Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 38, Issue 4, Pages 1720-1735Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2017.09.029
Keywords
Yttria stabilized zirconia; Porosity; Mechanical properties; Anode supported solid oxide fuel cell
Categories
Funding
- DTU Department of Energy Conversion and Storage
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3YSZ specimens with variable open porosity (1-57%) were fabricated, and the stiffness, strength and fracture properties (fracture toughness and R-curve) were measured to investigate their potential use as support structures for solid oxide fuel or electrolysis cells. The ball-on-ring test was used to characterize Young's modulus and Weibull strength. The variation of fracture toughness with porosity was investigated and modelled using the results from fracture mechanical testing. A distinct R-curve behaviour was observed in dense 3YSZ specimens, in samples with a porosity around 15% and in some of the highly porous samples (porosities similar to 45%) reflecting a transformation toughening in the material. For the most porous samples, the R-curve behaviour disappeared and subcritical crack growth was observed. The studies indicate that even highly porous 3YSZ structures (porosities exceeding 40%) are feasible supports for SOFC/SOECs from a mechanical point of view.
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