Additions of reinforced fibres in layered polymers and their effect on wear resistance

Abstract

This paper describes a study of layered polymers with the addition of reinforcing fibres. Their advantages are strength and stiffness, lightness and improved chemical resistance. The study deals with a comparative evaluation of the wear resistance of textolite with different reinforcing fibres under sliding friction conditions. A sample of the investigated material, made in the form of a disc, was fixed in the centre of the table surface and driven into rotational motion at a given frequency. A 6 mm diameter ball made of 100 Cr6 steel was used as a control sample, which was rigidly fixed in the end of a cylindrical pin (indenter). A normalised normal load was applied to the indenter, which was resting on the disc at some distance from the centre of rotation. During the tests, the coefficient of friction and the depth of penetration of the ball into the test sample were continuously measured. The tests were carried out with increasing and decreasing of the load with the interval of 2,0 N. The duration of the long-term wear tests for each sample was 21500 m of friction path (about 20 hours). The estimation of fixed changes of the friction coefficient from load at tests on wearability of couplings has been carried out. The results of tests of the investigated materials samples have shown the best indices on the intensity of wear at mating with a sample from textolite PTG compared to oxafen and Kevlar, accordingly, in 2.97 and 5.93 times.