Effects of the first heat up procedure on mechanical properties of solid oxide fuel cell sealing materials

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7 Citations (Scopus)

Abstract

SOFC stack seals need to be correctly dimensioned to achieve a gas tight stack with low electrical contact resistances. Mechanical properties of SOFC stack sealing materials are presented for three assembly and first heat up procedures: applying full compressive stress at room temperature before first heat up (1), applying no compressive stress before first heat up and applying the full compressive stress at operating temperature (2), applying partial compressive stress at room temperature and full compressive stress at operating temperature after first heat up (3). The behaviour of the glass seal (Schott GM31107) is not affected significantly by compressive force during heat up. Compressibility of both compressible sealing material (Thermiculite CL87) and hybrid sealing material (Thermiculite CL87LS) was found to be about 40% (between 0.1 and 0.9 MPa) at room temperature but only about 4% (between 0.1 and 0.9 MPa) at 700 °C. Therefore it is beneficial to carry out as much of the compression as possible at room temperature before first heat up. This allows for maximum amount of deformability in the sealing materials resulting in the highest ability to compensate for stack manufacturing and assembly tolerances, which is needed to realize a gas tight stack with low electrical contact resistances.
Original languageEnglish
Pages (from-to)511-516
JournalJournal of Power Sources
Volume284
DOIs
Publication statusPublished - 2015
MoE publication typeA1 Journal article-refereed

Fingerprint

Sealants
sealing
solid oxide fuel cells
Solid oxide fuel cells (SOFC)
Compressive stress
mechanical properties
heat
Mechanical properties
room temperature
Contact resistance
contact resistance
operating temperature
Temperature
Seals
assembly
Gases
Hybrid materials
Formability
Compressibility
gases

Keywords

  • SOFC
  • seal
  • stack
  • hybrid
  • compression
  • stress

Cite this

@article{eb5bf6fb998345c7934dd2729ffecde3,
title = "Effects of the first heat up procedure on mechanical properties of solid oxide fuel cell sealing materials",
abstract = "SOFC stack seals need to be correctly dimensioned to achieve a gas tight stack with low electrical contact resistances. Mechanical properties of SOFC stack sealing materials are presented for three assembly and first heat up procedures: applying full compressive stress at room temperature before first heat up (1), applying no compressive stress before first heat up and applying the full compressive stress at operating temperature (2), applying partial compressive stress at room temperature and full compressive stress at operating temperature after first heat up (3). The behaviour of the glass seal (Schott GM31107) is not affected significantly by compressive force during heat up. Compressibility of both compressible sealing material (Thermiculite CL87) and hybrid sealing material (Thermiculite CL87LS) was found to be about 40{\%} (between 0.1 and 0.9 MPa) at room temperature but only about 4{\%} (between 0.1 and 0.9 MPa) at 700 °C. Therefore it is beneficial to carry out as much of the compression as possible at room temperature before first heat up. This allows for maximum amount of deformability in the sealing materials resulting in the highest ability to compensate for stack manufacturing and assembly tolerances, which is needed to realize a gas tight stack with low electrical contact resistances.",
keywords = "SOFC, seal, stack, hybrid, compression, stress",
author = "Markus Rautanen and Valtteri Pulkkinen and Johan Tallgren and Olli Himanen and Jari Kiviaho",
year = "2015",
doi = "10.1016/j.jpowsour.2015.03.012",
language = "English",
volume = "284",
pages = "511--516",
journal = "Journal of Power Sources",
issn = "0378-7753",
publisher = "Elsevier",

}

TY - JOUR

T1 - Effects of the first heat up procedure on mechanical properties of solid oxide fuel cell sealing materials

AU - Rautanen, Markus

AU - Pulkkinen, Valtteri

AU - Tallgren, Johan

AU - Himanen, Olli

AU - Kiviaho, Jari

PY - 2015

Y1 - 2015

N2 - SOFC stack seals need to be correctly dimensioned to achieve a gas tight stack with low electrical contact resistances. Mechanical properties of SOFC stack sealing materials are presented for three assembly and first heat up procedures: applying full compressive stress at room temperature before first heat up (1), applying no compressive stress before first heat up and applying the full compressive stress at operating temperature (2), applying partial compressive stress at room temperature and full compressive stress at operating temperature after first heat up (3). The behaviour of the glass seal (Schott GM31107) is not affected significantly by compressive force during heat up. Compressibility of both compressible sealing material (Thermiculite CL87) and hybrid sealing material (Thermiculite CL87LS) was found to be about 40% (between 0.1 and 0.9 MPa) at room temperature but only about 4% (between 0.1 and 0.9 MPa) at 700 °C. Therefore it is beneficial to carry out as much of the compression as possible at room temperature before first heat up. This allows for maximum amount of deformability in the sealing materials resulting in the highest ability to compensate for stack manufacturing and assembly tolerances, which is needed to realize a gas tight stack with low electrical contact resistances.

AB - SOFC stack seals need to be correctly dimensioned to achieve a gas tight stack with low electrical contact resistances. Mechanical properties of SOFC stack sealing materials are presented for three assembly and first heat up procedures: applying full compressive stress at room temperature before first heat up (1), applying no compressive stress before first heat up and applying the full compressive stress at operating temperature (2), applying partial compressive stress at room temperature and full compressive stress at operating temperature after first heat up (3). The behaviour of the glass seal (Schott GM31107) is not affected significantly by compressive force during heat up. Compressibility of both compressible sealing material (Thermiculite CL87) and hybrid sealing material (Thermiculite CL87LS) was found to be about 40% (between 0.1 and 0.9 MPa) at room temperature but only about 4% (between 0.1 and 0.9 MPa) at 700 °C. Therefore it is beneficial to carry out as much of the compression as possible at room temperature before first heat up. This allows for maximum amount of deformability in the sealing materials resulting in the highest ability to compensate for stack manufacturing and assembly tolerances, which is needed to realize a gas tight stack with low electrical contact resistances.

KW - SOFC

KW - seal

KW - stack

KW - hybrid

KW - compression

KW - stress

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

U2 - 10.1016/j.jpowsour.2015.03.012

DO - 10.1016/j.jpowsour.2015.03.012

M3 - Article

VL - 284

SP - 511

EP - 516

JO - Journal of Power Sources

JF - Journal of Power Sources

SN - 0378-7753

ER -