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Superhard NbB2 −x thin films deposited by dc magnetron sputtering
Uppsala University, Sweden.
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, The Institute of Technology.ORCID iD: 0000-0003-1785-0864
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2014 (English)In: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 257, 295-300 p.Article in journal (Refereed) Published
Abstract [en]

We have deposited weakly textured substoichiometric NbB2-x thin films by magnetron sputtering from an 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 an NbB2-x film sliding against stainless steel with a wear rate of 5 x 10(-7) mm(3)/Nm. X-ray photoelectron spectroscopy results suggest that the low friction is due to the formation of a lubricating boric acid film.

Place, publisher, year, edition, pages
Elsevier, 2014. Vol. 257, 295-300 p.
Keyword [en]
Boride; Magnetron sputtering; Structure characterization; Mechanical properties; Friction; Tribological properties
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:liu:diva-112641DOI: 10.1016/j.surfcoat.2014.07.087ISI: 000344423100029OAI: oai:DiVA.org:liu-112641DiVA: diva2:769091
Note

Funding Agencies|Vinnova (Swedish Governmental Agency for Innovation Systems) through the VINN Excellence Centre FunMat; Swedish Foundation of Strategic Research through the Synergy Grant FUNCASE; Knut and Alice Wallenberg Foundation

Available from: 2014-12-05 Created: 2014-12-05 Last updated: 2017-12-05Bibliographically approved

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Tengstrand, OlofLu, JunEklund, PerPersson, Per O AHultman, Lars

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