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Chemical structure of phosphazenes in relation to the tribological properties of a steel‐on‐steel system
Author(s) -
Zhu Jiamei,
Chu Ruizhi,
Meng Xianliang
Publication year - 2009
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.75
Subject(s) - phosphazene , tribology , materials science , x ray photoelectron spectroscopy , scanning electron microscope , oligomer , layer (electronics) , friction coefficient , adsorption , composite material , polymer chemistry , chemical engineering , polymer , chemistry , organic chemistry , engineering
The tribological behaviours of a steel‐on‐steel contact lubricated by three different fluids: (i) tetrakis(3‐trifluoromethylphenoxy)‐ bis (4‐fluorophenoxy)‐cyclotriphosphazene (X‐1P), (ii) a synthetic bridged cyclotriphosphazene, and (iii) linear phosphazene derivative as base fluids were comparatively investigated on an Optimol SRV oscillating friction and wear tester. The results show that X‐1P records the lowest friction coefficient, and linear phosphazene oligomer gives the lowest wear volume loss of the steel among the investigated lubricants. Moreover, the bridged cyclotriphosphazene shows much better anti‐wear ability than cyclotriphosphazene (X‐1P) at both room and elevated temperatures. The worn surfaces were analysed by means of scanning electron microscopy, energy dispersive spectrometry and X‐ray photoelectron spectroscopy. The results demonstrate that the protective layer originated from the tribochemical reaction together with the adsorbed boundary lubricating layer containing organic F‐containing compounds; nitrogen oxide and FeF 2 played an important role in improving the friction and wear behavior of the steel‐on‐steel system. Copyright © 2009 John Wiley & Sons, Ltd.