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Morphology and microstructure evolution of Ti-50 at.% Al cathodes during cathodic arc deposition of Ti-Al-N coatings
Linköping University, Department of Physics, Chemistry and Biology, Nanostructured Materials. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Physics, Chemistry and Biology, Nanostructured Materials. Linköping University, Faculty of Science & Engineering. (IFM)
PLANSEE Composite Materials GmbH, Germany.
PLANSEE Composite Materials GmbH, Germany.
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2017 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 121, no 24, article id 245309 (2017)Article in journal (Refereed) Published
Abstract [en]

Today's research on the cathodic arc deposition technique and coatings therefrom primarily focuses on the effects of, e.g., nitrogen partial pressure, growth temperature, and substrate bias. Detailed studies on the morphology and structure of the starting material—the cathode—during film growth and its influence on coating properties at different process conditions are rare. This work aims to study the evolution of the converted layer, its morphology, and microstructure, as a function of the cathode material grain size during deposition of Ti-Al-N coatings. The coatings were reactively grown in pure N2discharges from powder metallurgically manufactured Ti-50 at.% Al cathodes with grain size distribution averages close to 1800, 100, 50, and 10 μm, respectively, and characterized with respect to microstructure, composition, and mechanical properties. The results indicate that for the cathode of 1800 μm grain size the disparity in the work function among parent phases plays a dominant role in the pronounced erosion of Al, which yields the coatings rich in macro-particles and of high Al content. We further observed that a reduction in the grain size of Ti-50 at.% Al cathodes to 10 μm provides favorable conditions for self-sustaining reactions between Ti and Al phases upon arcing to form γ phase. The combination of self-sustaining reaction and the arc process not only result in the formation of hole-like and sub-hole features on the converted layer but also generate coatings of high Al content and laden with macro-particles.

Place, publisher, year, edition, pages
Melville, New York 11747-4300: American Institute of Physics (AIP), 2017. Vol. 121, no 24, article id 245309 (2017)
Keywords [en]
cathodic arc, Ti-Al-N, metallurgy, work function, cohesive energy, coatings, microsturcture, Ti-50 at.% Al
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:liu:diva-139116DOI: 10.1063/1.4990425ISI: 000430928300011Scopus ID: 2-s2.0-85021732715OAI: oai:DiVA.org:liu-139116DiVA, id: diva2:1118771
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VINNOVAAvailable from: 2017-07-02 Created: 2017-07-02 Last updated: 2018-05-23Bibliographically approved

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