R. Kempinski ◽  
...  
Keyword(s):  
Dimer Acid ◽  
Antiwear Action

ChemInform Abstract: SYNTHESIS AND STUDY OF THE ANTIWEAR ACTION OF HIGHER ESTERS OF 5,5′-THIODIVALERIC ACID

1980 ◽  
Vol 11 (48) ◽  
Author(s):  
P. S. BELOV ◽  
V. A. TROFIMOV ◽  
A. N. ERMOLAEVA ◽  
A. B. VIPPER ◽  
V. L. LASHKHI ◽  
...  
Keyword(s):  
Antiwear Action

Antiwear and Extreme-Pressure Action of Copper(II) Complex With Alkyl Phosphonic Acid Mono Alkyl Ester

1996 ◽  
Vol 118 (3) ◽  
pp. 676-680 ◽  
Author(s):  
Ren-Gen Xiong ◽  
Hong Wang ◽  
Jing-Lin Zuo ◽  
Cai-Ming Liu ◽  
Xiao-Zeng You ◽  
...  
Keyword(s):  
Mass Spectroscopy ◽  
Phosphonic Acid ◽  
Fast Atom Bombardment ◽  
Extreme Pressure ◽  
Tricresyl Phosphate ◽  
Action Mechanism ◽  
Monoalkyl Ester ◽  
Antiwear Properties ◽  
Alkylphosphonic Acid ◽  
Antiwear Action

The copper(II) complex with alkylphosphonic acid monoalkyl ester (CuAMP) was synthesized, and its structure shown to be laminar on the basis of fast atom bombardment mass spectroscopy (FABMS). The extreme-pressure, antiwear and antiseizure performance of CuAMP was assessed using a four-ball machine. The results showed that CuAMP exhibits better extreme-pressure and antiwear properties than tricresyl phosphate. Based on the results of surface analysis, the antiwear action mechanism of CuAMP is discussed.

Antiwear action of tribopolymer-forming additives in the contact interaction of nonferrous metals

1976 ◽  
Vol 12 (3) ◽  
pp. 222-224
Author(s):  
N. A. Balan ◽  
L. A. Chupina ◽  
R. N. Zaslavskii ◽  
Yu. S. Zaslavskii ◽  
A. N. Panarina
Keyword(s):  
Contact Interaction ◽  
Nonferrous Metals ◽  
Antiwear Action
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