MnCo2O4 spinel chromium barrier coatigns coatings for SOFC interconnect by HVOF

Juha Lagerbom, Tommi Varis, J Puranen, Mikko Pihlatie, Olli Himanen, V Saarinen, Jari Kiviaho, Erja Turunen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

Chromia released from steel parts used for interconnect plates by evaporation and condensation can quickly degrade the cell (cathode) performance in solid oxide fuel cell SOFC. Coatings on top of the IC plate can work as a chromium evaporation barrier. The coating material should have good electrical conductivity, high temperature stability and nearly the same coefficient of thermal expansion as the cell materials. One candidate for the coating material is MnCo2O4 spinel because of its suitable properties. High velocity oxy fuel (HVOF) spraying was used for the coating application on Crofer 22 APU steel samples. Using commercial and self made spray dried powders together with an HV2000 spray gun it was possible to successfully manufacture, well adhering, dense and reasonably uniform coatings. The samples were tested in oxidation exposure tests in air followed by post analysis in SEM. Powders and coatings microstructures are presented here, both before and after exposure. It was found out that together with spraying parameters the powder characteristics used influence clearly to the coating quality. Especially as very thin coatings was aimed with dense structure fine powders was found to be essential
Original languageEnglish
Title of host publication9th Liège Conference
Subtitle of host publicationMaterials for Advanced Power Engineering
EditorsJ. Lecomte-Beckers, Q. Contrepois, T. Beck, B. Kuhn
Place of PublicationLiege
Pages949
Publication statusPublished - 2010
MoE publication typeA4 Article in a conference publication

Fingerprint

spinel
chromium
coatings
sprayers
HVOF thermal spraying
evaporation
steels
cell cathodes
spraying
solid oxide fuel cells
thermal expansion
condensation
fine structure
microstructure
oxidation
electrical resistivity
scanning electron microscopy
air
coefficients
cells

Keywords

  • SOFC
  • interconnect
  • chromium barrier coatings
  • thermal spraying
  • MnCo2-xFexO4 spinel

Cite this

Lagerbom, J., Varis, T., Puranen, J., Pihlatie, M., Himanen, O., Saarinen, V., ... Turunen, E. (2010). MnCo2O4 spinel chromium barrier coatigns coatings for SOFC interconnect by HVOF. In J. Lecomte-Beckers, Q. Contrepois, T. Beck, & B. Kuhn (Eds.), 9th Liège Conference : Materials for Advanced Power Engineering (pp. 949 ). Liege.
Lagerbom, Juha ; Varis, Tommi ; Puranen, J ; Pihlatie, Mikko ; Himanen, Olli ; Saarinen, V ; Kiviaho, Jari ; Turunen, Erja. / MnCo2O4 spinel chromium barrier coatigns coatings for SOFC interconnect by HVOF. 9th Liège Conference : Materials for Advanced Power Engineering. editor / J. Lecomte-Beckers ; Q. Contrepois ; T. Beck ; B. Kuhn. Liege, 2010. pp. 949
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abstract = "Chromia released from steel parts used for interconnect plates by evaporation and condensation can quickly degrade the cell (cathode) performance in solid oxide fuel cell SOFC. Coatings on top of the IC plate can work as a chromium evaporation barrier. The coating material should have good electrical conductivity, high temperature stability and nearly the same coefficient of thermal expansion as the cell materials. One candidate for the coating material is MnCo2O4 spinel because of its suitable properties. High velocity oxy fuel (HVOF) spraying was used for the coating application on Crofer 22 APU steel samples. Using commercial and self made spray dried powders together with an HV2000 spray gun it was possible to successfully manufacture, well adhering, dense and reasonably uniform coatings. The samples were tested in oxidation exposure tests in air followed by post analysis in SEM. Powders and coatings microstructures are presented here, both before and after exposure. It was found out that together with spraying parameters the powder characteristics used influence clearly to the coating quality. Especially as very thin coatings was aimed with dense structure fine powders was found to be essential",
keywords = "SOFC, interconnect, chromium barrier coatings, thermal spraying, MnCo2-xFexO4 spinel",
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Lagerbom, J, Varis, T, Puranen, J, Pihlatie, M, Himanen, O, Saarinen, V, Kiviaho, J & Turunen, E 2010, MnCo2O4 spinel chromium barrier coatigns coatings for SOFC interconnect by HVOF. in J Lecomte-Beckers, Q Contrepois, T Beck & B Kuhn (eds), 9th Liège Conference : Materials for Advanced Power Engineering. Liege, pp. 949 .

MnCo2O4 spinel chromium barrier coatigns coatings for SOFC interconnect by HVOF. / Lagerbom, Juha; Varis, Tommi; Puranen, J; Pihlatie, Mikko; Himanen, Olli; Saarinen, V; Kiviaho, Jari; Turunen, Erja.

9th Liège Conference : Materials for Advanced Power Engineering. ed. / J. Lecomte-Beckers; Q. Contrepois; T. Beck; B. Kuhn. Liege, 2010. p. 949 .

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

TY - GEN

T1 - MnCo2O4 spinel chromium barrier coatigns coatings for SOFC interconnect by HVOF

AU - Lagerbom, Juha

AU - Varis, Tommi

AU - Puranen, J

AU - Pihlatie, Mikko

AU - Himanen, Olli

AU - Saarinen, V

AU - Kiviaho, Jari

AU - Turunen, Erja

PY - 2010

Y1 - 2010

N2 - Chromia released from steel parts used for interconnect plates by evaporation and condensation can quickly degrade the cell (cathode) performance in solid oxide fuel cell SOFC. Coatings on top of the IC plate can work as a chromium evaporation barrier. The coating material should have good electrical conductivity, high temperature stability and nearly the same coefficient of thermal expansion as the cell materials. One candidate for the coating material is MnCo2O4 spinel because of its suitable properties. High velocity oxy fuel (HVOF) spraying was used for the coating application on Crofer 22 APU steel samples. Using commercial and self made spray dried powders together with an HV2000 spray gun it was possible to successfully manufacture, well adhering, dense and reasonably uniform coatings. The samples were tested in oxidation exposure tests in air followed by post analysis in SEM. Powders and coatings microstructures are presented here, both before and after exposure. It was found out that together with spraying parameters the powder characteristics used influence clearly to the coating quality. Especially as very thin coatings was aimed with dense structure fine powders was found to be essential

AB - Chromia released from steel parts used for interconnect plates by evaporation and condensation can quickly degrade the cell (cathode) performance in solid oxide fuel cell SOFC. Coatings on top of the IC plate can work as a chromium evaporation barrier. The coating material should have good electrical conductivity, high temperature stability and nearly the same coefficient of thermal expansion as the cell materials. One candidate for the coating material is MnCo2O4 spinel because of its suitable properties. High velocity oxy fuel (HVOF) spraying was used for the coating application on Crofer 22 APU steel samples. Using commercial and self made spray dried powders together with an HV2000 spray gun it was possible to successfully manufacture, well adhering, dense and reasonably uniform coatings. The samples were tested in oxidation exposure tests in air followed by post analysis in SEM. Powders and coatings microstructures are presented here, both before and after exposure. It was found out that together with spraying parameters the powder characteristics used influence clearly to the coating quality. Especially as very thin coatings was aimed with dense structure fine powders was found to be essential

KW - SOFC

KW - interconnect

KW - chromium barrier coatings

KW - thermal spraying

KW - MnCo2-xFexO4 spinel

M3 - Conference article in proceedings

SN - 978-389-33668-5-9

SP - 949

BT - 9th Liège Conference

A2 - Lecomte-Beckers, J.

A2 - Contrepois, Q.

A2 - Beck, T.

A2 - Kuhn, B.

CY - Liege

ER -

Lagerbom J, Varis T, Puranen J, Pihlatie M, Himanen O, Saarinen V et al. MnCo2O4 spinel chromium barrier coatigns coatings for SOFC interconnect by HVOF. In Lecomte-Beckers J, Contrepois Q, Beck T, Kuhn B, editors, 9th Liège Conference : Materials for Advanced Power Engineering. Liege. 2010. p. 949