Oxidation resistance of cathodic arc evaporated Cr$_{0.74}$Ta$_{0.26}$N coatings

Autor: Christina Kainz, Christian Saringer, Michael Burtscher, Michael Tkadletz, Andreas Stark, Norbert Schell, Markus Pohler, Christoph Czettl, Daniel Kiener, Nina Schalk
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: Kainz, C.; Saringer, C.; Burtscher, M.; Tkadletz, M.; Stark, A.; Schell, N.; Pohler, M.; Czettl, C.; Kiener, D.; Schalk, N. : Oxidation resistance of cathodic arc evaporated Cr0.74Ta0.26N coatings. In: Scripta Materialia. Vol. 211 (2022) 114492. (DOI: /10.1016/j.scriptamat.2021.114492)
Scripta materialia 211, 114492 (2022). doi:10.1016/j.scriptamat.2021.114492
ISSN: 1359-6462
DOI: 10.3204/pubdb-2022-01053
Popis: Scripta materialia 211, 114492 (2022). doi:10.1016/j.scriptamat.2021.114492
Owing to their combination of high hardness and increased fracture toughness, CrTaN coatings have re- cently 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 thor- oughly understood. Thus within this work, the evolution of microstructure and phase composition of a cathodic arc evaporated Cr$_{0.74}$Ta$_{0.26}$N 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 rhom- bohedral (r) Cr$_2$O$_3$ 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$_2$O$_3$ and t-CrTaO$_4$ and a dense r-Cr$_2$O$_3$ oxide scale at the surface.
Published by Elsevier Science, Amsterdam [u.a.]
Databáze: OpenAIRE
Externí odkaz: