4.6 Article

Tribological performance of Nb-C thin films prepared by DC and HiPIMS

Journal

MATERIALS LETTERS
Volume 277, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.matlet.2020.128334

Keywords

Physical vapour deposition; Sputtering; Nanocomposites; Thin films; Wear and tribology

Funding

  1. La Caixa Fundation
  2. Secretaria d'Universitats i Recerca (SUR) del Departament d'Empresa I Coneixement (DEC) de la Generalitat de Catalunya
  3. Fons Socials Europeus [2019FI_B01190]

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Nanostructured NbC thin films with variable contents of Nb and C were prepared by direct current (DC) magnetron sputtering, and for the first time, via high power impulse magnetron sputtering (HiPIMS) searching for an improvement in the tribological properties. X-ray diffraction shows that increasing the carbon incorporation, the crystalline composition evolves from Nb2C to NbC phase. Further carbon enrichment leads to a nanocomposite structure formed by small NbC crystals (8-14 nm) dispersed in a-C matrix. The friction coefficient varied from high friction (0.8) to low friction (0.25) and the hardness values between 20 and 11 GPa depending on the film composition. A densification of the coatings by changing the methodology from DC to HiPIMS was not observed. (C) 2020 Elsevier B.V. All rights reserved.

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