Development and application of HVOF sprayed spinel protective coating for SOFC interconnects

Olivier Thomann (Corresponding Author), Mikko Pihlatie, Markus Rautanen, Olli Himanen, Juha Lagerbom, Maija Mäkinen, Tommi Varis, Tomi Suhonen, Jari Kiviaho

Research output: Contribution to journalArticleScientificpeer-review

20 Citations (Scopus)

Abstract

Protective coatings are needed for metallic interconnects used in solid oxide fuel cell (SOFC) stacks to prevent excessive high-temperature oxidation and evaporation of chromium species. These phenomena affect the lifetime of the stacks by increasing the area-specific resistance (ASR) and poisoning of the cathode. Protective MnCo2O4 and MnCo1.8Fe0.2O4 coatings were applied on ferritic steel interconnect material (Crofer 22 APU) by high velocity oxy fuel spraying. The substrate-coating systems were tested in long-term exposure tests to investigate their high-temperature oxidation behavior. Additionally, the ASRs were measured at 700 °C for 1000 h. Finally, a real coated interconnect was used in a SOFC single-cell stack for 6000 h. Post-mortem analysis was carried out with scanning electron microscopy. The deposited coatings reduced significantly the oxidation of the metal, exhibited low and stable ASR and reduced effectively the migration of chromium.
Original languageEnglish
Pages (from-to)631-639
Number of pages9
JournalJournal of Thermal Spray Technology
Volume22
Issue number5
DOIs
Publication statusPublished - 2013
MoE publication typeA1 Journal article-refereed

Fingerprint

protective coatings
Sprayed coatings
Protective coatings
solid oxide fuel cells
Solid oxide fuel cells (SOFC)
spinel
Thermooxidation
Chromium
Coatings
oxidation
chromium
HVOF thermal spraying
coatings
poisoning
Ferritic steel
Spraying
coating
Evaporation
Cathodes
cathodes

Keywords

  • ASR
  • HVOF spraying
  • interconnect
  • protective coating
  • SOFC
  • spinel
  • stack testing
  • ProperTune

Cite this

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title = "Development and application of HVOF sprayed spinel protective coating for SOFC interconnects",
abstract = "Protective coatings are needed for metallic interconnects used in solid oxide fuel cell (SOFC) stacks to prevent excessive high-temperature oxidation and evaporation of chromium species. These phenomena affect the lifetime of the stacks by increasing the area-specific resistance (ASR) and poisoning of the cathode. Protective MnCo2O4 and MnCo1.8Fe0.2O4 coatings were applied on ferritic steel interconnect material (Crofer 22 APU) by high velocity oxy fuel spraying. The substrate-coating systems were tested in long-term exposure tests to investigate their high-temperature oxidation behavior. Additionally, the ASRs were measured at 700 °C for 1000 h. Finally, a real coated interconnect was used in a SOFC single-cell stack for 6000 h. Post-mortem analysis was carried out with scanning electron microscopy. The deposited coatings reduced significantly the oxidation of the metal, exhibited low and stable ASR and reduced effectively the migration of chromium.",
keywords = "ASR, HVOF spraying, interconnect, protective coating, SOFC, spinel, stack testing, ProperTune",
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T1 - Development and application of HVOF sprayed spinel protective coating for SOFC interconnects

AU - Thomann, Olivier

AU - Pihlatie, Mikko

AU - Rautanen, Markus

AU - Himanen, Olli

AU - Lagerbom, Juha

AU - Mäkinen, Maija

AU - Varis, Tommi

AU - Suhonen, Tomi

AU - Kiviaho, Jari

PY - 2013

Y1 - 2013

N2 - Protective coatings are needed for metallic interconnects used in solid oxide fuel cell (SOFC) stacks to prevent excessive high-temperature oxidation and evaporation of chromium species. These phenomena affect the lifetime of the stacks by increasing the area-specific resistance (ASR) and poisoning of the cathode. Protective MnCo2O4 and MnCo1.8Fe0.2O4 coatings were applied on ferritic steel interconnect material (Crofer 22 APU) by high velocity oxy fuel spraying. The substrate-coating systems were tested in long-term exposure tests to investigate their high-temperature oxidation behavior. Additionally, the ASRs were measured at 700 °C for 1000 h. Finally, a real coated interconnect was used in a SOFC single-cell stack for 6000 h. Post-mortem analysis was carried out with scanning electron microscopy. The deposited coatings reduced significantly the oxidation of the metal, exhibited low and stable ASR and reduced effectively the migration of chromium.

AB - Protective coatings are needed for metallic interconnects used in solid oxide fuel cell (SOFC) stacks to prevent excessive high-temperature oxidation and evaporation of chromium species. These phenomena affect the lifetime of the stacks by increasing the area-specific resistance (ASR) and poisoning of the cathode. Protective MnCo2O4 and MnCo1.8Fe0.2O4 coatings were applied on ferritic steel interconnect material (Crofer 22 APU) by high velocity oxy fuel spraying. The substrate-coating systems were tested in long-term exposure tests to investigate their high-temperature oxidation behavior. Additionally, the ASRs were measured at 700 °C for 1000 h. Finally, a real coated interconnect was used in a SOFC single-cell stack for 6000 h. Post-mortem analysis was carried out with scanning electron microscopy. The deposited coatings reduced significantly the oxidation of the metal, exhibited low and stable ASR and reduced effectively the migration of chromium.

KW - ASR

KW - HVOF spraying

KW - interconnect

KW - protective coating

KW - SOFC

KW - spinel

KW - stack testing

KW - ProperTune

UR - http://urn.fi/URN:ISBN:978-951-38-8314-0

U2 - 10.1007/s11666-012-9880-9

DO - 10.1007/s11666-012-9880-9

M3 - Article

VL - 22

SP - 631

EP - 639

JO - Journal of Thermal Spray Technology

JF - Journal of Thermal Spray Technology

SN - 1059-9630

IS - 5

ER -