The aim of the present work is to determine the influence of surface layers containing boron on the friction
parameters in sliding pairs under mixed friction conditions. The tribological evaluation included three production
methods of surface layers with boron; pack boronizing, laser boronizing, and TiB2 coating deposited on 46Cr2 steel.
Modified surface layers of ring specimens with 46Cr2 steel were matched under test conditions with a counterpart
made from AlSn20 bearing alloy. Tested sliding pairs were lubricated with 5W/40 Lotos synthetic engine oil. The
applied modification technologies of the surface layer of steel allowed for obtaining construction materials with predetermined
tribological characteristics required for the elements of sliding pairs working undermixed friction
conditions. The results showed differences in the wear of bearing alloy, as the effect of the interaction between the cooperating
surface layers and of the physiochemical changes of their surfaces, induced by external forces. The TiB2
coating generated the highest friction resistance and bearing alloy wear. The pack borided surface layer reduces the
friction coefficient, the moment during the start-up of the frictional pair and the wear of the bearing material. The
analysis of the surface layer indicated that the content of aluminum on pack borided ring specimens reached 21%, and
on the TiB2 coating, it exceeded 8%.
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