TY - JOUR
T1 - Double Torsion testing of thin porous zirconia supports for energy applications: Toughness and slow crack growth assessment
AU - Khajavi, Peyman
AU - Chevalier, Jérôme
AU - Hendriksen, Peter Vang
AU - Tavacoli, Joe
AU - Gremillard, Laurent
AU - Frandsen, Henrik Lund
PY - 2020
Y1 - 2020
N2 - Thin, porous zirconia-based ceramic components are of high interest in energy application devices where they are used as structural ceramics. Mechanical reliability of such devices is not only dependent on the fracture toughness of the ceramic components, but also on their sensitivity to slow crack growth (SCG). In this work, the fracture toughness and SCG behavior of porous (4.5–45.5%) and thin (∼ 0.25 mm) 3Y-TZP ceramics are investigated using the Double Torsion method. The analysis of the double torsion data, previously developed for dense materials, was here assessed and adapted. The compliance of the samples was observed to change linearly with crack length and the measured stress intensity factor was dependent on crack length, as for dense materials. This dependency decreased by increasing the sample porosity. For all materials, the ratio of the SCG threshold to fracture toughness was of 0.56 ± 0.06.
AB - Thin, porous zirconia-based ceramic components are of high interest in energy application devices where they are used as structural ceramics. Mechanical reliability of such devices is not only dependent on the fracture toughness of the ceramic components, but also on their sensitivity to slow crack growth (SCG). In this work, the fracture toughness and SCG behavior of porous (4.5–45.5%) and thin (∼ 0.25 mm) 3Y-TZP ceramics are investigated using the Double Torsion method. The analysis of the double torsion data, previously developed for dense materials, was here assessed and adapted. The compliance of the samples was observed to change linearly with crack length and the measured stress intensity factor was dependent on crack length, as for dense materials. This dependency decreased by increasing the sample porosity. For all materials, the ratio of the SCG threshold to fracture toughness was of 0.56 ± 0.06.
KW - Slow crack growth
KW - Porosity
KW - Double torsion
KW - Solid oxide cells
KW - Energy applications
U2 - 10.1016/j.jeurceramsoc.2020.02.019
DO - 10.1016/j.jeurceramsoc.2020.02.019
M3 - Journal article
SN - 0955-2219
VL - 40
SP - 3191
EP - 3199
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
IS - 8
ER -