Abstract
The tribological behaviour of five base oils and their chromatographically separated hydrocarbon type fractions was investigated during steel-steel tribocontact using a fourball machine. It was found that the clay finished base oils, in comparison with the hydrofinished stocks, showed better wear behaviour owing to partial hydrodesulphurization which occurred during refining. The parent base oils gave higher wear rates than the saturate and monoaromatic fractions separated from the clay finished base oils. All the test data are analysed and discussed, and the observations are supported by scanning electron microscopy. Possible correlations between the lubrication properties of the stocks and the average number of alkyl carbon atoms per alkyl substituent and the molecular weight are reported.
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