Kretschmer, A., & Mayrhofer, P. H. (2025). High-temperature oxidation resistance of sputtered (Al,Cr,Nb,Ta,Ti,Si)N coatings. Journal of Alloys and Compounds, 1010, Article 176912. https://doi.org/10.1016/j.jallcom.2024.176912
A ceramic; A sputtered films; B SEM; B TEM; B XRD; C oxidation
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Abstract:
High-entropy metal-sublattice (Al,Cr,Nb,Ta,Ti)N coatings, with up to 15.0 at% additional Si content were developed and investigated for their oxidation resistance by exposing them for 3, 30, and 100 h to ambient air at 900, 950, and 1000 ∘C. The Si-free coating is rapidly oxidized, but all of the Si-alloyed coatings survive even the harshest oxidation test. The oxides crystallize mostly in the rutile structure with some Ta₂O₅-type phase fractions at higher Si contents. Detailed TEM investigations reveal a varied microstructure across the oxide scales with a succession of Cr-, Al, and Ti-rich top oxide layers, which agrees with a reported thermodynamical calculation of oxide stabilities.
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Research facilities:
Röntgenzentrum Universitäre Service-Einrichtung für Transmissionselektronenmikroskopie
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Project title:
2201220502-FV02 - P2.2: WP05: Tribological behaviour of High Entropy Nitride Coatings "HENiCoat" SWP02: DFT and Data Science guided multielement-alloy discovery: FFG 872176 - 201220502-FV02 (FFG - Österr. Forschungsförderungs- gesellschaft mbH)
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Research Areas:
Surfaces and Interfaces: 20% Structure-Property Relationsship: 80%
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