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Origin of Nickel Catalytic Particles in Carbon Nanotube Formation on a High-Carbon 25Cr–35Ni–Nb Cast Alloy
Université de Lyon, France; Total TRTG, France.
Université de Lyon, France.
Université de Lyon, France.
RISE - Research Institutes of Sweden, Materials and Production, KIMAB. Université de Lyon, France. (Institut de la Corrosion)
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2019 (English)In: Oxidation of Metals, ISSN 0030-770X, E-ISSN 1573-4889, Vol. 91, no 3-4, p. 279-290Article in journal (Refereed) Published
Abstract [en]

In this study, carbon nanotubes (CNTs) were formed on a high-carbon 25Cr35Ni–Nb cast alloy using a laboratory-scale experimental set-up that simulated favorable conditions for CNT growth in the presence of ethane and water vapor. After 45 min of exposure to the reactive atmosphere, the entire sample surface was covered with multiwalled nanotubes with an average diameter of approximately 50 nm, indicating the strong catalytic activity of the alloy surface. Transmission electron microscopy combined with energy-dispersive X-ray spectroscopy analyses revealed the presence of iron-containing Ni 3 C-based catalytic particles at the nanotubes tip. The origin of the nickel in the system was then investigated via cross-sectional observations and discussed. A mechanism similar to the so-called “ex-solution” process was proposed to explain the presence of catalytic particles, while their stability was attested by thermodynamic considerations. A scenario describing the different steps involved in the CNTs formation on the oxide scale is finally proposed.

Place, publisher, year, edition, pages
Springer New York LLC , 2019. Vol. 91, no 3-4, p. 279-290
Keywords [en]
25Cr35Ni cast alloy, Carbon nanotubes, Nickel carbides, Oxide scale, Thermo-calc, Binary alloys, Carbides, Catalyst activity, Chromium alloys, Energy dispersive spectroscopy, High resolution transmission electron microscopy, Nickel oxide, Niobium alloys, Scale (deposits), Transmission electron microscopy, Yarn, Cast alloys, Cross-sectional observations, Energy dispersive x-ray spectroscopy analysis, Favorable conditions, Multi-walled nanotubes, Nickel carbide, Thermocalc, Multiwalled carbon nanotubes (MWCN)
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Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-40461DOI: 10.1007/s11085-018-9880-3Scopus ID: 2-s2.0-85057011129OAI: oai:DiVA.org:ri-40461DiVA, id: diva2:1359938
Note

Funding details: Association Nationale de la Recherche et de la Technologie; Funding details: Association Nationale de la Recherche et de la Technologie, 2015/0205; Funding text 1: Acknowledgements This work was financially supported by the Association Nationale de la Recherche et de la Technologie (ANRT) through Project 2015/0205.

Available from: 2019-10-10 Created: 2019-10-10 Last updated: 2019-10-10Bibliographically approved

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