- Authors:
-
- Pihlatie, Mikko ;
-
Kaiser, Andreas
;
Close
0000-0001-9873-3015
Risø National Laboratory for Sustainable Energy, Technical University of Denmark -
Mogensen, Mogens Bjerg
Close0000-0002-0902-0580
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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