Synthesis and Properties of Orthorhombic MoAlB Coatings
1
Materials Chemistry, RWTH Aachen University, Kopernikusstr. 10, 52074 Aachen, Germany
2
Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Str. 1, 40237 Düsseldorf, Germany
3
Department of Physics and Astronomy, Uppsala University, Lägerhyddsvägen 1, 75120 Uppsala, Sweden
*
Author to whom correspondence should be addressed.
Coatings 2019, 9(8), 510; https://doi.org/10.3390/coatings9080510
Received: 24 July 2019
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Revised: 1 August 2019
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Accepted: 9 August 2019
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Published: 12 August 2019
(This article belongs to the Special Issue Magnetron Sputtering Deposited Thin Films and Its Applications)
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 °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.
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Keywords:
MoAlB; coatings; physical vapor deposition (PVD); density functional theory (DFT); high-resolution transmission electron microscopy
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MDPI and ACS Style
Achenbach, J.-O.; Sahu, R.; Völker, B.; Hans, M.; Primetzhofer, D.; Miljanovic, D.J.; Scheu, C.; Schneider, J.M. Synthesis and Properties of Orthorhombic MoAlB Coatings. Coatings 2019, 9, 510. https://doi.org/10.3390/coatings9080510
AMA Style
Achenbach J-O, Sahu R, Völker B, Hans M, Primetzhofer D, Miljanovic DJ, Scheu C, Schneider JM. Synthesis and Properties of Orthorhombic MoAlB Coatings. Coatings. 2019; 9(8):510. https://doi.org/10.3390/coatings9080510
Chicago/Turabian StyleAchenbach, Jan-Ole, Rajib Sahu, Bernhard Völker, Marcus Hans, Daniel Primetzhofer, Danilo J. Miljanovic, Christina Scheu, and Jochen M. Schneider. 2019. "Synthesis and Properties of Orthorhombic MoAlB Coatings" Coatings 9, no. 8: 510. https://doi.org/10.3390/coatings9080510
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