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000012260 084__ $$2WoS$$aMaterials Science, Multidisciplinary
000012260 084__ $$2WoS$$aMetallurgy & Metallurgical Engineering
000012260 1001_ $$0P:(DE-HGF)0$$aYoung, D.J.$$b0
000012260 245__ $$aOxidation Kinetics of Y-doped FeCrAl-Alloys in Low and High pO2 Gases
000012260 260__ $$aWeinheim [u.a.]$$bWiley-VCH$$c2010
000012260 300__ $$a838  -844
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000012260 440_0 $$06470$$aMaterials and Corrosion$$v61$$x0947-5117$$y10
000012260 500__ $$aThe authors are grateful to Mr. H. Cosler at the Forschungszentrum Julich for thermogravimetry measurements and two-stage oxidation experiments. Part of the work was performed under the funding of the European Commission (Project acronym SMILER, G5RD-CT-2001-0530) and Deutsche Forschungsgemeinshaft (Project No. NA-615-2).
000012260 520__ $$aA model Fe-20Cr-5Al-0.05Y alloy was oxidized in Ar-20%O-2 and Ar-4%H-2-7%H2O at 1200-1300 degrees C. Two-stage oxidation experiments using oxygen isotope tracers showed that inward oxygen diffusion was predominant in both gases, but more isotope exchange was observed in the H-2/H2O gas reaction. The alumina scales formed in both gases were composed of columnar grains, the lateral size of which increased linearly with depth beneath the scale surface. Thermogravimetric measurement of oxygen uptake revealed kinetics which were intermediate to parabolic and cubic kinetic rate laws. A model based on grain boundary diffusion control coupled with competitive oxide grain growth accounts satisfactorily for the results when the requirement for a divergence-free flux within the scale is imposed. This treatment shows that the oxide grain boundary diffusion coefficient is lower when H2O is the oxidant. It is concluded that hydrogen slows the grain boundary diffusion process by altering the nature of the diffusing species.
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000012260 7001_ $$0P:(DE-Juel1)VDB2705$$aNaumenko, D.$$b1$$uFZJ
000012260 7001_ $$0P:(DE-Juel1)VDB2712$$aNiewolak, L.$$b2$$uFZJ
000012260 7001_ $$0P:(DE-Juel1)129810$$aWessel, E.$$b3$$uFZJ
000012260 7001_ $$0P:(DE-Juel1)129795$$aSingheiser, L.$$b4$$uFZJ
000012260 7001_ $$0P:(DE-Juel1)129782$$aQuadakkers, W. J.$$b5$$uFZJ
000012260 773__ $$0PERI:(DE-600)1481051-7$$a10.1002/maco.200905432$$gVol. 61, p. 838  -844$$p838  -844$$q61<838  -844$$tMaterials and corrosion$$v61$$x0947-5117$$y2010
000012260 8567_ $$uhttp://dx.doi.org/10.1002/maco.200905432
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