Effect of Surface Roughness and Particle Size on Lubrication Mechanisms of SiO2 Nanoparticles. (18th October 2022)

• Record Type: Journal Article
• Authors: Kong, Linghui; Zhang, Lei; Bao, Yueyue; Liu, Dong; Liu, Shutan
• Other Names: Zang Zhigang Academic Editor.
• Is Part Of: Advances in materials science and engineering. Volume 2022(2022)
• Publication Date: 2022-10-18
• Subjects: Materials science -- Periodicals; Materials science; Periodicals; 620.11
• DOI: 10.1155/2022/7051650
• Languages: English
• ISSNs: 1687-8434

Abstract

Abstract : In this study, a series of tribological tests were conducted on a pin-on-disc tester to study the lubrication mechanism of SiO2 nanoparticles under different surface roughness considering various loads and velocities. For a comprehensive understanding of the mechanism of SiO2 nanoparticles, base fluid was also employed as a contrast. Results show that the reductions of friction coefficients and wear scar widths increase with the decrease of surface roughness, due to the increase in rolling effect and self-repairing mechanism of SiO2 nanoparticles. The lubrication mechanism of SiO2 nanoparticles is the rolling effect when the height-diameter ratio ( λ ) is less than 6, and the self-repairing mechanism at λ of 6 and 10, whereas, there is no obvious difference by adding nanoparticles when λ is 20. When the height-diameter ratio is less than 6, surface wears show an increasing trend as the load increases due to the high hardness of nanoparticles, while it is the opposite at λ of 10 and 20 because of the self-repairing mechanism.