| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Baker, M. A.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (14/14 displayed)
- 2018The influence of SiO2 doping on the Ni/ZrO2 supported catalyst for hydrogen production through the glycerol steam reforming reactioncitations
- 2015The impact of substrate bias on a remote plasma sputter coating process for conformal coverage of trenches and 3D structurescitations
- 2009The nanostructure, wear and corrosion performance of arc-evaporated CrBxNy nanocomposite coatingscitations
- 2008Nanostructure, mechanical and tribological properties of reactive magnetron sputtered TiCx coatingscitations
- 2008Synthesis and characterization of Cr-B-N coatings deposited by reactive arc evaporationcitations
- 2007Hard and superhard TiAlBN coatings deposited by twin electron-beam evaporationcitations
- 2006Nanostructural studies of PVD TiAlB coatingscitations
- 2006Mechanical and tribological properties of CrTiCu(B,N) glassy-metal coatings deposited by reactive magnetron sputteringcitations
- 2005Investigation of the nanostructure and post-coat thermal treatment of wear-resistant PVD CrTiCuBN coatingscitations
- 2005Investigation of the nanostructure and wear properties of physical vapor deposited CrCuN nanocomposite coatingscitations
- 2005Characterisation and tribological evaluation of nitrogen-containing molybdenum-copper PVD metallic nanocomposite filmscitations
- 2003The nanostructure and mechanical properties of PVD CrCu (N) coatingscitations
- 2002Evaluating the microstructure and performance of nanocomposite PVD TiAlBN coatingscitations
- 2002Electron spectroscopic studies of nanocomposite PVD TiAlBN coatingscitations
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article
Characterisation and tribological evaluation of nitrogen-containing molybdenum-copper PVD metallic nanocomposite films
Abstract
This paper reports on the structural, mechanical and tribological properties of molybdenum-copper nanocomposite films 'doped' with small amounts of nitrogen, which contain either no nitride phase (i.e. the nitrogen is held in interstitial solid solution, mainly in molybdenum) or small amounts of lower nitrides (i.e. Mo2N). All films were deposited on Si wafers, AISI M2 high speed steel and AISI 316 stainless steel by reactive sputtering using a hot-filament-enhanced dc unbalanced magnetron system. A systematic approach was adopted to investigate the evolution of metal/metal and ceramic/metal phase combinations with increasing nitrogen content (up to ∼ 40 at.% N) in the film. Coating composition and microstructure were determined by cross-sectional TEM, SEM and XPS. XRD was used to identify (where possible) metallic and metal-nitride phases. Mechanical properties such as hardness and elastic modulus were determined by low load Knoop and instrumented Vickers indentation measurements. Reciprocating sliding, micro-abrasion and impact tests were performed to assess tribological performance. It was found that increasing the nitrogen gas flow rate from 0 to 15 sccm (and therefore nitrogen content in the film from 0 to 24 at.% N), refined significantly the coating microstructure from columnar to a dense and more equiaxed morphology, increasing the hardness whilst maintaining (almost constant) elastic modulus values, close to that of molybdenum metal. Further increases in the nitrogen gas flow rate resulted in films that appeared to contain significant fractions of the Mo2N ceramic phase. SEM and cross-sectional TEM analyses of the film deposited at a nitrogen flow rate of 20 sccm (containing ∼36 at.% N) demonstrated a microstructure consisting of 50-100 nm wide columns, which contain small regions of contrast in dark-field images, of the order of 3-5 nm wide. A maximum hardness of 32 GPa and the highest hardness/modulus ratio was however found in the (predominantly metallic) film deposited at a nitrogen gas flow rate of ...