Changes in the physical and mechanical properties of friction composites with a polymer matrix induced by an amplitude-modulated high-frequency electromagnetic field

This paper presents the results of experimental studies of the influence of a high-frequency electromagnetic field on the physical, mechanical, and tribological properties of polymer friction composites for automotive brakes. It was shown that, in some cases, the treatment with an electromagnetic field results in the transformation of the polymer supramolecular structure. In the case of treatment of initial powder compositions, significant changes (up to 20%) in the dynamic modulus of elasticity and the tribological properties of the final materials were found. The possible mechanisms of the effect of pulsed high-frequency electromagnetic treatment on the physical and mechanical properties of friction materials, as well as the correlation of the properties with the acoustic noise of friction units, are under discussion.