Abstract
Abstract The tribological behaviours of two types of tribo-pairs (Si3N4/GCr15, GCr15/GCr15) lubricated with 4010 aviation lubricants (4010AL) containing different concentrations (0–0.3 wt%) of few layer graphene (FG) were investigated using a four-ball testing machine. Atomic force microscopy (AFM) and Raman spectroscopy were employed to characterise the structure and morphology of FG. Laser scanning confocal microscopy (LSCM), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and Raman spectroscopy were employed to investigate the worn surface. The test results demonstrated that the frictional properties of the Si3N4/GCr15 pairs were significantly improved after adding FG into the base lubricating oil. With the lubricating oil containing 0.075 wt% FG, the friction coefficient and wear scar diameter were reduced by 27% and 43%, respectively. On rubbing surfaces, disordered graphene was obtained as examined by EDS and Raman measurements. The lubrication mechanism was investigated to explain the enhancement in the friction-reduction and anti-wear properties, which can be attributed to shearing, tearing, and filling of FG as well as its adhesion to rubbing surfaces, and the mechanical contact between frictional interfaces was avoided.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
