EVALUATION OF THE EFFECTS OF ZDDP AND GRAPHENEADDITIVES IN PAO 8 OIL ON THE TRIBOLOGICAL PROPERTIESOF TIALN COATING

Abstract

This paper investigates the tribological effects of graphene and anti-wear zinc dialkyl dithiophosphates(ZDDP). Friction tests have been carried out on a tribological tester which operates as a ball and disc assemblyin a frictional, sliding motion. Tests were carried out with a load of 10 N over a sliding distance of 1000 m.TiAlN coated HS6-5-2C steel discs, and 100Cr6 steel balls were used in the tests. Tests were conducted underlubrication conditions with poly()olefin oil PAO 8 with graphene and/or ZDDP. The chemical compositionof the TiAlN coating was studied using a scanning electron microscope, and the wear marks on the discs andballs were observed. The geometric structure of the samples was analysed before and after the friction testsusing a confocal microscope with interferometric mode. The results indicated that the addition of ZDDP andgraphene to the poly()olefin oil had an effect on reducing the friction coefficient.