In-service degradation of interconnector materials for solid oxide fuel cells

Sanni Mustala, Juha Veivo, Pertti Auerkari, Jari Kiviaho, Matti Noponen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

Abstract

The oxide growth and thermal degradation characteristics of three SOFC interconnector alloys have been investigated particularly for the cathode side conditions.The tested materials were ferritic stainless alloys including one common standard grade (alloy 430) and two alloys (Crofer 22 APU, ZMG 232) specifically designed for interconnector service.All three alloys appear to follow parabolic oxidation within the range of testing conditions (up to 500 h at 740 °C in air).A somewhat more pronounced oxidation was found in alloys ZMG 232 and Crofer 22 APU than in alloy 430.During oxidation, a consistent decrease inof iron and increase inof chromium and manganese were observed in the surface oxide.Some chromium transport was detected on the cathode side surface of the cell after 500 h at 740 °C.The results emphasise the importance of an appropriate coating for of the interconnectors, to prevent chromium poisoning on the cathode.A natural coating material would be similar or compatible with the ceramic cathode.Such a coating also has the additional advantage that simpler and cheaper steel grades could be used as the interconnector material.
Original languageEnglish
Title of host publicationApplied Material Research at VTT
Subtitle of host publicationSymposium on Applied Materials
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Pages40-49
ISBN (Electronic)951-38-6312-3
ISBN (Print)951-38-6311-5
Publication statusPublished - 2006
MoE publication typeB3 Non-refereed article in conference proceedings
EventInternal Symposium on Applied Materials - Espoo, Finland
Duration: 8 Jun 20068 Jun 2006

Publication series

NameVTT Symposium
PublisherVTT
Number244
ISSN (Print)0357-9387
ISSN (Electronic)1455-0873

Conference

ConferenceInternal Symposium on Applied Materials
CountryFinland
CityEspoo
Period8/06/068/06/06

Fingerprint

solid oxide fuel cells
degradation
cathodes
chromium
coatings
oxidation
grade
oxides
poisoning
thermal degradation
manganese
steels
ceramics
iron
air
cells

Cite this

Mustala, S., Veivo, J., Auerkari, P., Kiviaho, J., & Noponen, M. (2006). In-service degradation of interconnector materials for solid oxide fuel cells. In Applied Material Research at VTT: Symposium on Applied Materials (pp. 40-49). Espoo: VTT Technical Research Centre of Finland. VTT Symposium, No. 244
Mustala, Sanni ; Veivo, Juha ; Auerkari, Pertti ; Kiviaho, Jari ; Noponen, Matti. / In-service degradation of interconnector materials for solid oxide fuel cells. Applied Material Research at VTT: Symposium on Applied Materials. Espoo : VTT Technical Research Centre of Finland, 2006. pp. 40-49 (VTT Symposium; No. 244).
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Mustala, S, Veivo, J, Auerkari, P, Kiviaho, J & Noponen, M 2006, In-service degradation of interconnector materials for solid oxide fuel cells. in Applied Material Research at VTT: Symposium on Applied Materials. VTT Technical Research Centre of Finland, Espoo, VTT Symposium, no. 244, pp. 40-49, Internal Symposium on Applied Materials, Espoo, Finland, 8/06/06.

In-service degradation of interconnector materials for solid oxide fuel cells. / Mustala, Sanni; Veivo, Juha; Auerkari, Pertti; Kiviaho, Jari; Noponen, Matti.

Applied Material Research at VTT: Symposium on Applied Materials. Espoo : VTT Technical Research Centre of Finland, 2006. p. 40-49 (VTT Symposium; No. 244).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

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N2 - The oxide growth and thermal degradation characteristics of three SOFC interconnector alloys have been investigated particularly for the cathode side conditions.The tested materials were ferritic stainless alloys including one common standard grade (alloy 430) and two alloys (Crofer 22 APU, ZMG 232) specifically designed for interconnector service.All three alloys appear to follow parabolic oxidation within the range of testing conditions (up to 500 h at 740 °C in air).A somewhat more pronounced oxidation was found in alloys ZMG 232 and Crofer 22 APU than in alloy 430.During oxidation, a consistent decrease inof iron and increase inof chromium and manganese were observed in the surface oxide.Some chromium transport was detected on the cathode side surface of the cell after 500 h at 740 °C.The results emphasise the importance of an appropriate coating for of the interconnectors, to prevent chromium poisoning on the cathode.A natural coating material would be similar or compatible with the ceramic cathode.Such a coating also has the additional advantage that simpler and cheaper steel grades could be used as the interconnector material.

AB - The oxide growth and thermal degradation characteristics of three SOFC interconnector alloys have been investigated particularly for the cathode side conditions.The tested materials were ferritic stainless alloys including one common standard grade (alloy 430) and two alloys (Crofer 22 APU, ZMG 232) specifically designed for interconnector service.All three alloys appear to follow parabolic oxidation within the range of testing conditions (up to 500 h at 740 °C in air).A somewhat more pronounced oxidation was found in alloys ZMG 232 and Crofer 22 APU than in alloy 430.During oxidation, a consistent decrease inof iron and increase inof chromium and manganese were observed in the surface oxide.Some chromium transport was detected on the cathode side surface of the cell after 500 h at 740 °C.The results emphasise the importance of an appropriate coating for of the interconnectors, to prevent chromium poisoning on the cathode.A natural coating material would be similar or compatible with the ceramic cathode.Such a coating also has the additional advantage that simpler and cheaper steel grades could be used as the interconnector material.

M3 - Conference article in proceedings

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Mustala S, Veivo J, Auerkari P, Kiviaho J, Noponen M. In-service degradation of interconnector materials for solid oxide fuel cells. In Applied Material Research at VTT: Symposium on Applied Materials. Espoo: VTT Technical Research Centre of Finland. 2006. p. 40-49. (VTT Symposium; No. 244).