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Recently, we have reported on low friction CrN/TiN coatings deposited using ahybrid sputtering technique. These multilayers exhibit friction coefficients$\mu$ below 0.1 when tested in atmosphere with a relative humidity$\approx25%$, but $\mu$ ranges between 0.6-0.8 upon decreasing the humiditybelow 5%. Here we use first principle calculations to study O and H adatomenergetics on TiN and CrN (001) surfaces. The diffusional barrier of H onTiN(001) is about half of the value on CrN(001) surface, while both elementsare stronger bonded on CrN. Based on these results we propose a mechanism for awater-based self-assembled nanobearing.

First principles study of water-based self-assembled nanobearing effect in CrN/TiN multilayer coatings