Abstract
Titanium dioxide nanoparticles (TiO2) were synthesized and then dual-coated with silane coupling agent (KH-570) and OP-10 in sequence in order to be dispersed stably in water as lubricant additives. The tribological properties and the application performance in Q235 steel machining of the nanoparticles as water-based lubricant additives were investigated on an MSR-10D four-ball tribotester and on a bench drilling machine, respectively. Scanning electron microscope (SEM) and atomic force microscope (AFM) were used to analyze the worn surface. The results show that the surface-modified TiO2nanoparticles can remarkably improve the load-carrying capacity, the friction reducing, and anti wear abilities of pure water. The wear scar diameter and the coefficient of friction of the water-based lubricating fluids with TiO2nanoparticles decreased, and the thick deep furrows on the surface of wear scar also decreased obviously with the increase of TiO2concentration. The power consumption in drilling process was lower and the cutting surface was smoother using the water-based lubricating fluids added TiO2nanoparticles compared to the fluid without addition. The reason for nanoparticles improving tribological properties of water based lubricating fluid might be the formation of a dynamic deposition film during rubbing process according to analysis of the worn surface.
Highlights
Environment protection and energy conservation are becoming very important issues in modern industrial production
Scanning electron microscope (SEM), atomic force microscope (AFM), and energy dispersive spectrometry (EDS) were used to examine the morphology and chemical composition of the wear scars and to study possible tribochemical changes involved in the friction process
It can be thought that the dual-coated TiO2 nanoparticle has good load-carrying capacity and excellent extreme pressure property
Summary
Environment protection and energy conservation are becoming very important issues in modern industrial production. Among all of the studies on water-based lubricant additives, nanoparticles arouse our interest because there have been a lot of researches on nanoparticles as additive in traditional oil-based lubricant and the nanoparticles exhibit good antiwear and friction reducing properties [10,11,12,13,14,15,16,17,18]. Some researchers have found that Fe2O3, CeO2, and diamond nanoparticles as water-based lubricating additives can significantly reduce the friction coefficients and improve anti-wear properties [19,20,21]. The antiwear and friction reducing mechanism of the dual-coated TiO2 nanoparticles as water-based lubricant additive was discussed according to SEM and AFM analysis of the worn surfaces
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