Tribochemical reactions on sliding surface of the sintered metallic brake linings against SiC ceramic brake disk

The research presented in this paper is focused on formation, structure and chemical composition of friction layer on sintered metal–matrix brake linings sliding surface at early stage of braking against SiC ceramic. The character of the friction layer formed at sliding temperatures 200, 300 and 400 °C was investigated using scanning electron spectroscopy (SEM), Auger electron spectroscopy (AES) and X-ray photoelectron spectroscopy (XPS). In this starting stage of braking we confirmed the two-layer oxide structure of the friction layer composed from CuO on the top and Fe2O3 below. There is practically no change between structure, thickness and composition of the friction layer formed on sliding surface of the sample with only metallic matrix and the sample with the addition of graphite.