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Titre :
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Metallic interconnects for solid oxide fuel cell: Performance of reactive element oxide coating during long time exposure (2011)
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Auteurs :
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S. Fontana, Auteur ;
S. Chevalier, Auteur ;
G. Caboche, Auteur
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Type de document :
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Article : texte imprimé
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Dans :
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Materials and corrosion (Vol. 62 N° 7, Juillet 2011)
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Article en page(s) :
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pp. 650–658
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Note générale :
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Génie Mécanique
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Langues :
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Anglais
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Index. décimale :
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620.1 (Essais des matériaux. Défauts des matériaux. Protection des matériaux)
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Tags :
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Metallic interconnect MOCVD Reactive element SOFC
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Résumé :
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One of challenges in improving the performance and cost-effectiveness of SOFCs (solid oxide fuel cells) is the development of suitable interconnects materials. Chromia-forming alloys and especially ferritic stainless steels, like Crofer22APU, are considered to be among the most promising candidate materials as interconnects in SOFC stacks. However, the performance of chromia-forming materials can be limited by the low electronic conductivity of the oxide scale (high ASR – area specific resistance – value). Such degradation are unacceptable regarding the long-term operation (>40 000 h). A previous study 1 demonstrated that in air, the addition of a nanometric reactive element oxide (La2O3) layer applied by metal organic chemical vapor deposition (MOCVD) drastically improved both corrosion rate and electrical properties of Crofer22APU and Haynes230 alloys for 100 h at 800 °C. In this present study coating performances were checked after 10 months (7500 h) and 20 months (15 000 h) at 800 °C in air. The corrosion products were carefully analyzed by SEM, EDX, and XRD. ASR measurements are realized after long time exposure. This study demonstrates that the Crofer22APU alloy has a good oxidation resistance after 15 000 h in air but this alloy has an ASR value equal to 0.370 Ω cm2. The coatings composed of a thin reactive element oxide such as La2O3 resulted in an important improvement in the high temperature oxidation resistance; the ASR values are equal to 0.154 Ω cm2. Haynes230 alloy has a better oxidation resistance but the formation of an insulating Al2O3/SiO2 layer could be detrimental.
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DEWEY :
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620.1
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ISSN :
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0947-5117
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En ligne :
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http://onlinelibrary.wiley.com/doi/10.1002/maco.201005857/abstract
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