Tribological Properties of a Friction Composition of MetalCeramic Powders and Carbon-Containing Additives on a Polymer Binder Material

Research has been carried out on the wear resistance and friction coefficients of a friction composition made from PC30, Al₂O₃, SiO₂, TiO₂, Cr₂O powders and an additive containing carbon fiber in combination with GE-1 graphite, using the SFP-012A phenolic powder binder material. The study of tribotechnical properties was carried out on an inertial stand type IM-58. Using a stereoscopic microscope and a scanning electron microscope with a micro-X-ray spectral attachment, the morphology of the friction surfaces of experimental samples was analyzed, and information was obtained about the elements forming the friction surface. It has been established that promising additives for the friction composition are 5—6 % coarse Al₂O₃ and SiO₂ powders. They help increase the coefficient of friction of the friction material to the recommended minimum value of 0.3. Promising additives also include carbon fiber in an amount of 25—50 %, which makes it possible to maintain the wear rate of the composition at a level not exceeding 30 µm/km. By increasing the carbon fiber content to 50 %, a minimum value of the friction coefficient was obtained at the initial moment of contact of the tribo-mating surfaces. In this case, the experimental curve of changes in the friction coefficient is characterized by a smooth transition to the slipping region.

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