Abstract
A four-ball tester was used to evaluate the anti-wear and friction-reducing performance of a blend of 2,5-bis((9,9-dimethyldecyl)disulfanyl)-1,3,4-thiadiazole (referred to as T561) and molybdenum naphthenate (referred to as MoNAP) in hydrogenated oils. The results indicate that the blend of T561 and MoNAP (referred to as TMoNAP) has excellent anti-wear and friction-reducing properties, as well as good load-carrying capacity. Then, X-ray absorption near edge structure (XANES) spectroscopy was employed to provide further insight into the chemical composition of films generated from thermal oxidation and friction process. According to the results, thermal films are composed mainly of ferrous sulphate, whereas anti-wear films are composed mainly of ferrous sulphide, ferrous disulphide, sulphite, ferrous sulphate, molybdenum disulphide, and molybdenum oxide. The mechanisms of friction reducing and anti-wear are discussed.
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