The evolution of the nano-mechanical properties of tribofilms formed in steel/steel, steel/a-C:H and steel/Si-DLC contacts lubricated with two commercial oils containing different amounts of SAPS ...additives (E6 and E7 grade) and a mineral base oil containing ZDDP additive were examined in this investigation for two very different time periods. An atomic force microscope (AFM) was used in different modes to measure the topography, film thickness and stiffness, while the nano hardness was measured with a nano-indenter. In addition, FTIR microscope was used on selected samples to explain some of the tribofilmʼs mechanical modifications with chemical changes. The results have shown that the tribofilmʼs evolution and growth are very much surface and additive dependent, and are different for steel and DLC coatings.
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