Abstracts Book - IMRC 2018

• SA1-O037
MECHANICAL AND TRIBOLOGICAL PROPERTIES OF THE WC-W-a:C
MULTILAYER AND COMPOSITE THIN FILM
Cesar Rivera Tellao 1,2 , Dulce Melo Máximo 1 , Ramiro Meza Corona 3 , Joaquin Oseguera 1 , Lizbeth
Melo Máximo 4
1
Trames S. A. de C. V., , Mexico. 2 Universidad de Guadalajara, , Mexico. 3 TERMOINNOVA,
Tecnologia, Mexico. 4 Trames S. A. de C. V., Mecánica, Mexico.
Recently, there has been a growing interest for the development of novel thin
films or coatings with the incorporation of composites or nanocomposites inside
of a carbon matrix, since several investigations have reported a significant
reduction of the friction coefficient with the incorporation of carbon or carbon
compound inside of different coatings. In this investigation four different WC-W-
Cr-a:C coatings deposited by reactive magnetron sputtering on steel 4140 and
Si have been analyzed to their morphological (scanning electronic microscopy),
structural, mechanical and tribological properties. We focus the study on the
advantages and disadvantages in the use of reactive gases (CH4) for the
formation of a: C matrix with a multilayer and composites configuration of WC-
W for tribological low Hertzian contact applications. Our results revealed the
presence of W2C and non-stoichiometric WC1-x phases. Furthermore, the
hierarchical multilayer configuration obtained the highest hardness values (6.5
GPa) and a reduction of the wear rate in comparison to the standard multilayer
configuration. On the other hand the thin films with a composite configuration
showed lower friction coefficient values in comparison to the multilayer
configuration. The bonding energy between the W and C atoms acquired during
the deposition process and the type of configuration (composite or multilayer),
played an important role on the morphological, structural, mechanical and
tribological properties.
Keywords: Multilayer, Composite, Reactive Magnetron Sputtering
Presenting authors email: joseguer@itesm.mx