Wear-Resistant Polymer Composites Based On Polytetrafluoroethylene And Layered Silicates

Abstract

To improve interaction on the phase boundary of polymer composites, we used functional additives, mechanoactivation method, and ultrasound. In the case of the use of serpentine as a modifier of polytetrafluoroethylene (PTFE), the introduction of magnesium nanospinel (NS) as functional additive resulted in the increase of wear resistance of composite in 2500 times. Effect of ultrasonic irradiation on the composites comprising phlogopite was considered. IR data have shown that NS influences the intensification of the tribological processes. In sonicated composites the intensity of the IR spectra of oxidized fragments depends on the content of NS and correlates with the wear resistance.

Preparation and Tribological Behaviors of Antigorite and Wollastonite Mineral Dual-Phase-Reinforced Polytetrafluoroethylene Matrix Composites

“…The O1s spectrum can be fitted into subpeaks representing metal oxides (530. 13 For the worn steel surface rubbed against the (10Atg + 20Wl)/PTFE composites, the intensity of the spectra increased, and the positions of the fitted subpeaks and corresponding substances changed completely. The C1s spectrum can be fitted into subpeaks representing graphite (284.8 eV), polluted carbon (285.52 eV), organic matter (286.8 eV), and (C 2 F 4 ) n at 288.03 eV.…”

“…Based on research on lubricant additives, studies on improving the mechanical and tribological properties of PTFE using phyllosilicate powders, such as serpentine, attapulgite, and sepiolite, as fillers have attracted considerable attention in recent years owing to their ability to intercalate monomers or polymer molecules [13,14]. This is an effective approach to avoid organic modification of mineral powders and solve the problem of powder additive dispersion stability in lubricants by introducing phyllosilicate minerals into polymers to improve their tribological properties.…”

Mechanical and Tribological Properties of Polytetrafluoroethylene Composites with Carbon Fiber and Layered Silicate Fillers

“…However, the mechanical properties of the polymer composites were significantly poorer than pure PTFE. A more significant improvement in the tribological behavior was obtained in their later study [12], in which PTFE was filled with layered silicates, such as serpentinite, phlogopite, and their mixtures; the mass wear rate increased by 2500 times compared to pure PTFE. However, the strength and elongation at break of the composites were lower than those of pure PTFE.…”