TY  - JOUR
AU  - Zeng, Fanlin
AU  - Malzbender, Jürgen
AU  - Baumann, Stefan
AU  - Nijmeijer, Arian
AU  - Winnubst, Louis
AU  - Guillon, Olivier
AU  - Schwaiger, Ruth
AU  - Meulenberg, Wilhelm A.
TI  - Residual stress and mechanical strength of Ce0.8Gd0.2O2--FeCo2O4 dual phase oxygen transport membranes
JO  - Journal of the European Ceramic Society
VL  - 41
IS  - 13
SN  - 0955-2219
CY  - Amsterdam [u.a.]
PB  - Elsevier Science
M1  - FZJ-2021-03197
SP  - 6539 - 6547
PY  - 2021
AB  - Ce0.8Gd0.2O2-δ-FeCo2O4 membranes, benefiting from their excellent chemical stability, exhibit a broad application potential in oxygen-consuming industrial processes running in harsh environments. For long-term reliable operation, the membrane needs to possess sufficient mechanical strength. This paper characterizes the typical aspects that challenge the mechanical stability of the sintered membrane, including composition and microstructural defects as well as residual stress and residual stress gradients. It is revealed that mechanical strengths of the sintered membranes increase with decreasing iron cobalt spinel content, that the high iron cobalt spinel content induces microcracks, and that high residual tensile stress gradually decreases from the as-sintered surface to the bulk. Although the residual tensile stress can be reduced by applying an extensive elevated temperature dwell time during cooling, it is suggested to limit the iron cobalt spinel content to a nominal value of 15 wt% to eliminate the residual tensile stress while maintaining a high mechanical strength.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000683469000001
DO  - DOI:10.1016/j.jeurceramsoc.2021.06.040
UR  - https://juser.fz-juelich.de/record/894362
ER  -