Modification and Evaluation of a Lubricant with Carbon Nanotubes for Application in Rolling-Sliding Pairs
Keywords:
Carbon nanotubes, Polyalphaolefin, Friction modifiers, Rheology, TribologyAbstract
Everything man makes undergoes progressive wear and if it is not controlled involves high energy consumption, replacement of parts and therefore production stoppages that raise costs and brings financial losses. Lubricants are part of this scenario to the extent that they help control wear and friction coefficient, improve the load capacity and reduce heating. Various carbon-based materials have been widely studied as additives in lubricants, among which carbon nanotubes stand out. In this paper were synthesized, purified and functionalized carbon nanotubes by chemical vapor deposition, which were then added to a polyalphaolefin; the rheological properties of the various blends were evaluated and the tribological properties were studied under rolling-sliding conditions in a twin-disc testing machine. The tests were performed using 0% of creepage and a contact pressure of 0.8 GPa. As a result, the major structural features of the nanotubes were identified.Iit was found that all blends showed dilatant rheological behavior, the values of friction coefficient were lower for the lubricants containing nanotubes and the retentivity varied according to the type of nanotube, being lower for single-walled and higher for multi-walled
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