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Tribological characterization of tungsten nitride coatings deposited by reactive magnetron sputtering

Polcar, T., Parreira, N.M.G. and Cavaleiro, A. (2007) Tribological characterization of tungsten nitride coatings deposited by reactive magnetron sputtering Wear, 262, (5-6), pp. 655-665. (doi:10.1016/j.wear.2006.07.010).

Record type: Article


The structure, hardness, friction and wear of tungsten nitrides prepared by d.c. reactive magnetron sputtering were investigated. The coatings were deposited with different nitrogen to argon ratios; the total pressure was kept constant. The tribological tests were performed on a pin-on-disc tribometer in terrestrial atmosphere with 100Cr6 steel, Al2O3 and Si3N4 balls as sliding counter-bodies. The wear tracks, the ball-wear scars and the wear debris were analysed by scanning electron microscopy in order to characterize the dominant wear mechanisms.

The coatings exhibited different phases as a function of the nitrogen content: films with low N content exhibited the ?-W phase; ?-W phase was dominant for nitrogen contents from 12 to 15 at.% and ?-W2N was observed for nitrogen content higher that 30 at.%. The mechanical and tribological properties of the tungsten nitride coatings were strongly influenced by the structure. The hardness and the Young's modulus values were in the ranges (29–39 GPa) and (300–390 GPa), respectively; the lowest values correspond to the coatings with the highest nitrogen content. Generally, the friction and wear rate of tungsten nitride coatings sliding against ceramic balls increased with nitrogen content reaching a maximum at 12 at.%; further increase of the nitrogen content led to a decrease of the friction and wear. The sliding with the steel balls did not wear the coatings under the selected testing conditions

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e-pub ahead of print date: 23 August 2006
Published date: 28 February 2007
Keywords: unlubricated friction, friction mechanisms, nitrides, tungsten, coatings, wear-resistant
Organisations: nCATS Group


Local EPrints ID: 199757
ISSN: 0043-1648
PURE UUID: e205759a-ea65-4f01-912b-b738472a5a84
ORCID for T. Polcar: ORCID iD

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Date deposited: 20 Oct 2011 10:09
Last modified: 18 Jul 2017 11:15

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Author: T. Polcar ORCID iD
Author: N.M.G. Parreira
Author: A. Cavaleiro

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