Investigation of the Influence of the Type of Motion Friction on the Behavior of Anti-Wear Additives

The influence of the type of motion friction (sliding/rolling) on the behavior of antiwear additives of lithium grease has been investigated. The tests of plastic lubricant on wear under conditions of sliding friction on a four-ball friction machine (FBFM-1) and as a part of a rolling bearing have been carried out. The multidirectional influence of additives on tribological properties of plastic lubricants is shown. Introduction of detonation nanodiamonds into lithium plastic lubricants (PLs) in concentration of 0.3% by mass in conditions of rolling friction leads to decrease of friction coefficient in relation to basic PLs by 2 times and increase of relative life. In conditions of sliding friction the antiwear properties are improved by 1.7–1.9 times. Addition of tricresyl ether of orthophosphoric acid (TKF) to lithium PLs in rolling friction conditions leads to increase of friction coefficient by 3.65 times and decrease of relative life, and in sliding friction conditions increases antiwear properties by 1.9 times. The results of research allow us to pick the optimum composition of additives depending on working conditions of a friction unit.