Abstract
Biodiesel soot interacts with engine oil and ultimately leads to wear of engine parts. Following an overview of tribological active control and introduction of the effect of rGO@Fe3O4 on the tribological behavior of polyalphaolefin, this chapter details the effects of rGO@Fe3O4 on the tribological behavior of biodiesel soot (BDS) contaminated lubricating oil using a UMT-2 multifunction friction tester. The worn surfaces of the lower disc were analyzed by three-dimensional laser scanning microscopy, field-emission scanning electron microscopy (FESEM), and Raman spectroscopy. The additive rGO@Fe3O4 in polyalphaolefin-6 (PAO) base oil containing BDS was observed to reduce the wear of the GCr15 steel specimens. The tribological mechanism is attributed to the formation of a protecting layer in the presence of rGO@Fe3O4 and the ability of exfoliated Fe3O4 particles to repair the friction surfaces, resulting in an enhanced antiwear property of PAO6 that contains BDS.
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