Effect of Active Elements on the Oxidation Behaviour of Cr2O3-Formers

Bennett, M. J.; Moon, D. P.

doi:10.1007/978-94-009-1147-5_8

Cited by 30 publications

(8 citation statements)

References 23 publications

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“…Attempts have been made in the last 10 years to elucidate the mechanisms by which yttrium acts. Better results were obtained in case of chromia scales than for alumina scales [3][4][5][6]. In alumina scales, various and sometimes opposite mechanisms have been suggested in order to explain the yttrium effect, particularly on transport properties.…”

Section: Introductionmentioning

confidence: 98%

Influence of yttrium on microstructure and point defects in ?-Al2O3 in relation to oxidation

1993

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Although the influence of yttrium on transport properties of 0~ alumina has been the object of many studies, the mechanisms by which this element acts have not yet been elucidated. The method of modification by yttrium of the microstructure of 0c polycrystalline alumina and the nature of the point defects created by this doping element were studied. The results obtained are discussed in relation to alumina transport properties and especially in relation with the effect of yttrium on the oxidation mechanism of alumina former alloys, taking into account the doping amount.

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Section: Introductionmentioning

confidence: 98%

Influence of yttrium on microstructure and point defects in ?-Al2O3 in relation to oxidation

1993

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“…Manganese (0.4–0.8 wt%) and titanium (0.2 wt%) are the minor elements in the Crofer 22 APU alloy. The oxygen affinity of manganese and titanium is higher than that of chromium, 34,35 and these species diffuse faster than chromium 36,37 . Manganese is added in the Crofer 22 APU alloy to protect the alloy from chromium evaporation, and titanium is added to improve the electrical conductivity 38 .…”

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confidence: 99%

Thermochemical Compatibility of a Seal Glass with Different Solid Oxide Cell Components

Mahapatra

2010

Int J Applied Ceramic Tech

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Thermochemical compatibility of an aluminosilicate glass (SABS‐0) with Crofer 22 APU, nickel, and NiTiHf alloy has been studied for solid oxide cell use. Local SABS‐0 devitrification occurs near the interfaces of Crofer 22 APU/SABS‐0 and Ni/SABS‐0 samples. But extensive SABS‐0 devitrification is observed at the NiTiHf/SABS‐0 interface. The SABS‐0 elements diffuse a few microns into the Crofer 22 APU alloy and the nickel, or vice versa. But the SABS‐0 and NiTiHf elements diffuse into each other at ∼25 μm. The SABS‐0 glass is thermochemically compatible with the Crofer 22 APU and the nickel but not with the NiTiHf alloy.

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“…De nombreux articles décrivent le rôle bénéfique joué par les éléments actifs sur le comportement à l'oxydation des métaux et des alliages (18,19,20). Parmi les effets bénéfiques, outre l'oxydation sélective de certains éléments et une cinétique d'oxydation ralentie (21,22), nous pouvons citer l'augmentation de l'adhérence de la couche d'oxyde, la modification du mécanisme de croissance (passage d'un mode cationique à un mode anionique) et la modification de la morphologie des grains d'oxyde (diminution de la taille de grains).…”

Section: Influence De La Chimie Du Matériau Sur Les Couches Oxydesunclassified

Microstructure et chimie du substrat

Molins

2009

PlastOx 2007 - Mécanismes Et Mécanique Des Interactions Plasticité - Environnement

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Résumé. Plusieurs exemples d'interactions microstructure -chimie -comportement des matériaux sont illustrés dans ce chapitre, à savoir l'influence du matériau et de sa microstructure sur les mécanismes d'oxydation et le type d'oxydes développés, inversement l'effet de l'oxydation sur les modifications microstructurales et chimiques du matériau et l'influence de la composition chimique (dont les éléments mineurs) du matériau sur la nature des couches oxydes et leur adhérence. Un exemple de ruine chimique dans le cas d'alliages FeCrAl sera présentée ainsi que certains effets mécaniques sur les phénomènes de croissance des couches.

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Effect of Active Elements on the Oxidation Behaviour of Cr2O3-Formers

Cited by 30 publications

References 23 publications

Influence of yttrium on microstructure and point defects in ?-Al2O3 in relation to oxidation

Influence of yttrium on microstructure and point defects in ?-Al2O3 in relation to oxidation

Thermochemical Compatibility of a Seal Glass with Different Solid Oxide Cell Components

Microstructure et chimie du substrat

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