Determination of tribotechnical properties of polymers depending on the test conditions

Mechanical Engineering Research Institute of the Russian Academy of Sciences, 4 Maly Kharitonyevsky Pereulok, 101990 Moscow, Russia

^* Corresponding author: laser-52@yandex.ru

Abstract

The paper presents the results of morphological and tribotechnical tests of samples of ultrahigh molecular weight polyethylene (UHMWPE), high molecular weight polyethylene (HMWPE), polyethylene terephthalate (PET), polyoxymethylene (POM). Tribotechnical tests were carried out on a friction machine with a vertical axis of rotation of the spindle according to the scheme: “the end of the annular surface of the counter–flange sleeve (steel 40Kh, 48-52 HRC) is a plane (wide side of the polymer sample).” The moment of friction and the load on the samples were determined using strain gauges placed in the friction machine in continuous mode. The effect of the surface roughness of a 40Kh steel counter-tile on the friction coefficients when tested without lubricant and in the presence of hydraulic oil MGE-10A at a constant sliding speed has been established. The maximum values of the friction coefficients were obtained during friction without lubrication after processing the end face of the counter-tile with sandpaper P180 and P1200. The minimum values of the friction coefficients were obtained by lubricating MGE-10A after processing with sandpaper P1200 of a 40Kh steel counterplate. According to the morphology of the friction surfaces, the main wear mechanisms for UHMWPE, micro-cutting, HWMPE and PET, micro-cutting and plowing and for POM, fatigue wear and plowing are determined.