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Ultra-hard amorphous AlMgB14 films RF sputtered onto curved substrates
KTH, School of Information and Communication Technology (ICT), Electronics. Petrozavodsk State University, Russian Federation; NMATECH Intelligent Materials Technology, Sweden.ORCID iD: 0000-0002-4997-9032
2017 (English)In: MATERIALS RESEARCH EXPRESS, ISSN 2053-1591, Vol. 4, no 3, 036406Article in journal (Refereed) Published
Abstract [en]

Recently, hard AlMgB14 (BAM) coatings were deposited for the first time by RF magnetron sputtering using a single stoichiometric ceramic target. High target sputtering power and sufficiently short target-to-substrate distance were found to be critical processing conditions. They enabled fabrication of stoichiometric in-depth compositionally homogeneous films with the peak values of nanohardness 88 GPa and Young's modulus 517 GPa at the penetration depth of 26 nm and, respectively, 35 GPa and 275 GPa at 200 nm depth in 2 mu m thick film (Grishin et al 2014 JETP Lett. 100 680). The narrow range of sufficiently short target-to-substrate distance makes impossible to coat non flat specimens. To achieve ultimate BAM films' characteristics onto curved surfaces we developed two-step sputtering process. The first thin layer is deposited as a template at low RF power that facilitates a layered Frank van der Merwe mode growth of smooth film occurs. The next layer is grown at high RF target sputtering power. The affinity of subsequent flow of sputtered atoms to already evenly condensed template fosters the development of smooth film surface. As an example, we made BAM coating onto hemispherical 5 mm in diameter ball made from a hard tool steel and used as a head of a special gauge. Very smooth (6.6 nm RMS surface roughness) and hard AlMgB14 films fabricated onto commercial ball-shaped items enhance hardness of tool steel specimens by a factor of four.

Place, publisher, year, edition, pages
Institute of Physics (IOP), 2017. Vol. 4, no 3, 036406
Keyword [en]
conformal coating, surface roughness, nanohardness, elastic modulus
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-206305DOI: 10.1088/2053-1591/aa6460ISI: 000398934700001ScopusID: 2-s2.0-85016815611OAI: oai:DiVA.org:kth-206305DiVA: diva2:1093378
Note

QC 20170505

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

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CiteExportLink to record
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Citation style
  • apa
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