TY - JOUR
T1 - Influence of porosity on mechanical properties of tetragonal stabilized zirconia
AU - Boccaccini, Dino
AU - Frandsen, Henrik Lund
AU - Soprani, Stefano
AU - Cannio, Maria
AU - Klemensø, Trine
AU - Gil, Vanesa
AU - Hendriksen, Peter Vang
PY - 2018
Y1 - 2018
N2 - 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.
AB - 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.
KW - Yttria stabilized zirconia
KW - Porosity
KW - Mechanical properties
KW - Anode supported solid oxide fuel cell
U2 - 10.1016/j.jeurceramsoc.2017.09.029
DO - 10.1016/j.jeurceramsoc.2017.09.029
M3 - Journal article
SN - 0955-2219
VL - 38
SP - 1720
EP - 1735
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
IS - 4
ER -