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Mechanical properties of NiO/Ni-YSZ composites depending on temperature, porosity and redox cycling

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Authors:
  • Pihlatie, Mikko ;
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    Risø National Laboratory for Sustainable Energy, Technical University of Denmark
  • Kaiser, Andreas ;
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    Orcid logo0000-0001-9873-3015
    Risø National Laboratory for Sustainable Energy, Technical University of Denmark
  • Mogensen, Mogens Bjerg
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    Orcid logo0000-0002-0902-0580
    Risø National Laboratory for Sustainable Energy, Technical University of Denmark
DOI:
10.1016/j.jeurceramsoc.2008.10.017
Abstract:
The Impulse Excitation Technique (IET) was used to determine the elastic modulus and specific damping of different Ni/NiO-YSZ composites suitable for use in solid oxide fuel cells (SOFC). The porosity of the as-sintered samples varied from 9 to 38% and that of the reduced ones from 31 to 52%. For all samples a linear relation between Young's modulus and porosity was found. The temperature dependency of the mechanical properties of both as-sintered and reduced composites was investigated by IET up to 1200 degrees C. In the as-sintered state, first an increase and peak of stiffness coinciding with the Neel temperature, 250 degrees C, of NiO was observed. Above this temperature, a linear decrease occurred. Specific damping showed a peak at 170-180 degrees C and increased above ca. 1000 degrees C in NiO-YSZ. In the reduced state the elastic modulus decreased linearly with temperature; specific damping increased above ca. 600 degrees C and was found to be very dependent on microstructure. Damage caused by redox cycling degraded the elastic properties of the composites. Degradation started linearly from 0.5 to 0.6% redox strain leading to macroscopic sample failures at about 2.5% dL/L-o. A simple continuum elastic damage model was fitted to the degradation data. (C) 2008 Elsevier Ltd. All rights reserved.
Type:
Journal article
Language:
English
Published in:
Journal of the European Ceramic Society, 2009, Vol 29, Issue 9, p. 1657-1664
Keywords:
Fuel Cells and hydrogen; Ceramic Membranes; Brændselsceller og brint; Membraner
Main Research Area:
Science/technology
Submission year:
2009
ID:
2383868

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