Kuzyshyn O. Formation and characteristics of nanofilms out of inorganic and organic liquids on metallic surfaces during the dynamic contact under condition of superhigh pressure

The thesis is dedicated to the investigation of nanofilms characteristics formed out of inorganic and organic liquids on metallic surfaces during the dynamic contact under condition of high and superhigh pressure. By means of the complex of viscous and temperature liquid characteristics it is presented that there are some nonlinear connections between these data and critical loading on nanofilm. It has induced to look for other evaluative criteria of nanofilm characteristics. The formulas for hydrodynamic effects calculations and nanofilm thickness in the contact of two solids, which accuracy and reliability are confirmed experimentally and according to the contact hydrodynamic theory of lubrication taking into account reduced rheological parameter, have been obtained. The dependencies of critical loading and protective functions as to the wear of contact surfaces from the hydrodynamic effects and nanofilm thickness produced by vegetable oils and their chemical modifications, mineral, naphthenic and polybutenic oils, potassium silicate, polyglycolic, perfluoropolyethereal and other synthetic liquids have been investigated and correlative relations between these dimensions have been determined. The properties of the nanofilms produced out of chemically modified rape oil in condition of dynamic contact under superhigh pressure have been studied. Alongside it is shown that the superhigh data of critical loading which nanofilms sustain and their protective functions as to the wear of contact surfaces can be attained by means of sulfurization, oxyethylization or both processes together. The sulfurized rape oil composition according to the relative hydrodynamic effects, nanofilm thickness and the diameter index of wear stain and intensity of volumetric deterioration has been optimized by means of mathematical planning and experiment analysis methods.