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Effects of frictional conditions on structural transformation of mesocarbon microbeads
Author(s) -
Cui X. H.,
Li S. H.,
Jin Y. S.,
Fu H. L.,
Song H. H.
Publication year - 2006
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.26
Subject(s) - materials science , microcrystalline , tribology , pentaerythritol , composite material , raman spectroscopy , planar , yield (engineering) , friction coefficient , intensity (physics) , carbon fibers , composite number , chemistry , crystallography , fire retardant , optics , physics , computer graphics (images) , computer science
The effects of frictional conditions (temperature, loading, sliding velocity) on the tribological performance of mesocarbon microbeads (MCMB), which were manufactured from selected petroleum asphalts, were investigated on an Optimal SRV tribotester when blended as a special additive in a pentaerythritol baseline. The results of the friction tests showed that enhanced heating, increased loading and rapid sliding were beneficial in decreasing friction coefficient and able to shorten the time before the onset of this decrease. A working definition of frictional intensity was elaborated to elucidate the ease with which the MCMB were tribologically transformed into their more lubricious allotropes. The more severe the applied frictional conditions, the lower the calculated value of the defined frictional intensity. Raman spectroscopic analyses of the worn areas of carbon steel tribosurfaces and calculated values of the microcrystalline planar size of the MCMB tribo‐transformed carbonaceous microcrystallines indicated that the decrease in friction coefficient was related to the structural transformation of MCMB towards highly ordered, carbonaceous allotropes. More rigorous frictional conditions would yield highly ordered structures of carbonaceous microcrystallines of bigger planar sizes. Copyright © 2006 John Wiley & Sons, Ltd.