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Effect of Water Vapor on the Oxidation Behavior of the Eutectic High‐Temperature Alloy Mo‐20Si‐52.8Ti [in press]

Weber, Matthias; Gorr, Bronislava; Christ, Hans-Jürgen; Obert, Susanne; Kauffmann, Alexander; Heilmaier, Martin

Abstract:
Herein, the effect of water vapor on the oxidation resistance of the alloy Mo-20Si-52.8Ti (at%) is investigated. The alloy is oxidized in dry, wet, as well as in in situ changing atmospheres at 1100 C. The oxidation kinetics changes from nearly parabolic to linear if water vapor is present in oxidizing atmosphere. Under all conditions, the oxide scales consist of an outer TiO$^{2}$ and a TiO$^{2}$─SiO$^{2}$ duplex layer underneath. In wet atmosphere, the thicknesses of the two regions substantially increase indicating a severe ingress of water vapor. The inferior oxidation resistance in wet environment is primarily rationalized by the fast diffusion of H$^{2}$O through SiO$^{2}$.

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Verlagsausgabe §
DOI: 10.5445/IR/1000118814
Veröffentlicht am 03.06.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Werkstoffkunde (IAM-WK)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 1438-1656, 1527-2648
KITopen-ID: 1000118814
HGF-Programm 34.13.02 (POF III, LK 01)
Portfolio Material zukünftige Energief.
Erschienen in Advanced engineering materials
Seiten adem.202000219
Vorab online veröffentlicht am 29.04.2020
Nachgewiesen in Web of Science
Scopus
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