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Nanoscale mechanical and topographic characteristics of boundary films and their relation to macroscopic friction
Kalin, Mitjan ; Oblak, Eva, 1987-
Properties of the tribochemical films play an important or even key role for friction in boundary lubrication. While their chemical behavior is already broadly studied, the mechanical properties are ...much less known. However, their nano-scale mechanical properties and behavior may reveal important correlation to macroscopic friction behavior, which was studied in this work. Steel and DLC contacts lubricated with fully formulated low-SAPS and high-SAPS commercial oils were studied, and compared to well-known ZDDP tribofilms. Tribofilms were characterized with atomic force microscope (AFM) with 6 different parameters: namely, topography, nano roughness, adhesion, film thickness, nanoscale friction (LFM) and film stiffness through force modulation (FMM). Results confirmed that film formation and its nano-scale properties are both, surface and additive dependent. Moreover, correlation between macro friction results and various tribofilm nano properties was found, which is discussed in this work.
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