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Synthesis and Properties of Orthorhombic MoAlB Coatings
Rhein Westfal TH Aachen, Mat Chem, Kopernikusstr 10, D-52074 Aachen, Germany.
Max Planck Inst Eisenforsch GmbH, Max Planck Str 1, D-40237 Dusseldorf, Germany.
Rhein Westfal TH Aachen, Mat Chem, Kopernikusstr 10, D-52074 Aachen, Germany;Max Planck Inst Eisenforsch GmbH, Max Planck Str 1, D-40237 Dusseldorf, Germany.
Rhein Westfal TH Aachen, Mat Chem, Kopernikusstr 10, D-52074 Aachen, Germany.
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2019 (English)In: Coatings, ISSN 2079-6412, Vol. 9, no 8, article id 510Article in journal (Refereed) Published
Abstract [en]

MoAlB is a potential candidate for high-temperature application since a dense, adherent alumina scale is formed. While, based on X-ray diffraction investigations, the formation of phase pure orthorhombic MoAlB coatings is observed, energy dispersive X-ray spectroscopy carried out in a scanning transmission electron microscope reveals the presence of Al-rich and O-rich regions within the MoAlB matrix. The oxidation kinetics of coatings and bulk is similar to the scale thickness formed on the MoAlB coating after oxidation at 1200 degrees C for 30 min is similar to the one extrapolated for bulk MoAlB. Furthermore, the oxidation kinetics of MoAlB coatings is significantly lower than the one reported for bulk Ti2AlC. Finally, the elastic properties measured for the as-deposited coatings are consistent ab initio predictions.

Place, publisher, year, edition, pages
MDPI , 2019. Vol. 9, no 8, article id 510
Keywords [en]
MoAlB, coatings, physical vapor deposition (PVD), density functional theory (DFT), high-resolution transmission electron microscopy
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-393898DOI: 10.3390/coatings9080510ISI: 000482996800050OAI: oai:DiVA.org:uu-393898DiVA, id: diva2:1362359
Funder
Swedish Research Council, 821-2012-5144Swedish Foundation for Strategic Research , RIF14-0053Available from: 2019-10-18 Created: 2019-10-18 Last updated: 2019-10-18Bibliographically approved

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