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

The influence of the type of motion friction (sliding/rolling) on the behaviour of anti-wear 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 PL in concentration of 0.3 % by mass in conditions of rolling friction leads to decrease of friction coefficient in relation to basic PSM in 2 times and increase of relative life. In conditions of sliding friction the anti-wear properties are improved by 1.7—1.9 times. Addition of tricresyl ether of orthophosphoric acid (TKF) to lithium PL in rolling friction conditions leads to increase of friction coefficient in 3,65 times and decrease of relative life, and in sliding friction conditions increases anti-wear properties in 1,9 times. The results of researches allow to pick up optimum composition of additives depending on working conditions of a friction unit.

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