Bonding structure and mechanical properties of Ti-B-C coatings

Manuel David Abad, Daniel Cáceres, Yury S. Pogozhev, Dmitry V. Shtansky, Juan Carlos Sánchez-López

Producció científica: Article en revista indexadaArticleAvaluat per experts

18 Cites (Scopus)


Nanocomposite coatings combining hard phases (TiB2, TiC) with an amorphous carbon (a-C) were developed to provide a good compromise between mechanical and tribological properties for M2 steels used in a wide variety of applications such as cutting tools, bearings and gear mechanisms. A combined d.c.-pulsed and r.f.-magnetron deposition process was used to deposit nanocomposite TiBC/a-C coatings with a variable content of carbon matrix phase. Chemical composition was determined by electron energy loss spectroscopy (EELS) and X-ray photoelectron spectroscopy (XPS). Transmission electron microscopy (TEM) revealed that the coatings microstructure is rather amorphous with small nanocrystals of TiC and/or TiB2 (not possible to differentiate by diffraction techniques). Investigation of the chemical bonding environment by XPS and EELS allows us to confirm the presence of titanium-boron and titanium-carbon bonds together with free a-C. Coatings exhibited hardness values (H) of 25-29 GPa, effective Young modulus (E*) of 310-350 GPa, H/E* ratios over 0.080 and resistance to plastic deformation (H3/ E*2) from 0.15 to 0.20. Tribological properties of the coatings were characterized by a pin-on-disk tribometer using steel and WC balls at high contact stresses (1.1 and 1.4 GPa respectively). Friction coefficients were reduced from 0.6 to 0.2 by increasing the content of free carbon without reduction of the hardness (around 28 GPa), by self-lubricant effects. The tribo-mechanical data are revised according to the phase composition and chemical bonding inside the nanocomposites.

Idioma originalAnglès
Pàgines (de-a)S107-S112
RevistaPlasma Processes and Polymers
NúmeroSUPPL. 1
Estat de la publicacióPublicada - 2009
Publicat externament


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