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Journal of Materials Science

, Volume 42, Issue 14, pp 5778–5784 | Cite as

Chromium vaporization of the ferritic steel Crofer22APU and ODS Cr5Fe1Y2O3 alloy

  • E. KonyshevaEmail author
  • U. Seeling
  • A. Besmehn
  • L. Singheiser
  • K. Hilpert
Article

Abstract

The chromium vaporization rate of the Crofer22APU steel as compared to Cr5Fe1Y2O3 alloy was studied under humidified air at 800 °C over a period of up to 1300 h by using the transpiration method. Under oxidizing atmosphere, the Crofer22APU steel forms a (Cr,Mn)3O4 spinel layer on the surface, which hinders chromium release at 800 °C by about a factor of 3 as compared to Cr5Fe1Y2O3 alloy forming a pure chromia scale. The impact of minor alloying additives in the Crofer22APU ferritic steel on the chromium vaporization was considered. The steel with the lowest amount of Al and Si in the matrix exhibits a low chromium vaporization rate over 1300 h. The microstructure and composition of the oxide scales and surfaces formed were investigated using high-resolution scanning electron microscopy, X-ray photoelectron spectroscopy and time-of-flight secondary ion mass spectrometry. The results obtained give insight into the chromium vaporization mechanism.

Keywords

Oxide Scale Solid Oxide Fuel Cell Ferritic Stainless Steel Vaporization Chamber Chromium Release 

Notes

Acknowledgements

The authors thank Dr. E. Wessel for the SEM analysis as well as Dr. U. Breuer and Ms. A. Scholl for the TOF-SIMS analysis.

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • E. Konysheva
    • 1
    • 2
    Email author
  • U. Seeling
    • 3
  • A. Besmehn
    • 3
  • L. Singheiser
    • 1
  • K. Hilpert
    • 1
  1. 1.Institute for Materials and Processes in Energy Systems (IWV-2)Research Centre JuelichJuelichGermany
  2. 2.School of Chemistry, Purdie BuildingUniversity of St AndrewsFifeUK
  3. 3.Central Division of Analytical Chemistry (ZCH)Research Centre JuelichJuelichGermany

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