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

O. Thomann; M. Pihlatie; M. Rautanen; O. Himanen; J. Lagerbom; M. Mäkinen; T. Varis; T. Suhonen; J. Kiviaho

doi:10.1007/s11666-012-9880-9

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

O. Thomann, M. Pihlatie, M. Rautanen, O. Himanen, J. Lagerbom, M. Mäkinen, T. Varis, T. Suhonen, J. Kiviaho

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

26 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
Number of pages	9
Journal	Journal of Thermal Spray Technology
Volume	22
Issue number	5
DOIs	https://doi.org/10.1007/s11666-012-9880-9
Publication status	Published - Jun 2013
Publication type	A1 Journal article-refereed

Keywords

ASR
HVOF spraying
interconnect
protective coating
SOFC
spinel
stack testing

ASJC Scopus subject areas

Condensed Matter Physics
Materials Chemistry
Surfaces, Coatings and Films

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10.1007/s11666-012-9880-9

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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 MnCo1.8Fe 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.",

keywords = "ASR, HVOF spraying, interconnect, protective coating, SOFC, spinel, stack testing",

author = "O. Thomann and M. Pihlatie and M. Rautanen and O. Himanen and J. Lagerbom and M. M{\"a}kinen and T. Varis and T. Suhonen and J. Kiviaho",

year = "2013",

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T1 - Development and application of HVOF sprayed spinel protective coating for SOFC interconnects

AU - Thomann, O.

AU - Pihlatie, M.

AU - Rautanen, M.

AU - Himanen, O.

AU - Lagerbom, J.

AU - Mäkinen, M.

AU - Varis, T.

AU - Suhonen, T.

AU - Kiviaho, J.

PY - 2013/6

Y1 - 2013/6

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 MnCo1.8Fe 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.

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 MnCo1.8Fe 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.

KW - ASR

KW - HVOF spraying

KW - interconnect

KW - protective coating

KW - SOFC

KW - spinel

KW - stack testing

U2 - 10.1007/s11666-012-9880-9

DO - 10.1007/s11666-012-9880-9

M3 - Article

AN - SCOPUS:84878626773

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

Keywords

ASJC Scopus subject areas

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