Solid nanocrystalline fullerite-containing carbon coatings |
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Authors: | K V Oskomov N S Sochugov A A Solov’ev S V Rabotkin |
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Affiliation: | (1) Nanotribology Laboratory for Information Storage and MEMS/NEMS, The Ohio State University, W 390 Scott Laboratory, 201 W. 19th Avenue, 43210-1142 Columbus, OH, USA |
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Abstract: | Solid carbon coatings with a high content of nanocrystalline fullerite have been obtained using unbalanced magnetron sputtering
of graphite under conditions of pulsed high-voltage ion bombardment of the film growing on a substrate. It is established
that samples possessing the maximum hardness (18.8 GPa) are characterized by maximum values of the volume fraction of fullerite
in the coating (50%), coherent scattering domain size (53 nm), degree of preferred grain orientation (85%), relative deformation
of the lattice (1.02%), and internal compressive stresses (2.91 GPa). The observed behavior is consistent with the mechanism
of strengthening that accounts for the phenomenon of superhardness in nanocrystalline and nanocomposite materials. This assumption
is confirmed by the results of investigation of the morphology of growing coatings. |
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