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@PHDTHESIS{Pecanac:133741,
      author       = {Pecanac, Goran},
      title        = {{T}hermo-mechanical {I}nvestigations and {P}redictions for
                      {O}xygen {T}ransport {M}embrane {M}aterials},
      volume       = {178},
      school       = {RWTH Aachen},
      type         = {Dr.},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {FZJ-2013-02140},
      isbn         = {978-3-89336-678-5},
      series       = {Schriften des Forschungszentrums Jülich Reihe Energie $\&$
                      Umwelt / Energy $\&$ Environment},
      pages        = {143 S.},
      year         = {2013},
      note         = {RWTH Aachen, Diss., 2013},
      abstract     = {One of the most efficient ways to realize an Oxy-fuel
                      process is the utilization of ceramic oxygen transport
                      membranes (OTMs) for air separation, since this process
                      provides a significantly lower efficiency loss compared to
                      conventional cryogenic separation technologies. Driven by
                      the difference in oxygen partial pressure, the oxygen
                      transport takes place via oxygen vacancies in the crystal
                      lattice of the membrane. Thin membrane layers supported by a
                      porous substrate are considered as the most efficient design
                      solution for such air separation units. The porous substrate
                      should provide mechanical stability of the entire membrane
                      structure. The operational temperatures are rather high,
                      since the release of oxygen atoms from the lattice at
                      elevated temperatures aids the transport processes. Due to
                      their favorable permeation properties, which are an
                      essential functional prerequisite, several materials were
                      suggested as promising membrane and substrate materials,
                      namely:
                      Ba$_{0.5}$Sr$_{0.5}$Co$_{0.8}$Fe$_{0.2}$O$_{3-\delta}$,
                      La$_{0.58}$Sr$_{0.4}$Co$_{0.2}$Fe$_{0.8}$O$_{3-\delta}$,
                      Ce$_{0.9}$Gd$_{0.1}$O$_{1.95-\delta}$ and as alternative
                      substrate material, the novel Fe21Cr7Al1Mo0.5Y alloy. The
                      current study aims at the thermo-mechanical characterization
                      and comparison of those materials. Fundamental mechanical
                      characteristics such as elastic behavior and fracture
                      properties were evaluated to warrant the long-term
                      functionality of these materials. However, the long-term
                      reliability of the component does not only depend on its
                      initial strength, but also on strength degradation effects.
                      In particular, the sensitivity to environmentally enhanced
                      crack propagation at subcritical stress levels was assessed
                      and also used as a basis for a strength–probability–time
                      lifetime prediction. Creep behavior and time to rupture were
                      characterized, since at operation relevant (elevated)
                      temperatures long-term failure may occur due to creep
                      damage. The mechanical limit of the thin membrane layer and
                      its effect on the stability of the substrate material was
                      also addressed. Complementary numerical simulations were
                      carried out to permit an assessment of the experimentally
                      obtained mechanical characteristics since standard
                      analytical relationships (ASTM C 1499) are limited to flat
                      mono-layer specimens. The mainly experimentally based work
                      was additionally supported by numerical simulations to
                      assess the effects of the final membrane´s geometrical
                      arrangement (i.e. tubular and planar) and thickness ratios
                      of particular layers, in order to optimize the membrane
                      design.},
      keywords     = {Dissertation (GND)},
      cin          = {IEK-2},
      cid          = {I:(DE-Juel1)IEK-2-20101013},
      pnm          = {122 - Power Plants (POF2-122)},
      pid          = {G:(DE-HGF)POF2-122},
      typ          = {PUB:(DE-HGF)11},
      url          = {https://juser.fz-juelich.de/record/133741},
}