Characterization SOFC Interconnect Materials: Sandvik Sanergy HT and Crofer 22 APU

Olli Himanen, Stefan Holmström, Markus Rautanen, Ulf Bexell, Jari Kiviaho

Research output: Contribution to conferenceConference articleScientific

Abstract

Metallic interconnect plate materials used in solid oxide fuel cells must withstand both oxidizing and reducing conditions occurring on cathode and anode side of the cell, respectively. Ferritic steels with high chromium content are considered only economically and technically viable alternative. For this application, the formed chromium oxide scale is sufficiently protective and conducting. However, chromium evaporation from the interconnect materials causes cell degradation. To minimize this effect, and still have a sufficiently conductive oxide, a chromium barrier layer is needed, e.g by coating the material with a metal precursor that is oxidised. In this work, a new promising interconnect material Sanergy HT (AB Sandvik Materials Technology , Sweden) and the widely used Crofer 22 APU (ThyssenKrupp AG, Germany) were studied. Tested materials were uncoated Sanergy HT, uncoated Crofer 22 APU, and also Co-coated Sanergy HT. These materials were tested ex-situ with chromium evaporation measurements under oxidizing conditions, mass gain measurements under both oxidizing and reducing conditions, and also contact resistance measurements. Materials were also tested under real operating conditions in single repeating units. After each test the samples were analyzed by SEM/EDX on polished and FIB cut cross sections. Complementary analyses were done with XRD. Results of these tests will be published in the poster presentation.
Original languageEnglish
Publication statusPublished - 2008
MoE publication typeNot Eligible
EventFuel Cell Seminar & Exposition - Arizona, United States
Duration: 27 Oct 200830 Oct 2008

Conference

ConferenceFuel Cell Seminar & Exposition
CountryUnited States
CityArizona
Period27/10/0830/10/08

Fingerprint

chromium
evaporation
chromium oxides
Sweden
barrier layers
solid oxide fuel cells
contact resistance
cells
Germany
anodes
cathodes
steels
degradation
coatings
conduction
scanning electron microscopy
oxides
causes
cross sections
metals

Keywords

  • SOFC
  • interconnect
  • oxidation
  • chromium barrier coating

Cite this

Himanen, O., Holmström, S., Rautanen, M., Bexell, U., & Kiviaho, J. (2008). Characterization SOFC Interconnect Materials: Sandvik Sanergy HT and Crofer 22 APU. Paper presented at Fuel Cell Seminar & Exposition, Arizona, United States.
Himanen, Olli ; Holmström, Stefan ; Rautanen, Markus ; Bexell, Ulf ; Kiviaho, Jari. / Characterization SOFC Interconnect Materials: Sandvik Sanergy HT and Crofer 22 APU. Paper presented at Fuel Cell Seminar & Exposition, Arizona, United States.
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title = "Characterization SOFC Interconnect Materials: Sandvik Sanergy HT and Crofer 22 APU",
abstract = "Metallic interconnect plate materials used in solid oxide fuel cells must withstand both oxidizing and reducing conditions occurring on cathode and anode side of the cell, respectively. Ferritic steels with high chromium content are considered only economically and technically viable alternative. For this application, the formed chromium oxide scale is sufficiently protective and conducting. However, chromium evaporation from the interconnect materials causes cell degradation. To minimize this effect, and still have a sufficiently conductive oxide, a chromium barrier layer is needed, e.g by coating the material with a metal precursor that is oxidised. In this work, a new promising interconnect material Sanergy HT (AB Sandvik Materials Technology , Sweden) and the widely used Crofer 22 APU (ThyssenKrupp AG, Germany) were studied. Tested materials were uncoated Sanergy HT, uncoated Crofer 22 APU, and also Co-coated Sanergy HT. These materials were tested ex-situ with chromium evaporation measurements under oxidizing conditions, mass gain measurements under both oxidizing and reducing conditions, and also contact resistance measurements. Materials were also tested under real operating conditions in single repeating units. After each test the samples were analyzed by SEM/EDX on polished and FIB cut cross sections. Complementary analyses were done with XRD. Results of these tests will be published in the poster presentation.",
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author = "Olli Himanen and Stefan Holmstr{\"o}m and Markus Rautanen and Ulf Bexell and Jari Kiviaho",
year = "2008",
language = "English",
note = "Fuel Cell Seminar & Exposition ; Conference date: 27-10-2008 Through 30-10-2008",

}

Himanen, O, Holmström, S, Rautanen, M, Bexell, U & Kiviaho, J 2008, 'Characterization SOFC Interconnect Materials: Sandvik Sanergy HT and Crofer 22 APU' Paper presented at Fuel Cell Seminar & Exposition, Arizona, United States, 27/10/08 - 30/10/08, .

Characterization SOFC Interconnect Materials: Sandvik Sanergy HT and Crofer 22 APU. / Himanen, Olli; Holmström, Stefan; Rautanen, Markus; Bexell, Ulf; Kiviaho, Jari.

2008. Paper presented at Fuel Cell Seminar & Exposition, Arizona, United States.

Research output: Contribution to conferenceConference articleScientific

TY - CONF

T1 - Characterization SOFC Interconnect Materials: Sandvik Sanergy HT and Crofer 22 APU

AU - Himanen, Olli

AU - Holmström, Stefan

AU - Rautanen, Markus

AU - Bexell, Ulf

AU - Kiviaho, Jari

PY - 2008

Y1 - 2008

N2 - Metallic interconnect plate materials used in solid oxide fuel cells must withstand both oxidizing and reducing conditions occurring on cathode and anode side of the cell, respectively. Ferritic steels with high chromium content are considered only economically and technically viable alternative. For this application, the formed chromium oxide scale is sufficiently protective and conducting. However, chromium evaporation from the interconnect materials causes cell degradation. To minimize this effect, and still have a sufficiently conductive oxide, a chromium barrier layer is needed, e.g by coating the material with a metal precursor that is oxidised. In this work, a new promising interconnect material Sanergy HT (AB Sandvik Materials Technology , Sweden) and the widely used Crofer 22 APU (ThyssenKrupp AG, Germany) were studied. Tested materials were uncoated Sanergy HT, uncoated Crofer 22 APU, and also Co-coated Sanergy HT. These materials were tested ex-situ with chromium evaporation measurements under oxidizing conditions, mass gain measurements under both oxidizing and reducing conditions, and also contact resistance measurements. Materials were also tested under real operating conditions in single repeating units. After each test the samples were analyzed by SEM/EDX on polished and FIB cut cross sections. Complementary analyses were done with XRD. Results of these tests will be published in the poster presentation.

AB - Metallic interconnect plate materials used in solid oxide fuel cells must withstand both oxidizing and reducing conditions occurring on cathode and anode side of the cell, respectively. Ferritic steels with high chromium content are considered only economically and technically viable alternative. For this application, the formed chromium oxide scale is sufficiently protective and conducting. However, chromium evaporation from the interconnect materials causes cell degradation. To minimize this effect, and still have a sufficiently conductive oxide, a chromium barrier layer is needed, e.g by coating the material with a metal precursor that is oxidised. In this work, a new promising interconnect material Sanergy HT (AB Sandvik Materials Technology , Sweden) and the widely used Crofer 22 APU (ThyssenKrupp AG, Germany) were studied. Tested materials were uncoated Sanergy HT, uncoated Crofer 22 APU, and also Co-coated Sanergy HT. These materials were tested ex-situ with chromium evaporation measurements under oxidizing conditions, mass gain measurements under both oxidizing and reducing conditions, and also contact resistance measurements. Materials were also tested under real operating conditions in single repeating units. After each test the samples were analyzed by SEM/EDX on polished and FIB cut cross sections. Complementary analyses were done with XRD. Results of these tests will be published in the poster presentation.

KW - SOFC

KW - interconnect

KW - oxidation

KW - chromium barrier coating

M3 - Conference article

ER -

Himanen O, Holmström S, Rautanen M, Bexell U, Kiviaho J. Characterization SOFC Interconnect Materials: Sandvik Sanergy HT and Crofer 22 APU. 2008. Paper presented at Fuel Cell Seminar & Exposition, Arizona, United States.