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Effects of frictional conditions on structural transformation of meso-carbon microbeads
The effects of frictional conditions (temperature, loading, sliding velocity) on tribological performances of meso-carbon microbeads (MCMB), which were manufactured from selected petroleum asphalts, were investigated on an optimal SRV tribotester when blended as special additive into a pentaerythritol baseline. Results of the friction tests showed that enhanced heating, increased loading and rapid sliding were beneficial to the dropping of friction coefficient and able to shorten the time period before the onset of the decrease. A working definition of frictional intensity (W) was elaborated to elucidate the ease with which the MCMB was tribologically transformed into its more lubricious allotropes. The more severe the applied frictional conditions, the lower the calculated value of the defined friction intensity. Raman spectroscopic analyses of the worn areas of carbon steel tribomates and calculated values of the microcrystalline planar size (La) of the MCMB tribo-transformed carbonaceous microcrystallines indicated that decrease of 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.
Effects of frictional conditions on structural transformation of meso-carbon microbeads
The effects of frictional conditions (temperature, loading, sliding velocity) on tribological performances of meso-carbon microbeads (MCMB), which were manufactured from selected petroleum asphalts, were investigated on an optimal SRV tribotester when blended as special additive into a pentaerythritol baseline. Results of the friction tests showed that enhanced heating, increased loading and rapid sliding were beneficial to the dropping of friction coefficient and able to shorten the time period before the onset of the decrease. A working definition of frictional intensity (W) was elaborated to elucidate the ease with which the MCMB was tribologically transformed into its more lubricious allotropes. The more severe the applied frictional conditions, the lower the calculated value of the defined friction intensity. Raman spectroscopic analyses of the worn areas of carbon steel tribomates and calculated values of the microcrystalline planar size (La) of the MCMB tribo-transformed carbonaceous microcrystallines indicated that decrease of 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.
Effects of frictional conditions on structural transformation of meso-carbon microbeads
Einfluß der Reibungsbedingungen auf die Strukturumwandlung von Mesocarbon-Mikroperlen
2004
6 Seiten, 6 Bilder, 3 Tabellen, 4 Quellen
Conference paper
English
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