Size effects of SiO₂ nanoparticles as oil additives on tribology of lubricant

Abstract

Purpose -The purpose of this paper is to investigate the tribological properties of liquid paraffin with SiO 2 nanoparticles additive made by a sol-gel method. Design/methodology/approach -The tribological properties of the SiO 2 nanoparticles as an additive in liquid paraffin are measured using a ball-onring wear tester to determine the optimal additive concentration. The mechanism that wear and friction are reduced is studied using scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), and atomic force microscope (AFM). Findings -Experimental results indicate that the sizes of the synthesized SiO 2 nanoparticles are distributed uniformly and that the optimal concentrations of SiO 2 nanoparticles in liquid paraffin is associated with better tribological properties than pure paraffin oil, and an anti-wear (AW) ability that depends on the particle size. Originality/value -It is shown in the paper that by reducing friction and AW, the lubricant prepared by the methods described can prolong operating hours of machinery.

Investigation on the Tribological Behaviour of Modified Jatropha Oil with Hexagonal Boron Nitride Particles as a Metalworking Fluid for Machining Process

“…Apart from that, the increment of hBN particles in MJO5b and MJO5c had increased the cutting temperature. This might be attributed with the enhancing of abrasive wear due to the presence of excessive hBN particles [13]. The increment of abrasive wear accelerates the cutting temperature.…”

“…However, the increment of hBN particles in MJO5 causes abrasive wear to occur at the contact surfaces. This was due to the rubbing process from the hBN particles at the contact surfaces that increased the friction between tool and workpiece [13]. Fig.…”

Nanofluids

“…What is more, ultrafine-tungsten disulfide particulates could form a WS2 film with low shear stress by adsorbing and depositing in the hollowness of abrasive surface, making the abrasive surface be more smooth, and the FeS film formed in tribology reaction could protect the abrasive surface further, all of which realize the self-repair to abrasive surface. The tribological properties of liquid paraffin with SiO 2 nanoparticles additive made by a sol-gel method was investigated by Peng et al [89]. The optimal concentrations of SiO 2 nanoparticles in liquid paraffin was associated with better tribological properties than pure paraffin oil, and an anti-wear ability that depended on the particle size, and oleic acid surface-modified SiO 2 nanoparticles with an average diameter of 58 nm provided better tribological properties in load-carrying capacity, anti-wear and friction-reduction than pure liquid paraffin.…”

Lube Oil Wear Reduction via Organic Tribofilms

“…Moreover, the technology of protecting machines entirely depends on the quality of lubricants. The addition of nanomaterials as additives in base lubricant oil is a rapidly progressing field of research, because nanomaterials are different from traditional bulk materials due to their extremely small size and high specific surface area [6]. Different researchers have tried a variety of nanomaterials dispersed base oils to improve the wear and friction reduction [7,8].…”