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Title

Phase composition and tribomechanical properties of Ti–B–C nanocomposite coatings prepared by magnetron sputtering

AuthorsSánchez-López, J.C. ; Abad, Manuel D. ; Justo, Ángel ; Gago, Raúl ; Endrino, José Luis ; García-Luis, Alberto; Brizuela, Marta
Issue Date2012
PublisherInstitute of Physics Publishing
CitationJournal of Physics D. Applied physics, 45(37): 375401 (2012)
AbstractProtective nanocomposite coatings based on hard ceramic phases (TiC, TiB2) combined with amorphous carbon (a-C) are of interest because of their adequate balance between mechanical and tribological performances. In this work, Ti–B–C nanocomposite coatings were prepared by co-sputtering of graphite and TiB2 targets. Varying the discharge power ratio applied to the graphite and TiB2 targets from 0 to 2, the a-C content in the coatings could be tuned from 0 to 60%, as observed by means of Raman and x-ray photoelectron spectroscopy (XPS). The microstructural characterization demonstrated a progressive decrease in crystallinity from an initial nanocrystalline (nc) TiB2-like structure to a distorted TiBxCy ternary compound with increasing C concentration. X-ray absorption near-edge structure measurements on the B K-edge helped to determine a hexagonal arrangement around the B atoms in the ternary TiBxCy phase. A fitting analysis of the C 1s XPS peak allowed us to evaluate the relative amount of a-C and TiBxCy components. A drastic change in hardness (from 52 to 13 GPa) and friction coefficient values (from 0.8 to 0.2) is noticed when moving from nc-TiB2 to TiBC/a-C nanocomposites. The fraction of a-C necessary to decrease the friction below 0.2 was found to be 45%. Raman observation of the wear tracks determined the presence of disordered sp2-bonded carbon phase associated with the diminution of the friction level.
Publisher version (URL)http://dx.doi.org/10.1088/0022-3727/45/37/375401
URIhttp://hdl.handle.net/10261/113352
DOI10.1088/0022-3727/45/37/375401
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