Oxidation resistance of cathodic arc evaporated Cr0.74Ta0.26N coatings
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In: Scripta materialia, Vol. 211.2022, No. 1 April, 114492, 01.04.2022.
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TY - JOUR
T1 - Oxidation resistance of cathodic arc evaporated Cr0.74Ta0.26N coatings
AU - Kainz, Christina
AU - Saringer, Christian
AU - Burtscher, Michael
AU - Tkadletz, Michael
AU - Stark, Andreas
AU - Schell, Norbert
AU - Pohler, Markus
AU - Czettl, Christoph
AU - Kiener, Daniel
AU - Schalk, Nina
N1 - Publisher Copyright: © 2021 The Author(s)
PY - 2022/4/1
Y1 - 2022/4/1
N2 - Owing to their combination of high hardness and increased fracture toughness, CrTaN coatings have recently gained increasing interest as suitable candidates for metal cutting applications. However, up to now, the detailed mechanisms underlying the oxidation of this promising coating system are not thoroughly understood. Thus within this work, the evolution of microstructure and phase composition of a cathodic arc evaporated Cr 0.74Ta 0.26N coating were illuminated in ambient atmosphere up to 1400 °C. In situ high-energy X-ray diffraction showed that powdered face-centered cubic (fcc) CrTaN displays an excellent oxidation resistance up to ∼1050 °C, where the formation of tetragonal (t) CrTaO 4 and rhombohedral (r) Cr 2O 3 sets in. The compact CrTaN deposited on sapphire subjected to 1225 °C in ambient atmosphere exhibits intact fcc-CrTaN regions near the substrate, a porous intermediate layer of r-Cr 2O 3 and t-CrTaO 4 and a dense r-Cr 2O 3 oxide scale at the surface.
AB - Owing to their combination of high hardness and increased fracture toughness, CrTaN coatings have recently gained increasing interest as suitable candidates for metal cutting applications. However, up to now, the detailed mechanisms underlying the oxidation of this promising coating system are not thoroughly understood. Thus within this work, the evolution of microstructure and phase composition of a cathodic arc evaporated Cr 0.74Ta 0.26N coating were illuminated in ambient atmosphere up to 1400 °C. In situ high-energy X-ray diffraction showed that powdered face-centered cubic (fcc) CrTaN displays an excellent oxidation resistance up to ∼1050 °C, where the formation of tetragonal (t) CrTaO 4 and rhombohedral (r) Cr 2O 3 sets in. The compact CrTaN deposited on sapphire subjected to 1225 °C in ambient atmosphere exhibits intact fcc-CrTaN regions near the substrate, a porous intermediate layer of r-Cr 2O 3 and t-CrTaO 4 and a dense r-Cr 2O 3 oxide scale at the surface.
UR - http://www.scopus.com/inward/record.url?scp=85122515182&partnerID=8YFLogxK
U2 - 10.1016/j.scriptamat.2021.114492
DO - 10.1016/j.scriptamat.2021.114492
M3 - Article
VL - 211.2022
JO - Scripta materialia
JF - Scripta materialia
SN - 1359-6462
IS - 1 April
M1 - 114492
ER -