ENERGY LEVELS OF CONTACTS IN THE FRICTIONAL INTERACTION OF METAL-POLYMER AND SEMICONDUCTOR MATERIALS
Journal Title: Проблеми тертя та зношування - Year 2018, Vol 81, Issue
Abstract
The materials of the article show the types of contacts of microprotrusions of metal-polymer and semiconductor materials. The latter are modified in the form of tablets into the working surface of the polymer linings. Energy levels of microcontacts of friction pairs are illustrated. In the polymer lining, composed of inhomogeneous materials, there are amorphous and crys-talline phases, there is a capture of a different kind - at the interfaces. When such a material is electrified, carriers will collect near this interphase boundary or vice versa, leave it, depending on which of the two conduction currents is greater: flowing to the charge boundary or leaving it. Differences in local conduction currents also lead to charge dissipation during the subse-quent conduction of a thermally stimulated discharge, since in this case the currents flow in the opposite direction. A large increase in the work function of ions from the surface layer of the lining gives affinity to the electron. Purposeful reorientation of electrons to ions thus makes it possible to achieve equality of particle work due to this effect. When the working surface of the polymer lining reaches a temperature higher than permissible for its materials, burnout in the surface and subsurface layers of bonding components, which leads to the formation of liquid islands on the surface of the lining. It is believed that at the same time on the surface of the metal in contact with the liquid, a double electric layer is formed. The surface of the metal as a result of loss or trapping of ions acquires some chemical potential, and a certain charge is distributed over it. The opposite sign of the charge is in the liquid. In this case, the surface of the metal acquires some specific potential, establishing an equilibrium between the process of separation and deposition of ions. This potential depends on both the nature of the metal and the concentration of ions in the liquid. The polarization of the contact spots of the micropro-trusions of the lining arising under these conditions is caused precisely by the presence of elec-trodes. This situation is rather easily explained in the limiting case when there is no mobility in carriers of any one polarity (for example, electrons) and there is no further generation of free carriers. With a decrease in the thickness of the polymer film, a situation may arise when the charges concentrated near the opposite boundaries of the contact in question begin to interact with each other, leading to a distortion of the potential barrier shape. The greatest thickness of the film, at which the interaction of boundary charges begins, can be considered the double value of such a contact parameter as the depth of penetration of the surface charge. The in-teraction of near-surface charges can cause a local minimum to form in the middle of the bar-rier, which in principle can lead to the intersection of the curve describing the envelope of the potential barrier with the Fermi level. Thus, the energy levels of various types of contacts of microprotrusions of friction pairs were estimated and their effect on the total energy load was illustrated.
Authors and Affiliations
A. I. VOLCHENKO, D. YU. ZHURAVLOV, M. V. KASHUBA, V. S. VYTVYTSKIJ
Keywords
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