TRIBOLOGICAL CHARACTERISTICS OF LUBRICANTS MODIFIEDWITH BIO-ADDITIVES

The article presents the results of tribological analyses of oil compositions and their temperature-adhesivecharacteristics and lubricity. The parameters of tribological tests carried out using a T-05 tribotester designedto analyze the tribological properties of lubricants. For the purpose of the study, the following samples wereused in the analysis of friction and wear: (i) blocks made of X153CrMoV12 steel of 60 1 HRC hardness,whose friction surface roughness parameter Ra ranges from 0.09 to 0.17 μm, and (ii) rings made of 100CRsteel of 58 1 HRC hardness, whose friction surface roughness parameter Ra ranges from 0.39 to 0.62 μm.The tests were performed at a constant rotating speed of the ring (30 rotations per minute) and a block pressedwith a force varying from 100 to 1,100 N under continuous lubrication. The authors determine the coefficientof friction on the basis of the recorded values of the friction and pressure forces. Ra is measured and the frictionsurface topography is observed after tests. Boundary friction is present in all the oil compositions analyzedand the coefficient of friction ranges from 0.09 to 0.18 under the test conditions. Ra is observed to have risenafter the tests in the friction surfaces of the block samples.