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@PHDTHESIS{Herzog:888731,
author = {Herzog, Simone},
othercontributors = {Broeckmann, Christoph and Bobzin, Kirsten},
title = {{F}estigkeit keramischer sauerstoffionenleitender
{M}embranen und deren reaktivgelöteter {V}erbunde},
school = {Rheinisch-Westfälische Technische Hochschule Aachen},
type = {Dissertation},
address = {Aachen},
publisher = {RWTH Aachen University},
reportid = {RWTH-2023-00770},
isbn = {978-3-8440-8956-1},
pages = {1 Online-Ressource : Illustrationen, Diagramme},
year = {2022},
note = {Veröffentlicht auf dem Publikationsserver der RWTH Aachen
University 2023; Dissertation, Rheinisch-Westfälische
Technische Hochschule Aachen, 2022},
abstract = {Oxygen separation from air by means of ceramic membrane
tubes requires gas-tight components that enable failure-free
permeation operation in the oxygen partial pressure gradient
at 850 °C. However, the test operation and observed
membrane failure in a pilot module raised questions, the
answers to which are of crucial importance for future module
developments and their operation. In this work, firstly, the
understanding of separate damage mechanisms of the membrane
material Ba0.5Sr0.5Co0.8Fe0.2O3-δ in long-term operation is
elaborated and then the associated strength degradation is
quantified. This is followed by the simulation of the
position- and time-dependent stress distribution during
operation and emergency shutdown. The results lead to a
re-evaluation of the cause of the damage, which allows the
derivation of constructive and process-side measures to
prevent membrane failure. The second part of the work
focuses current challenges of reactive brazing in air, which
have to be overcome in order to use membrane tubes reliably
and effectively without water cooling. This requires optimal
braze distribution, high joint strength and absence of
damage to the membrane in the as-brazed condition, as well
as little change in this condition during isothermal ageing.
The investigations carried out provide answers to the
fundamental question of which process parameters and
material combinations can be used to meet these
requirements.},
cin = {418110},
ddc = {620},
cid = {$I:(DE-82)418110_20140620$},
typ = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
doi = {10.18154/RWTH-2023-00770},
url = {https://publications.rwth-aachen.de/record/888731},
}
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