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Oxidation of Inconel 625 superalloy upon treatment with oxygen or hydrogen plasma at high temperature
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SYSNO ASEP 0487615 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Oxidation of Inconel 625 superalloy upon treatment with oxygen or hydrogen plasma at high temperature Tvůrce(i) Vesel, A. (SI)
Drenik, A. (SI)
Elersic, K. (SI)
Mozetič, M. (SI)
Kovač, J. (SI)
Gyergyek, T. (SI)
Stöckel, Jan (UFP-V) RID
Varju, Jozef (UFP-V) ORCID
Pánek, Radomír (UFP-V) RID
Balat-Pichelin, M. (FR)Zdroj.dok. Applied Surface Science. - : Elsevier - ISSN 0169-4332
Roč. 305, June (2014), s. 674-682Poč.str. 9 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. NL - Nizozemsko Klíč. slova Inconel ; Oxidation ; High temperature ; Oxygen plasma ; Hydrogen plasma Vědní obor RIV BL - Fyzika plazmatu a výboje v plynech Obor OECD Fluids and plasma physics (including surface physics) CEP LM2011021 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy Institucionální podpora UFP-V - RVO:61389021 UT WOS 000336525400094 EID SCOPUS 84899981387 DOI 10.1016/j.apsusc.2014.03.160 Anotace Initial stages of Inconel 625 superalloy (Ni60Cr30Mo10Ni4Nb1) oxidation upon short treatment with gaseous plasma at different temperatures up to about 1600 K were studied. Samples were treated for different periods up to a minute by oxygen or hydrogen plasma created with a microwave discharge in the standing-wave mode at a pressure of 40 Pa and a power 500W. Simultaneous heating of the samples was realized by focusing concentrated solar radiation from a 5 kW solar furnace directly onto the samples. The morphological changes upon treatment were monitored using scanning electron microscopy, compositional depth profiling was performed using Auger electron spectroscopy, while structural changes were determined by X-ray diffraction. The treatment in oxygen plasma caused formation of metal oxide clusters of three dimensional crystallites initially rich in nickel oxide with the increasing chromium oxide content as the temperature was increasing. At about 1100K iron and niobium oxides prevailed on the surface causing a drop of the material emissivity at 5 pm. Simultaneously the NiCr2O4 compound started growing at the interface between the oxide film and bulk alloy and the compound persisted up to temperatures close to the Inconel melting point. Intensive migration of minority alloying elements such as Fe and Ti was observed at 1600K forming mixed surface oxides of sub-micrometer dimensions. The treatment in hydrogen plasma with small admixture of water vapor did not cause much modification unless the temperature was close to the melting point. At such conditions aluminum segregated on the surface and formed well-defined Al2O3 crystals Pracoviště Ústav fyziky plazmatu Kontakt Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Rok sběru 2018
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