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Oxidation of FeCrAl alloys at 500–900°C in dry O2

✍ Scribed by H. Josefsson; F. Liu; J.-E. Svensson; M. Halvarsson; L.-G. Johansson

Publisher
John Wiley and Sons
Year
2005
Tongue
German
Weight
293 KB
Volume
56
Category
Article
ISSN
0947-5117

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✦ Synopsis

This paper reports on the oxidation of a commercial FeCrAl alloy, Kanthal AF, in the temperature range 500 -900 8C. The samples are exposed isothermally in dry oxygen for up to 72 h using a thermo-balance. In addition, 168 h exposures are carried out in a tube furnace. The exposed samples are investigated by grazing angle Xray diffraction (XRD), scanning electron microscopy/energy dispersive X-ray analysis (SEM/EDX), and auger electron spectroscopy (AES).

The rate of oxidation increases with temperature, the kinetics being parabolic in the range 700 -900 8C. At all exposure temperatures, most of the sample surface is covered by a thin smooth base oxide. In addition, RE-rich particles, with a typical size of 1 -3 lm form. At 800 and 900 8C patches of thick oxide appear, featuring needle-formed crystallites situated on top of the base oxide. The thick oxide usually forms around Y-rich oxide particles. The concentration of iron and chromium in the oxide decreases with increasing temperature. XRD proves the formation of a-Al 2 O 3 already at 700 8C. The low temperature of formation of a-Al 2 O 3 is attributed to the presence of chromium in the initial oxide. It is proposed that corundum nucleation is facilitated on a surface consisting of the isostructural escolaite, (Cr 2 O 3 ). After exposure at 900 8C AES shows large amounts of Mg in the outer part of the oxide, MgAl 2 O 4 being detected by XRD together with cand a-Al 2 O 3 .

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