Journal article
Influence of porosity on mechanical properties of tetragonal stabilized zirconia
Department of Energy Conversion and Storage, Technical University of Denmark1
Mixed Conductors, Department of Energy Conversion and Storage, Technical University of Denmark2
Università degli Studi di Modena e Reggio Emilia3
Ceramic Engineering & Science, Department of Energy Conversion and Storage, Technical University of Denmark4
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 ∼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.
Language: | English |
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Year: | 2018 |
Pages: | 1720-1735 |
ISSN: | 1873619x and 09552219 |
Types: | Journal article |
DOI: | 10.1016/j.jeurceramsoc.2017.09.029 |
ORCIDs: | Frandsen, Henrik Lund , Gil, Vanesa and Hendriksen, Peter Vang |