Chemical and mechanical stability of air annealed cathodic arc evaporated CrAlON coatings
Almandoz, Eluxka and Fuentes, Gonzalo G. and Fernández, José and Martinez de Bujanda, Javier and Rodríguez, Rafael J. and Pérez-Trujillo, Fco. Javier and Alcalá, Germán and Lousa, Arturo and Qin, Yi (2018) Chemical and mechanical stability of air annealed cathodic arc evaporated CrAlON coatings. Surface and Coatings Technology, 351. pp. 153-161. ISSN 0257-8972 (https://doi.org/10.1016/j.surfcoat.2018.07.081)
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Abstract
This study reports the synthesis and characterization of ternary Cr-Al-O and quaternary Cr-Al-O-N coatings deposited by cathodic arc physical vapour deposition, for various nitrogen and oxygen mass flow ratios during the growth process. The composition, microstructure, indentation hardness and modulus of the films have been characterized by scanning electron microscopy, electron probe micro-analysis, X-ray diffraction, and nanoindentation techniques. The evolution of the microstructure and mechanical properties of the coatings after ambient air annealing from 800 °C up to 1100 °C have been investigated. As the oxygen to nitrogen mass flow increases, the as-deposited coatings exhibit lower hardness, higher roughness, lower crystallinity and a more marked columnar structure. At oxygen to nitrogen mass flow ratios bigger than 10/90, the coatings exhibit a stoichiometry of the type (CrAl)2+εO3−ε. Only the coatings with an oxygen to nitrogen mass flow ratio smaller than 10/90 retained nitrogen in their compositions. In all cases, the coatings developed a cubic fcc lattice structure. After annealing at 1100 °C the resulting microstructure showed a clear dependency upon the initial composition of the films. The evolution of the microstructure during the high temperature tests, as well as the analysis of the nanoindentation hardness, composition and thickness also provided valuable information about the combined effects of the thermal stability and the oxidation of the deposited coatings.
ORCID iDs
Almandoz, Eluxka, Fuentes, Gonzalo G., Fernández, José, Martinez de Bujanda, Javier, Rodríguez, Rafael J., Pérez-Trujillo, Fco. Javier, Alcalá, Germán, Lousa, Arturo and Qin, Yi ORCID: https://orcid.org/0000-0001-7103-4855;-
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Item type: Article ID code: 65358 Dates: DateEvent15 October 2018Published29 July 2018Published Online28 July 2018AcceptedSubjects: Technology > Engineering (General). Civil engineering (General) Department: Faculty of Engineering > Design, Manufacture and Engineering Management Depositing user: Pure Administrator Date deposited: 05 Sep 2018 10:29 Last modified: 04 Sep 2024 00:59 Related URLs: URI: https://strathprints.strath.ac.uk/id/eprint/65358