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Microstructural Investigation of the Initial Oxidation of the FeCrAlRE Alloy Kanthal AF in Dry and Wet O-2 at 600 and 800 degrees C

Sead Canovic (Institutionen för teknisk fysik, Mikroskopi och mikroanalys) ; J. Engkvist ; Fang Liu (Institutionen för teknisk fysik, Mikroskopi och mikroanalys) ; Haiping Lai (Institutionen för teknisk fysik, Mikroskopi och mikroanalys) ; Helena Götlind (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; Kristina Hellström (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; Jan-Erik Svensson (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; Lars-Gunnar Johansson (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; M. Olsson ; Mats Halvarsson (Institutionen för teknisk fysik, Mikroskopi och mikroanalys)
Journal of the Electrochemical Society (0013-4651). Vol. 157 (2010), 6, p. C223-C230.
[Artikel, refereegranskad vetenskaplig]

The FeCrAlRE (where RE is reactive element) alloy Kanthal AF was exposed isothermally at 600 and 800 degrees C for 72 h in dry O-2 and in O-2 with 10 vol % H2O. The mass gains were 3-5 times higher at the higher temperature. The presence of water vapor increased the oxidation rate at 800 degrees C, while no significant effect was observed at 600 degrees C. A thin two-layered oxide formed at 600 degrees C: an outer (Fe, Cr)(2)O-3 corundum-type oxide, containing some Al, and an inner, probably amorphous, Al-rich oxide. At 800 degrees C a two-layered oxide formed in both environments. The inner layer consisted of inward grown alpha-Al2O3. In dry O-2 the originally formed outward grown gamma-Al2O3 had transformed to alpha-Al2O3 after 72 h. Water vapor stabilized the outward grown gamma-Al2O3 and hence no transformation occurred after 72 h in humid environment. RE-rich oxide particles with varying composition (Y, Zr, and Ti) were distributed in the base oxide at both temperatures and in both environments. The RE-rich particles were separated from the alloy substrate by a layer of Al-rich oxide. At 800 degrees C the Y-rich RE particles were surrounded by thick oxide patches in both dry and humid O-2. (C) 2010 The Electrochemical Society. [DOI: 10.1149/1.3391447] All rights reserved.

Nyckelord: high-temperature oxidation, 900 degrees-c, water-vapor, alumina scales, oxide scales, cyclic oxidation, mg-incorporation, fecraire alloys, 40-percent h2o, growth



Denna post skapades 2010-06-07. Senast ändrad 2016-10-04.
CPL Pubid: 122409

 

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Institutioner (Chalmers)

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

Ämnesområden

Elektrokemi

Chalmers infrastruktur

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