Glass coated compressible solid oxide fuel cell seals

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9 Citations (Scopus)

Abstract

With the growing footprint of solid oxide fuel cell stacks, there is a need to extend the operating range of compressible gaskets towards lower stress levels. This article describes a method to manufacture SOFC seals by coating a compressible sealing material (Thermiculite 866) with glass to obtain good sealing performance even at compression stresses as low as 0.1 MPa. Glass layer can be coated using an organic carrier consisting of terpineol, ethanol and ethyl cellulose. The coated seals can be heat treated by simply ramping the temperature up to operating temperature at 60 Kh-1 and therefore no extra steps, which are typical to glass seals, are required. Coated seals were manufactured using this route and evaluated both ex-situ and in a real stack. Leak rates of 0.1-0.3 ml (m min)-1 were measured at 2-25 mbar overpressure using 50/50 H2/N2. A 30-cell stack was manufactured and tested using coated seals. At nominal operating conditions of 0.25 A cm-2 and 650 °C average cathode temperature, 46% fuel utilization and 20% air utilization the stack had a total hydrogen cross leak of 60 ml min-1 corresponding to 0.7% of the inlet hydrogen flow rate.
Original languageEnglish
Pages (from-to)243-248
JournalJournal of Power Sources
Volume247
DOIs
Publication statusPublished - 2014
MoE publication typeA1 Journal article-refereed

Fingerprint

solid oxide fuel cells
Solid oxide fuel cells (SOFC)
Seals
Glass
glass
sealing
gaskets
Hydrogen
overpressure
footprints
hydrogen
Gaskets
operating temperature
cellulose
Sealants
ethyl alcohol
flow velocity
cathodes
Temperature
routes

Keywords

  • SOFC
  • seal
  • thermiculite 866
  • glass
  • leak
  • stack

Cite this

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title = "Glass coated compressible solid oxide fuel cell seals",
abstract = "With the growing footprint of solid oxide fuel cell stacks, there is a need to extend the operating range of compressible gaskets towards lower stress levels. This article describes a method to manufacture SOFC seals by coating a compressible sealing material (Thermiculite 866) with glass to obtain good sealing performance even at compression stresses as low as 0.1 MPa. Glass layer can be coated using an organic carrier consisting of terpineol, ethanol and ethyl cellulose. The coated seals can be heat treated by simply ramping the temperature up to operating temperature at 60 Kh-1 and therefore no extra steps, which are typical to glass seals, are required. Coated seals were manufactured using this route and evaluated both ex-situ and in a real stack. Leak rates of 0.1-0.3 ml (m min)-1 were measured at 2-25 mbar overpressure using 50/50 H2/N2. A 30-cell stack was manufactured and tested using coated seals. At nominal operating conditions of 0.25 A cm-2 and 650 °C average cathode temperature, 46{\%} fuel utilization and 20{\%} air utilization the stack had a total hydrogen cross leak of 60 ml min-1 corresponding to 0.7{\%} of the inlet hydrogen flow rate.",
keywords = "SOFC, seal, thermiculite 866, glass, leak, stack",
author = "Markus Rautanen and Olivier Thomann and Olli Himanen and Johan Tallgren and Jari Kiviaho",
year = "2014",
doi = "10.1016/j.jpowsour.2013.08.085",
language = "English",
volume = "247",
pages = "243--248",
journal = "Journal of Power Sources",
issn = "0378-7753",
publisher = "Elsevier",

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TY - JOUR

T1 - Glass coated compressible solid oxide fuel cell seals

AU - Rautanen, Markus

AU - Thomann, Olivier

AU - Himanen, Olli

AU - Tallgren, Johan

AU - Kiviaho, Jari

PY - 2014

Y1 - 2014

N2 - With the growing footprint of solid oxide fuel cell stacks, there is a need to extend the operating range of compressible gaskets towards lower stress levels. This article describes a method to manufacture SOFC seals by coating a compressible sealing material (Thermiculite 866) with glass to obtain good sealing performance even at compression stresses as low as 0.1 MPa. Glass layer can be coated using an organic carrier consisting of terpineol, ethanol and ethyl cellulose. The coated seals can be heat treated by simply ramping the temperature up to operating temperature at 60 Kh-1 and therefore no extra steps, which are typical to glass seals, are required. Coated seals were manufactured using this route and evaluated both ex-situ and in a real stack. Leak rates of 0.1-0.3 ml (m min)-1 were measured at 2-25 mbar overpressure using 50/50 H2/N2. A 30-cell stack was manufactured and tested using coated seals. At nominal operating conditions of 0.25 A cm-2 and 650 °C average cathode temperature, 46% fuel utilization and 20% air utilization the stack had a total hydrogen cross leak of 60 ml min-1 corresponding to 0.7% of the inlet hydrogen flow rate.

AB - With the growing footprint of solid oxide fuel cell stacks, there is a need to extend the operating range of compressible gaskets towards lower stress levels. This article describes a method to manufacture SOFC seals by coating a compressible sealing material (Thermiculite 866) with glass to obtain good sealing performance even at compression stresses as low as 0.1 MPa. Glass layer can be coated using an organic carrier consisting of terpineol, ethanol and ethyl cellulose. The coated seals can be heat treated by simply ramping the temperature up to operating temperature at 60 Kh-1 and therefore no extra steps, which are typical to glass seals, are required. Coated seals were manufactured using this route and evaluated both ex-situ and in a real stack. Leak rates of 0.1-0.3 ml (m min)-1 were measured at 2-25 mbar overpressure using 50/50 H2/N2. A 30-cell stack was manufactured and tested using coated seals. At nominal operating conditions of 0.25 A cm-2 and 650 °C average cathode temperature, 46% fuel utilization and 20% air utilization the stack had a total hydrogen cross leak of 60 ml min-1 corresponding to 0.7% of the inlet hydrogen flow rate.

KW - SOFC

KW - seal

KW - thermiculite 866

KW - glass

KW - leak

KW - stack

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

U2 - 10.1016/j.jpowsour.2013.08.085

DO - 10.1016/j.jpowsour.2013.08.085

M3 - Article

VL - 247

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EP - 248

JO - Journal of Power Sources

JF - Journal of Power Sources

SN - 0378-7753

ER -