This title appears in the Scientific Report :
2005
Please use the identifier:
http://dx.doi.org/10.1016/j.matchar.2005.07.003 in citations.
Optical Fluorescence Spectroscopy for Identification of Minor Oxide Phases in Alumina Scales Grown on High Temperature Alloys
Optical Fluorescence Spectroscopy for Identification of Minor Oxide Phases in Alumina Scales Grown on High Temperature Alloys
In the present study laser induced fluorescence optical spectroscopy (LIFOS) has been used for characterization of alumina based surface scales formed during oxidation of high temperature alloys. Prior to the analysis of oxide scales, a set of reference data has been obtained on single crystals of a...
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Personal Name(s): | Niewolak, L. |
---|---|
Naumenko, D. / Wessel, E. / Singheiser, L. / Quadakkers, W. J. | |
Contributing Institute: |
Werkstoffstruktur und Eigenschaften; IWV-2 |
Published in: | Materials characterization, 55 (2005) |
Imprint: |
New York, NY
Science Direct
2005
|
DOI: |
10.1016/j.matchar.2005.07.003 |
Document Type: |
Journal Article |
Research Program: |
Werkstoffsysteme für Kraftwerke |
Series Title: |
Materials Characterization
55 |
Subject (ZB): | |
Publikationsportal JuSER |
In the present study laser induced fluorescence optical spectroscopy (LIFOS) has been used for characterization of alumina based surface scales formed during oxidation of high temperature alloys. Prior to the analysis of oxide scales, a set of reference data has been obtained on single crystals of alpha-Al2O3 and several oxide phases (y(3)Ak(5)O(12), YAlO3 and MgAl2O4) frequently found as minor constituents in the alumina scales. A number of effects, which can affect the fluorescence spectra has been studied on the single crystals. Hence the analyses were carried out at different temperatures in the range of 77 to 303 K, at different laser powers and using two primary laser wavelengths.The reference spectra were used as a basis for phase analyses of the oxide scales formed on FeCrAl-alloys during air oxidation at 1200 degrees C. The spectrometry results of the oxide scales were compared with the data obtained with SEM and XRD. Although identification of the minor alumina scale phases using LIFOS appears to be possible, care should be taken when interpreting the results. The main reason is by far stronger fluorescence from alumina, however other important effects are also discussed, which are responsible for discrepancies between the spectra obtained from "ideal" reference specimens and those from the minor phases in oxide scales. (c) 2005 Elsevier Inc. All rights reserved. |