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

Olivier Thomann; Mikko Pihlatie; Markus Rautanen; Olli Himanen; Juha Lagerbom; Maija Mäkinen; Tommi Varis; Tomi Suhonen; Jari Kiviaho

doi:10.1007/s11666-012-9880-9

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

Olivier Thomann^*
, Mikko Pihlatie
, Markus Rautanen
, Olli Himanen
, Juha Lagerbom
, Maija Mäkinen
, Tommi Varis
, Tomi Suhonen
, Jari Kiviaho

^*Corresponding author for this work

VTT (former employee or external)

Research output: Contribution to journal › Article › Scientific › peer-review

27 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 MnCo_1.8Fe_0.2O₄ 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 language	English
Pages (from-to)	631-639
Journal	Journal of Thermal Spray Technology
Volume	22
Issue number	5
DOIs	https://doi.org/10.1007/s11666-012-9880-9
Publication status	Published - 2013
MoE publication type	A1 Journal article-refereed

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 7 Affordable and Clean Energy

Keywords

ASR
HVOF spraying
interconnect
protective coating
SOFC
spinel
stack testing
ProperTune

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10.1007/s11666-012-9880-9

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",

author = "Olivier Thomann and Mikko Pihlatie and Markus Rautanen and Olli Himanen and Juha Lagerbom and Maija M{\"a}kinen and Tommi Varis and Tomi Suhonen and Jari Kiviaho",

year = "2013",

doi = "10.1007/s11666-012-9880-9",

language = "English",

volume = "22",

pages = "631--639",

journal = "Journal of Thermal Spray Technology",

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TY - JOUR

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

SN - 1059-9630

VL - 22

SP - 631

EP - 639

JO - Journal of Thermal Spray Technology

JF - Journal of Thermal Spray Technology

IS - 5

ER -

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

Abstract

UN SDGs

Keywords

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Improving sealing, electrical contacts, and corrosion resistance in solid oxide fuel cell stacks: Dissertation

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