The tribological behavior of polytetrafluoroethylene/Kevlar (PTFE/Kevlar) fabric was investigated under different contact stress loads. The prepared PTFE/Kevlar fabric and GCr15 steel were used to form a friction pair, and the tribological properties of the material were tested using a reciprocating friction and wear tester. A stereo microscope, a three-dimensional optical profiler, a field emission scanning electron microscope, and an energy dispersive spectrometer were used to conduct macro- and micro-analysis on the fabric’s wear scar. The results indicated that the friction factor of the PTFE/Kevlar material decreased and then increased as the load increased. The material showed the best tribological performance when the maximum contact stress was 84 MPa (2 N). The friction behavior between the fabric and the GCr15 steel consisted of continuous production, peeling, and regeneration of the PTFE transfer film as the load increased. The wear surface of the fabric showed fiber abrasion and significant wear damage at a contact stress of 143 MPa (10 N). The wear mechanism of the fabric consisted of fatigue wear, abrasive wear, and some oxidative wear.
This study focuses on the impact-sliding wear behaviour of CrN and WC/C tool protection coatings against Si3N4 ceramic material using a self-developed impact-sliding device. The wear mechanisms and tribochemical behaviour of the CrN coating and WC/C coating were compared and analysed using an optical microscope, 3D optical microscope, scanning electron microscope, energy-dispersive X-ray spectroscopy, electron probe microanalyzer, and X-ray photoelectron spectroscopy. The results showed that the WC/C coating exhibited very slight and uniform wear damage under impact-sliding conditions and the wear performance was much better than that of the CrN coating. Especially in the impact zone, the CrN coating showed peeling damage that greatly reduced the wear resistance to impactsliding. The impact-sliding damage mechanisms of the CrN coating consisted of micropeeling and plastic deformation, whereas those of the WC/C coating included deformation coordination and slight plastic deformation. The wear mechanisms of the CrN and WC/C coatings for the impact-sliding condition were fatigue wear, abrasive wear, and oxidation wear.
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