INFLUENCE OF LOW-FREQUENCY MODULATIONON MECHANICAL PROPERTIES AND TRIBOTECHNICAL CHARACTERISTICS OF POLYMER COMPOSITE MATERIALS

doi: 10.25712/ASTU.2072-8921.2021.04.018

Abstract

Improving the technology of cold pressing and obtaining finished products with increased operational properties from polymer composite materials is an urgent task of modern materials science. This article presents the results of a study of the effect of ultrasonic action with a simultaneously superimposed low-frequency amplitude modulation on the physical properties and tribotechnical characteristics of a polymer composite material based on polytetrafluoroethylene modified with hexagonal boron nitride. It has been established that the mode of pressing a composite material using ultrasonic action with a frequency of 17 kHz and simultaneously superimposed low-frequency amplitude modulation of 100 Hz allows increasing the mechanical properties: tensile strength by 10-18%, relative elongation by 11-20%, elastic modulus by 13-19%, hardness 4%. Based on the studies of the tribotechnical characteristics of PCM based on PTFE modified with hexagonal boron nitride 5 wt. % there is a decrease in the intensity of mass wear by 39%, the coefficient of friction by 11%.