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Oxidation behavior of a Mo (Si, Al)(2)-based composite at 300-1000 degrees C
Dalarna University, School of Technology and Business Studies, Material Science.
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2010 (English)In: Intermetallics (Barking), ISSN 0966-9795, Vol. 18, no 4, 633-640 p.Article in journal (Refereed) Published
Abstract [en]

The oxidation behavior of a Mo (Si,Al)(2)-based composite of Mo(Si,Al)(2), Al2O3 and Mo-5(Si,Al)(3) (Kanthal Super ER) in synthetic air was investigated. The samples were oxidized isothermally for up to 72 h at 300-1000 degrees C using a thermobalance. The microstructure was analyzed by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) and Auger Electron Spectroscopy (AES) depth profiling. Broad ion beam milling (BIB) was used to prepare cross-sections. Oxidation behavior depended strongly on the composition of the substrate which consisted of a Mo(Si,Al)(2) matrix and the minority phases Mo-5(Si,Al)(3) and Al2O3. At 300-500 degrees C the mass gains were small with parabolic kinetics, oxidation resulting in a mixture of oxides that reflects the substrate composition. At 600 and 700 degrees C the oxide scale is thin and protective and depleted in molybdenum, a mass loss occurring due to MoO3 vaporization. At 1000 degrees C a protective alpha-alumina scale forms. (C) 2009 Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
2010. Vol. 18, no 4, 633-640 p.
National Category
Materials Engineering
Research subject
Stålformning och ytteknik
Identifiers
URN: urn:nbn:se:du-10493DOI: 10.1016/j.intermet.2009.10.019ISI: 000276058200035OAI: oai:DiVA.org:du-10493DiVA: diva2:542780
Available from: 2012-08-03 Created: 2012-08-03 Last updated: 2015-09-14Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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  • vancouver
  • chicago-author-date
  • chicago-note-bibliography
  • Other style
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Language
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  • nn-NB
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