English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/13482
Compartir / Impacto:
Estadísticas
Add this article to your Mendeley library MendeleyBASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Título

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

AutorAbad, Manuel D. ; Cáceres, Daniel; Pogozhev, Yury S.; Shtansky, D.V.; Sánchez López, Juan Carlos
Palabras clavemagnetron sputtering
TiBC coatings
EELS
XPS
mechanical properties
Fecha de publicación2009
EditorJohn Wiley & Sons
CitaciónPlasma Processes and Polymers 2009
ResumenNanocomposite coatings combining hard phases (TiB2, TiC) with 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 amorphous carbon. 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 tribomechanical data are revised according to the phase composition and chemical bonding inside the nanocomposites.
Descripción17 pages
URIhttp://hdl.handle.net/10261/13482
ISSN1612-8850
Aparece en las colecciones: (ICMS) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
bonding.pdf278,15 kBAdobe PDFVista previa
Visualizar/Abrir
Mostrar el registro completo
 


NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.