Effect of volumetric modification with nanosized zirconium dioxide particles on structure and mechanical properties of composite material based on polytetrafluoroethylene

Abstract

The article demonstrates the influence of the concentration of nanosized particles of zirconium dioxide ZrO₂ applied as a bulk modifier-filler on the structure and strength characteristics of polytetrafluoroethylene-based composite. samples with concentrations of 0 %, 4 %, 8 % and 26 % of ZrO₂ nanosized zirconium dioxide particles were obtained by the sintering method in a mould in conditions of volumetric limitation of thermal expansion. The authors analyzed the structural-chemical state and elemental composition of the samples by X-ray photoelectron spectroscopy using Surface Science Center (Riber) and scanning electron microscopy with application of energy-dispersive analysis. Moreover, the hardness was determined on a Shore type A TWR-AM (durometer) with an analogue indicator. Wear tests were carried out on the UMT-2168 universal friction machine by the mode without lubricating fluid at the 5 N constant load, peripheral speed with the 0,32 m/s abrasive sheet. The results of the conducted research were confirmed under full-scale test conditions. As a result, the authors present recommendations on the percentage composition of nanosize filler in polytetrafluoroethylene for seals in friction units.