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Journal of Materials Science

, Volume 42, Issue 15, pp 6297–6301 | Cite as

Symmetric shear test of glass-ceramic sealants at SOFC operation temperature

  • Jürgen MalzbenderEmail author
  • Josef Mönch
  • Rolf W. Steinbrech
  • Thomas Koppitz
  • Sonja M. Gross
  • Josef Remmel
Article

Abstract

Glass-ceramics of the BaO–CaO–Al2O3–SiO2 system are frequently used in planar solid oxide fuel cells (SOFC) stacks to seal the fuel and air compartments and to join non-conductively the individual components. Due to the thermal mismatch of the ceramic and metallic materials in the stack, the seals experience predominantly shear stresses. A symmetric shear test has been developed to characterize the critical shear stress of the glass-ceramic at SOFC operation temperature. Specimens representative for the seal situation in an SOFC stack were prepared, using the glass-ceramic to join a center piece of a NiO-YSZ anode covered by yttria-stabilized zirconia (YSZ) electrolyte layers on both surfaces between two Crofer22APU interconnect steel blocks. Shear stress and based on a rheological model, shear modulus and viscosity of the sealant were determined. The investigations showed that the sealant exhibits viscous shear deformation at 800 °C, a temperature typical for SOFC operation. The influence of increasing crystallization on the shear deformation is demonstrated.

Keywords

Shear Modulus Shear Deformation Solid Oxide Fuel Cell Rheological Model Critical Shear Stress 

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • Jürgen Malzbender
    • 1
    Email author
  • Josef Mönch
    • 1
  • Rolf W. Steinbrech
    • 1
  • Thomas Koppitz
    • 2
  • Sonja M. Gross
    • 2
  • Josef Remmel
    • 2
  1. 1.Research Centre Jülich (FZJ)Institute for Materials and Processes in Energy SystemsJulichGermany
  2. 2.Research Centre Jülich (FZJ)Central Department of TechnologyJulichGermany

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