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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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Kolozsvári, S.
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Publications (3/3 displayed)
- 2023High-temperature oxidation resistance of ternary and quaternary Cr-(Mo)-Si-B<sub>2-z</sub> coatings — Influence of Mo additioncitations
- 2023Role of Si segregation in the structural, mechanical, and compositional evolution of high-temperature oxidation resistant Cr-Si-B<sub>2±z</sub> thin filmscitations
- 2020Correlation between fracture characteristics and valence electron concentration of sputtered Hf-C-N based thin filmscitations
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article
Correlation between fracture characteristics and valence electron concentration of sputtered Hf-C-N based thin films
Abstract
<p>Hard protective coating materials based on transition metal nitrides and carbides typically suffer from limited fracture tolerance. To further tune these properties non-metal alloying – substituting C with N – has been proven favorable for magnetron sputtered Hf-C-N based thin films. A theoretically predicted increase in valence electron concentration (from 8.0 to 9.0 e/f.u. from Hf[sbnd]C to Hf[sbnd]N) through nitrogen alloying lead to an increase in fracture toughness (K<sub>IC</sub> obtained during in-situ SEM cantilever bending) from 1.89 ± 0.15 to 2.33 ± 0.18 MPa·m<sup>1/2</sup> for Hf<sub>0.43</sub>C<sub>0.57</sub> to Hf<sub>0.35</sub>C<sub>0.30</sub>N<sub>0.35</sub>, respectively. The hardness remains close to the super-hard regime with values of 37.8 ± 2.1 to 39.9 ± 2.7 GPa for these specific compositions. Already the addition of small amounts of nitrogen, while sputtering a ceramic Hf[sbnd]C target, leads to a drastic increase of nitrogen on the non-metallic sublattice for fcc single phased structured HfC<sub>1-x</sub>N<sub>x</sub> films, where x = N/(C + N). The here obtained results also provide experimental proof for the correlation between fracture characteristics and valence electron concentration.</p>