Abstract
Thermodynamic analysis of the cyclic process of contact appearance and breaking in a closed system is used to develop a mathematical model of friction and wear of polycrystalline solids without lubrication and with boundary lubrication. When calculating friction in the case of boundary lubrication, it is assumed that the clearance in the contact is a microbearing with a mobile wall, while the adsorption is described by the Dubinin-Radushkevich equation. Because the physically sorbed molecules are not localized on the surface, the conditions of existence of the lubrication layer is the equality of its counterpressure to the normal pressure in each contact point. The counterpressure of the lubricating layer was found by integration of the Pointing equation describing the condition of equilibrium of two phases (the lubricating layer and the gas phase) coexisting under different pressures and at the same temperature. Comparison of the calculated and experimental results confirms the adequacy of the advanced model.
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