Abstract
We have studied the chemistry of S species in tribofilms generated on steel blocks from belt-drive continuously variable transmission fluids using x-ray absorption near-edge structure (XANES) spectroscopy. First, we examined S K-edge XANES spectra of tribofilms generated using a friction tester from four kinds of fluid which have different friction properties. It is suggested that sulphides such as FeS, alkyl sulphide and ZnS in the tribofilms might increase the friction coefficients of the tribofilms. Second, we examined the XANES spectra of tribofilms collected in both fluorescent yield (FY) and conversion electron yield (CEY) modes. FY and CEY spectra of a fluid were compared and it is found that ZnS content in the surface region might be higher than that in the bulk. On the other hand, the chemistry of the S species in the other three tribofilms might be almost uniform as far as the near surface and the bulk are concerned.
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