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Superhard NbB2-x th...
Superhard NbB2-x thin films deposited by dc magnetron sputtering
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- Nedfors, Nils (författare)
- Uppsala universitet,Oorganisk kemi,Institutionen för kemi - Ångström,Uppsala University, Sweden
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- Tengstrand, Olof (författare)
- Linköpings universitet,Tunnfilmsfysik,Tekniska högskolan
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- Lu, Jun (författare)
- Linköpings universitet,Tunnfilmsfysik,Tekniska högskolan
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- Persson, Per O A (författare)
- Linköpings universitet,Tunnfilmsfysik,Tekniska högskolan
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- Eklund, Per (författare)
- Linköpings universitet,Tunnfilmsfysik,Tekniska högskolan
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- Hultman, Lars (författare)
- Linköpings universitet,Tunnfilmsfysik,Tekniska högskolan
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- Jansson, Ulf (författare)
- Uppsala universitet,Oorganisk kemi,Uppsala University, Sweden
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(creator_code:org_t)
- Elsevier BV, 2014
- 2014
- Engelska.
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Ingår i: Surface & Coatings Technology. - : Elsevier BV. - 0257-8972 .- 1879-3347. ; 257, s. 295-300
- Relaterad länk:
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https://doi.org/10.1...
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https://uu.diva-port... (primary) (Raw object)
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- We have deposited weakly textured substoichiometric NbB2-x thin films by magnetron sputtering from a NbB2 target. The films exhibit superhardness (42 ± 4 GPa), previously only observed in overstoichiometric TiB2 thin films, and explained by a self-organized nanostructuring, where thin TiB2 columnar grains hinder nucleation and slip of dislocations and a B-rich tissue phase between the grains prevent grain-boundary sliding. The wide homogeneity range for the NbB2 phase allows a similar ultra-thin B-rich tissue phase to form between thin (5 – 10 nm) columnar NbB2-x grains also for films with a B/Nb atomic ratio of 1.8, as revealed here by analytical aberration-corrected scanning transmission electron microscopy. Furthermore, a coefficient of friction of 0.16 is measured for a NbB2-x film sliding against stainless steel with a wear rate of 4x10-7 mm3/Nm. X-ray photoelectron spectroscopy results suggest that the low friction is due to the formation of a lubricating boric acid film.
Ämnesord
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Nyckelord
- boride
- structure characterization
- mechanical properties
- friction
- tribological properties
- Chemistry with specialization in Materials Chemistry
- Kemi med inriktning mot materialkemi
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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