EXPERIMENTAL STUDIES OF TRIBOSYSTEMS IN THE PRESENCE OF FULLERENES IN LUBRICANT. PART 2. BY PARAMETER OF LOADING AND SPEED RANGE
The paper presents the results of experimental studies of the volumetric wear rate and friction coefficient when using fullerene compositions in the lubricant and changing the load-speed range of operation. The rational content of fullerene composition consisting of fullerene fine powder, pre-dissolved in vegetable high-oleic rapeseed oil, is substantiated and experimentally confirmed. It is proved that a rational concentration can be a theoretically substantiated and experimentally confirmed average value: 0,75 g/kg of fullerenes + 99,25 g/kg vegetable high oleic oil, as a solvent, followed by addition to the base oil. The direction of reducing the volumetric wear rate by increasing the concentration of the fullerene composition is more than 100 g/kg can be considered ineffective and experimentally confirmed. Experimental results have been obtained that confirm the hypothesis of the formation of a lubricating film on the friction surface of tribosystems in the presence of fullerene compositions in lubricants. The degree of influence of fullerene compositions on the volumetric wear rate is established, which allows to draw a conclusion about the adequacy of the developed mathematical model to the experimental data. The decrease in wear rate is 20...25%, the simulation error is 5,2...14,0%. Experimental studies have shown that the use of fullerene compositions most effectively reduces the coefficient of friction (by 32,4 ... 86%), compared with the wear rate (by 20 ... 25%). Based on these results, it is concluded that the fullerene composition in liquid lubricants is antifriction and to a lesser extent antiwear. It is experimentally established that the use of fullerene compositions in lubricants has a rational load-speed range of operation. In this range there is a maximum reduction of the coefficient of friction.