CPL - Chalmers Publication Library
| Utbildning | Forskning | Styrkeområden | Om Chalmers | In English In English Ej inloggad.

The Formation of Oxide Scale on FeCrAl at 900°C in dry O2 and O2 + 40% H2O

Helena Josefsson (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; Fang Liu (Institutionen för teknisk fysik, Mikroskopi och mikroanalys) ; Jan-Erik Svensson (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; Mats Halvarsson (Institutionen för teknisk fysik, Mikroskopi och mikroanalys) ; Lars-Gunnar Johansson (Institutionen för kemi- och bioteknik, Oorganisk miljökemi)
206th ECS Meeting; Honolulu, HI; United States; 3 October 2004 through 8 October 2004 Vol. PV 2004-16 (2005), p. 56-66.
[Konferensbidrag, refereegranskat]

Polished Kanthal AF samples were oxidized isothermally at 900°C in O2 and in O2+40% H2O for between 1 and 168 hours. The samples were analysed gravimetrically, by Grazing-Incidence X-ray diffraction, Scanning Electron Microscopy, Energy Dispersive X-ray analysis and Auger Electron Spectroscopy profiling. Much of the surface is covered by a thin and smooth base oxide with Mg-rich nodules on top. In addition, patches of thick uneven oxide and RE-oxide protrusions are present on the surface. Exposure to O2+40% H2O results in significantly higher initial oxidation rate than dry O2. The presence of water vapour also influences oxide morphology. The thick oxide patches exhibit needle-like crystals in dry O2 while rounded oxide agglomerates dominate in O2/H2O. The chemical composition of the oxide was the same in O2 and in O2+40% H2O. α-Al 2O3, γ-Al2O3 and MgAl 2O4 form in both environments.



Denna post skapades 2006-01-19. Senast ändrad 2016-06-17.
CPL Pubid: 11850

 

Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Oorganisk miljökemi (2005-2014)
Institutionen för teknisk fysik, Mikroskopi och mikroanalys (2005-2012)

Ämnesområden

Materialteknik

Chalmers infrastruktur

Relaterade publikationer

Denna publikation ingår i:


Microstructural investigation on high temperature oxidation of Cr2O3-forming and Al2O3-forming steels