This title appears in the Scientific Report :
2004
Please use the identifier:
http://dx.doi.org/10.1023/B:OXID.0000016274.78642.ae in citations.
Growth Rates of Alumina Scales on FeCrAl Alloys
Growth Rates of Alumina Scales on FeCrAl Alloys
The growth rates of alumina scales formed on high-temperature alloys often show a strong deviation from classical parabolic kinetics, and frequently scale growth rates near to a cubic time dependence are observed. This is e. g. the case for most RE doped Fe - Cr - Al- alloys oxidized at temperatures...
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Personal Name(s): | Quadakkers, W. J. |
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Naumenko, D. / Wessel, E. / Kochubey, V. / Singheiser, L. | |
Contributing Institute: |
Werkstoffstruktur und Eigenschaften; IWV-2 |
Published in: | Oxidation of metals, 61 (2004) |
Imprint: |
Dordrecht [u.a.]
Springer Science + Business Media B.V
2004
|
DOI: |
10.1023/B:OXID.0000016274.78642.ae |
Document Type: |
Journal Article |
Research Program: |
Werkstoffsysteme für Kraftwerke |
Series Title: |
Oxidation of Metals
61 |
Subject (ZB): | |
Publikationsportal JuSER |
The growth rates of alumina scales formed on high-temperature alloys often show a strong deviation from classical parabolic kinetics, and frequently scale growth rates near to a cubic time dependence are observed. This is e. g. the case for most RE doped Fe - Cr - Al- alloys oxidized at temperatures in the range of 1000 to 1300degreesC. For a number of components made of Fe - Cr - Al alloys, which e. g. prevail in car catalyst carriers, gas burners or hot-gas filters, the detailed knowledge of the rate law governing scaling kinetics is an absolutely necessary requirement for a reliable prediction of the component lifetime and/or the materials application limits. It seems that for ideally gastight alpha-Al2O3 scales a near-cubic time dependence is more a rule than an exception, although the frequently used methods for evaluating measured oxidation data might lead to the erroneous conclusion that the scale growth is governed by a transient-oxidation stage followed by parabolic oxidation. Deviations from an ideal, near-cubic time dependence of the oxidation kinetics of the Fe - Cr - Al alloys are caused by scale cracking during thermal cycling and/or local inhomogenities in the alloy and/or the scale. |