Title Phase composition and tribomechanical properties of Ti-B-C nanocomposite coatings prepared by magnetron sputtering
Authors Sánchez-López J.C. , Abad M.D. , Justo A. , Gago R. , ENDRINO ARMENTEROS, JOSÉ LUIS, García-Luis A. , Brizuela M.
External publication Si
Means J. Phys. D-Appl. Phys.
Scope Article
Nature Científica
JCR Quartile 1
SJR Quartile 1
JCR Impact 2.52800
SJR Impact 1.27900
Web https://www.scopus.com/inward/record.uri?eid=2-s2.0-84865959265&doi=10.1088%2f0022-3727%2f45%2f37%2f375401&partnerID=40&md5=90b124848d86613a9a7e324aa13a9909
Publication date 01/01/2012
ISI 000308798200013
Scopus Id 2-s2.0-84865959265
DOI 10.1088/0022-3727/45/37/375401
Abstract Protective nanocomposite coatings based on hard ceramic phases (TiC, TiB 2) combined with amorphous carbon (a-C) are of interest because of their adequate balance between mechanical and tribological performances. In this work, TiBC nanocomposite coatings were prepared by co-sputtering of graphite and TiB 2 targets. Varying the discharge power ratio applied to the graphite and TiB 2 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) TiB 2-like structure to a distorted TiB xC y 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 TiB xC y phase. A fitting analysis of the C 1s XPS peak allowed us to evaluate the relative amount of a-C and TiB xC y components. A drastic change in hardness (from 52 to 13GPa) and friction coefficient values (from 0.8 to 0.2) is noticed when moving from nc-TiB 2 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 sp 2-bonded carbon phase associated with the diminution of the friction level. © 2012 IOP Publishing Ltd.
Keywords Amorphous carbon (a-C); B atoms; Carbon phase; Ceramic phasis; Cosputtering; Crystallinities; Discharge power; Friction coefficients; Micro-structural characterization; Nano-composite coating; Nanocry
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