Artículo
Phase composition and tribomechanical properties of Ti–B–C nanocomposite coatings prepared by magnetron sputtering
Autor/es | Brizuela, Marta
García Luis, Alberto Endrino, José Luis Gago, Raúl Justo Erbez, Ángel J. Abad Roldán, Manuel David Sánchez López, Juan Carlos |
Fecha de publicación | 2012 |
Fecha de depósito | 2018-04-13 |
Publicado en |
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Resumen | Protective 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 ... Protective 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. |
Agencias financiadoras | Ministerio de Educación y Ciencia (MEC). España |
Identificador del proyecto | CSD2008-00023
AT2007-66881-C02-01/-02 MAT2011-29074-C02- 01/-02 FIS2009-12964-C05-04 |
Cita | Brizuela, M., García Luis, A., Endrino, J.L., Gago, R., Justo Erbez, Á.J., Abad Roldán, M.D. y Sánchez López, J.C. (2012). Phase composition and tribomechanical properties of Ti–B–C nanocomposite coatings prepared by magnetron sputtering. Journal of Physics D. Applied physics, 45 (37), 1-26. |
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