This paper considers the use of contact electrical conductivity to analyse boundary lubrication at various temperatures. The main mechanisms of contact conductivity within the temperature range typical of lubricated tribosystems are discussed. Special equipment is described for temperature investigation and experimental data are presented on electrophysical methods. Model experiments with static nominal point contacts bring to light some peculiarities of the behaviour of boundary films when heated. Analysis of electrical and frictional characteristics under sliding shows the contact resistance method to be promising in the thermal testing of boundary films. Abstract boundary layer, contact conductivity, thermal tests, lubricated point contact Keywords Nomenclature
The influence of heating on the properties of lubricating layers formed on steel by inactive and chemically active lubricant components has been studied by electrical probe methods. Model experiments combining X-ray photoelectron spectroscopy analysis and measurements of friction and electrical characteristics in static and dynamic point contact have shown the approach to be promising in separate studies of the properties of the physically adsorbed layer (A-layer) and chemisorbed It has been confirmed that D-layers can be formed on metal surfaces at moderate temperatures (T -200°C) by both active additives and inactive components of mineral oil. Zinc dialkyldithiophosphate additives provide higher load-bearing capacity of the A-layer compared to pure mineral oil and can form D-layers on steel at relatively low temperatures (of about 1 OO'C). Lubricating layers with different physicomechanical and frictional properties can be formed depending on the chemical origin of the lubricating medium and the temperature regime. ' layer (D-layer) of deposits.
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