Abstract
The addition of various extreme pressure (EP) and anti-wear (AW) additives in lubricating oil is an important and effective way to reduce friction and wear. The application of chemico-thermal treatments on the surface of materials is another effective way for improving the tribological behaviour of rubbing pairs. In this paper the synergistic effects of two EP AW additives, sulphurized olefin and tricresyl phosphate, with an oxynitrided surface of 1045 steel on the tribological behaviour were studied systematically on a ‘ball-on-disk’ testing machine. An excellent result of increasing load-carrying capacity and reducing friction and wear was obtained. The mechanism of this synergistic effect was discussed based on the microanalysis of surface film by AES and XPS.
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