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Cyclic alkyl disulphides as tribological additives
Author(s) -
Verma V. K.,
Singh R.,
Bhattacharya A.,
Tripathi A. K.
Publication year - 2000
Publication title -
lubrication science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.632
H-Index - 36
eISSN - 1557-6833
pISSN - 0954-0075
DOI - 10.1002/ls.3010130104
Subject(s) - lubricant , tribology , alkyl , friction coefficient , materials science , scanning electron microscope , coefficient of friction , organic chemistry , chemical engineering , chemistry , polymer chemistry , composite material , engineering
The use of sulphurised natural oils, fats, hydrocarbons, terpenes and aromatic sulphides, disulphides and poly‐sulphides, as antiwear and extreme‐pressure lubricant additives, has already been established. However, the potential of cyclic disulphides merits attention. The present paper describes the synthesis and evaluation of 0.5% solutions of certain cyclic disulphides as tribological additives, namely 3‐alkylimino‐5‐(N‐methylphenyl)amino‐1,2,4‐dithiazolines, in paraffin oil, on a four‐ball test rig with 12.7 mm diameter steel bearing balls as test specimens. All the additives in general, and 3‐propylimino‐5‐(N‐methylphenyl)amino‐1,2,4‐dithiazoline in particular, exhibited remarkably good antifriction and EP activity, showing a decrease in the coefficient of friction and an appreciable increase in the load‐carrying capacity of the lubricant as indicated by a higher load wear index. The wear surface topography of the used test specimen was studied using scanning electron microscopy.