Temperature dependence of metastable alumina formation during thermal oxidation of FeCrAl foils

✍ Scribed by G. Berthomé; E. N'Dah; Y. Wouters; A. Galerie

• Publisher: John Wiley and Sons
• Year: 2005
• Tongue: German
• Weight: 178 KB
• Volume: 56
• Category: Article
• ISSN: 0947-5117
• DOI: 10.1002/maco.200403851

✦ Synopsis

Industrial FeCrAl foils were isothermally oxidized during 5 hours between 850 and 1000 8C in atmosphere of pure oxygen. Characterization of transition and a-alumina phases was performed by XRD and XPS, using reference spectra obtained by various air annealing treatments of pure c-Al 2 O 3 . An original model was proposed to deconvolute XPS spectra to obtain quantification of tran-sition alumina formation and transformation. At 850 8C, oxide scales on FeCrAl consisted of transition alumina, whereas higher temperature treatments resulted in decreased amounts of transition aluminas and in increasing a-alumina formation. At 1000 8C, the highest temperature studied, the scale could be described by XPS and XRD as pure alpha.