Research the effect of additives on tribological characteristics of lubricant material and morphology of friction surfaces

Abstract

At present, special attention is paid to the issues of increasing the wear resistance of the surface layers of the material of rubbing parts and reducing the energy consumption for friction. It is possible to form surface films with high tribological properties by introducing various metal-containing additives into the base oil, which, depending on the design and technological features of the friction pair and operating conditions, can differ significantly. In order to study the mechanism of action of various additives to oils from the point of view of the formation of surface layers with effective operational properties, the tribological properties of experimental lubricating compositions were determined and the morphology of the friction surfaces of machine parts was investigated. For comparative tests, the following additives were chosen as samples - MOTOR DOKTOR (MANNOL) and the metal-cladding additive Cluster. As a result of laboratory tribological tests of friction samples on pure MS-20 oil and containing tribological preparations MANNOL (MOTOR DOKTOR) and Cluster, it was found out that the use of the Cluster nanoadditive led to a decrease in the friction moment by 80% in comparison with the additive MANNOL (MOTOR DOKTOR) and 1.48 times compared to MS-20 oil. During the test, the wear of the pad of the model friction pair operating on MS-20 oil with the Cluster additive decreased by 3 times compared to the wear on MS-20 oil with the MANNOL additive (MOTOR DOKTOR) and 26 times compared to the base oil MS-20. On the working areas of the friction surfaces of the model samples after their operation on MS-20 oil with MANNOL (MOTOR DOKTOR) and Cluster additives, the formation of films of various nature and secondary structures is observed, which are manifested by a specific relief structure. Such a change in the surfaces of the working sections is associated with the peculiarities of the influence of various compositions of additives in the oil not only on the processes of friction and wear, but also on structural and phase changes in the surface layers of metals in friction samples.