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

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

2012-02-15

arxiv.org/abs/1202.3234v2

Physics

Condensed Matter

Materials Science

4 pages, 3 figures

Scientific paper

Recently, we have reported on low friction CrN/TiN coatings deposited using a hybrid 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 humidity below 5%. Here we use first principle calculations to study O and H adatom energetics on TiN and CrN (001) surfaces. The diffusional barrier of H on TiN(001) is about half of the value on CrN(001) surface, while both elements are stronger bonded on CrN. Based on these results we propose a mechanism for a water-based self-assembled nanobearing.

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