Abstract

Biodiesel soot (BDS) was collected with a self-made soot trap used for the combustion of biodiesel. The effect on the tribological behavior of liquid paraffin (LP) was investigated using a four-ball tribometer. A rotating viscometer was used to investigate the effect of BDS on the viscosity of LP. The morphology, composition, and tribological mechanisms of BDS were investigated by means of FETEM, XRD, XPS, SEM/EDS, and 3D laser scanning microscopy. The results showed that BDS aggregates were chain-like and the average diameter of BDS was 35 nm. BDS existed as graphitic layers and amorphous carbon. The oxygen-containing functional groupsinBDS were (COC) and (COH). With increasing BDS content, the dynamic viscosity of LP increased and the maximum nonseizure load increased initially and became stable later. In addition, the average wear scar diameter (AWSD) of LP increased and the average friction coefficient of LP decreased initially and later increased. The tribological mechanisms could be ascribed to the content variation of BDS: BDS acts as a friction modifier for a lower friction coefficient in the case of low BDS content. However, BDS aggregates lead to increase of abrasive wear and influence the lubricating oil film at high content of BDS, which could lower the friction reduction and wear resistance of LP.

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