Tribological properties and lubricating mechanism of SiO2 nanoparticles in water-based fluid

17th IUMRS International Conference in Asia

Bao, Y.Y.^1 ; Sun, J.L.^1 ; Kong, L.H.^1

School of Material Science and Engineering, University of Science and Technology Beijing, 30 Xue Yuan Road, Beijing, China^1

关键词: Antiwear property;    Element chemistry;    Friction coefficients;    Lubricating mechanism;    SiO2 Nanoparticles;    Tribological properties;    Water-based fluids;    Water-based lubricants;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/182/1/012025/pdf
DOI  :  10.1088/1757-899X/182/1/012025

来源: IOP

【 摘 要 】

The tribological properties of surface modified SiO2nanoparticles suspension in water-based lubricant have been studied. SiO2(30 nm) nanoparticles were dispersed through surface modification with polyethylene glycol-200. Transmission electron microscope (TEM) and infrared (IR) spectroscopy show that SiO2nanoparticles disperse well and stably in the water-based lubricant. The diameter of the nanoparticles is about 60 nm. Tribological properties of the water-based lubricant were evaluated using four-ball wear test machine and pin-on-disk tester under different loads and different concentrations of SiO2nanoparticles. Wear surface morphology, element chemistry configuration of steel balls and steel rings were studied by means of X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). Results show that the tribological properties of the water-based fluid have been improved by addition of nanoparticles ranging from 0.1% to 0.3% concentrations. SiO2nanoparticles deposited onto the wear surface during the sliding, which helped to reduce the friction coefficients and increase the anti-wear properties due to the miniature ball bearing effect and self-repairing performance of nanoparticles between the friction pairs. With the increase of test load, the friction coefficients decrease but the wear of the surface increase.