Influence of powder composition and manufacturing method on electrical and chromium barrier properties of atmospheric plasma sprayed spinel coatings prepared from MnCo2O4 and Mn2CoO4 + Co powders on Crofer 22 APU interconnectors

J. Puranen (Corresponding Author), Mikko Pihlatie, Juha Lagerbom, T. Salminen, J. Laakso, L. Hyvärinen, M. Kylmälahti, Olli Himanen, Jari Kiviaho, P. Vuoristo

Research output: Contribution to journalArticleScientificpeer-review

20 Citations (Scopus)

Abstract

Protective coatings based on manganese cobalt oxide spinels are required in solid oxide fuel cells (SOFCs) to prevent the evaporation of volatile Cr(VI)-compounds from the metallic interconnectors and to minimize high temperature corrosion. Atmospheric plasma spraying (APS) was used to manufacture dense manganese cobalt oxide protective coatings on Crofer 22 APU substrates by employing two different spinel powders. The spray powders were MnCo2O4 and Mn2CoO4 + Co (equivalence for Mn1.5Co1.5O4). The Mn2CoO4 + Co powder was prepared by agglomerating the oxide powder with fine metallic cobalt powder. The coated substrates were oxidized at 700 °C in air for 1000 h. During the high temperature oxidation, a four-point on-line measurement technique with a current density of 640 mA/cm2 was simultaneously used for area specific resistance (ASR) studies. The coatings were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), an energy dispersive spectrometer (EDS) and Raman spectroscopy. The APS coatings had dense microstructure, which decreased the oxidation of the substrate. The MnCo2O4 coating showed indication of some Cr-migration, whereas Mn2CoO4 + Co showed good Cr-barrier properties. The ASR test showed that APS coated Mn2CoO4 + Co is a promising candidate material for SOFC interconnect applications.
Original languageEnglish
Pages (from-to)17246-17257
Number of pages11
JournalInternational Journal of Hydrogen Energy
Volume39
Issue number30
DOIs
Publication statusPublished - 2014
MoE publication typeA1 Journal article-refereed

Fingerprint

Sprayed coatings
spinel
chromium
Chromium
manufacturing
plasma spraying
Plasma spraying
Plasmas
coatings
Powders
Cobalt
Chemical analysis
cobalt oxides
protective coatings
manganese oxides
Protective coatings
solid oxide fuel cells
Solid oxide fuel cells (SOFC)
Coatings
Manganese

Keywords

  • solid oxide fuel cells
  • metallic interconnect
  • plasma spraying
  • spinel coatings
  • ASR
  • ProperPart

Cite this

@article{5e2e7200439b4d3a9313fc797864efe4,
title = "Influence of powder composition and manufacturing method on electrical and chromium barrier properties of atmospheric plasma sprayed spinel coatings prepared from MnCo2O4 and Mn2CoO4 + Co powders on Crofer 22 APU interconnectors",
abstract = "Protective coatings based on manganese cobalt oxide spinels are required in solid oxide fuel cells (SOFCs) to prevent the evaporation of volatile Cr(VI)-compounds from the metallic interconnectors and to minimize high temperature corrosion. Atmospheric plasma spraying (APS) was used to manufacture dense manganese cobalt oxide protective coatings on Crofer 22 APU substrates by employing two different spinel powders. The spray powders were MnCo2O4 and Mn2CoO4 + Co (equivalence for Mn1.5Co1.5O4). The Mn2CoO4 + Co powder was prepared by agglomerating the oxide powder with fine metallic cobalt powder. The coated substrates were oxidized at 700 °C in air for 1000 h. During the high temperature oxidation, a four-point on-line measurement technique with a current density of 640 mA/cm2 was simultaneously used for area specific resistance (ASR) studies. The coatings were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), an energy dispersive spectrometer (EDS) and Raman spectroscopy. The APS coatings had dense microstructure, which decreased the oxidation of the substrate. The MnCo2O4 coating showed indication of some Cr-migration, whereas Mn2CoO4 + Co showed good Cr-barrier properties. The ASR test showed that APS coated Mn2CoO4 + Co is a promising candidate material for SOFC interconnect applications.",
keywords = "solid oxide fuel cells, metallic interconnect, plasma spraying, spinel coatings, ASR, ProperPart",
author = "J. Puranen and Mikko Pihlatie and Juha Lagerbom and T. Salminen and J. Laakso and L. Hyv{\"a}rinen and M. Kylm{\"a}lahti and Olli Himanen and Jari Kiviaho and P. Vuoristo",
year = "2014",
doi = "10.1016/j.ijhydene.2014.08.016",
language = "English",
volume = "39",
pages = "17246--17257",
journal = "International Journal of Hydrogen Energy",
issn = "0360-3199",
publisher = "Elsevier",
number = "30",

}

Influence of powder composition and manufacturing method on electrical and chromium barrier properties of atmospheric plasma sprayed spinel coatings prepared from MnCo2O4 and Mn2CoO4 + Co powders on Crofer 22 APU interconnectors. / Puranen, J. (Corresponding Author); Pihlatie, Mikko; Lagerbom, Juha; Salminen, T.; Laakso, J.; Hyvärinen, L.; Kylmälahti, M.; Himanen, Olli; Kiviaho, Jari; Vuoristo, P.

In: International Journal of Hydrogen Energy, Vol. 39, No. 30, 2014, p. 17246-17257.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Influence of powder composition and manufacturing method on electrical and chromium barrier properties of atmospheric plasma sprayed spinel coatings prepared from MnCo2O4 and Mn2CoO4 + Co powders on Crofer 22 APU interconnectors

AU - Puranen, J.

AU - Pihlatie, Mikko

AU - Lagerbom, Juha

AU - Salminen, T.

AU - Laakso, J.

AU - Hyvärinen, L.

AU - Kylmälahti, M.

AU - Himanen, Olli

AU - Kiviaho, Jari

AU - Vuoristo, P.

PY - 2014

Y1 - 2014

N2 - Protective coatings based on manganese cobalt oxide spinels are required in solid oxide fuel cells (SOFCs) to prevent the evaporation of volatile Cr(VI)-compounds from the metallic interconnectors and to minimize high temperature corrosion. Atmospheric plasma spraying (APS) was used to manufacture dense manganese cobalt oxide protective coatings on Crofer 22 APU substrates by employing two different spinel powders. The spray powders were MnCo2O4 and Mn2CoO4 + Co (equivalence for Mn1.5Co1.5O4). The Mn2CoO4 + Co powder was prepared by agglomerating the oxide powder with fine metallic cobalt powder. The coated substrates were oxidized at 700 °C in air for 1000 h. During the high temperature oxidation, a four-point on-line measurement technique with a current density of 640 mA/cm2 was simultaneously used for area specific resistance (ASR) studies. The coatings were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), an energy dispersive spectrometer (EDS) and Raman spectroscopy. The APS coatings had dense microstructure, which decreased the oxidation of the substrate. The MnCo2O4 coating showed indication of some Cr-migration, whereas Mn2CoO4 + Co showed good Cr-barrier properties. The ASR test showed that APS coated Mn2CoO4 + Co is a promising candidate material for SOFC interconnect applications.

AB - Protective coatings based on manganese cobalt oxide spinels are required in solid oxide fuel cells (SOFCs) to prevent the evaporation of volatile Cr(VI)-compounds from the metallic interconnectors and to minimize high temperature corrosion. Atmospheric plasma spraying (APS) was used to manufacture dense manganese cobalt oxide protective coatings on Crofer 22 APU substrates by employing two different spinel powders. The spray powders were MnCo2O4 and Mn2CoO4 + Co (equivalence for Mn1.5Co1.5O4). The Mn2CoO4 + Co powder was prepared by agglomerating the oxide powder with fine metallic cobalt powder. The coated substrates were oxidized at 700 °C in air for 1000 h. During the high temperature oxidation, a four-point on-line measurement technique with a current density of 640 mA/cm2 was simultaneously used for area specific resistance (ASR) studies. The coatings were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), an energy dispersive spectrometer (EDS) and Raman spectroscopy. The APS coatings had dense microstructure, which decreased the oxidation of the substrate. The MnCo2O4 coating showed indication of some Cr-migration, whereas Mn2CoO4 + Co showed good Cr-barrier properties. The ASR test showed that APS coated Mn2CoO4 + Co is a promising candidate material for SOFC interconnect applications.

KW - solid oxide fuel cells

KW - metallic interconnect

KW - plasma spraying

KW - spinel coatings

KW - ASR

KW - ProperPart

U2 - 10.1016/j.ijhydene.2014.08.016

DO - 10.1016/j.ijhydene.2014.08.016

M3 - Article

VL - 39

SP - 17246

EP - 17257

JO - International Journal of Hydrogen Energy

JF - International Journal of Hydrogen Energy

SN - 0360-3199

IS - 30

ER -