Abstract
In this paper tribo-comparison of two SLs viz. graphite and PTFE as a secondary lubricant in composites with identical composition (20 wt%) is presented. The mechanical, thermal and tribological properties as well as mechanism of PAEK composites were investigated in detail. It was found that although incorporation of PTFE reduced most of the mechanical properties and thermal conductivity, it was responsible for increasing the tribo- potential of composites to a significant level. Compared to a composite with graphite as a secondary SL, a reduction in wear rate (18–30 %) and friction (2–18%) was exhibited due to PTFE and nano-PTFE. The composites showed very high PVsafe (pressure x velocity) value of 182 MPa m/s with low (0.04) and wear rate (1.33×10−16 MPa m/s). It was shown that the formation of a polymeric transfer film on a metal countersurface is crucial in achieving ultralow wear and friction in dry condition. The investigations on worn surfaces and the transfer films with scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) analysis and Raman spectroscopy proved useful to understand wear mechanisms.
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.
