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@INPROCEEDINGS{Grnwald:828422,
      author       = {Grünwald, Nikolas and Menzler, Norbert H. and Guillon,
                      Olivier and Vassen, Robert},
      title        = {{M}icrostructural {E}volution of {A}tmospheric {P}lasma
                      {S}prayed {M}anganese {C}obalt {I}ron {O}xide {P}rotection
                      {L}ayers for {S}olid {O}xide {F}uel {C}ells},
      reportid     = {FZJ-2017-02383},
      year         = {2017},
      abstract     = {In sold oxide fuel cells (SOFCs), chromium containing
                      steels are widely used as interconnect material. On the one
                      hand they fulfill the component’s demands, but on the
                      other hand chromium species that evaporate at the high SOFCs
                      working temperatures lead to a strong degradation of
                      commonly used cathode materials. This chromium poisoning can
                      be minimized by inserting a chromium protection layer
                      between interconnect and cathode. Atmospheric plasma sprayed
                      (APS) Mn1.0Co1.9Fe0.1O4 (MCF) protective coatings have
                      proven their effectiveness in reducing degradation rates
                      within operated stacks in Jülich. Previous studies revealed
                      phase and microstructural changes of these layers during
                      annealing in air but couldn’t explain the underlying
                      mechanisms, which are crucial for long term predictions.
                      This study investigates long term annealed samples and will
                      concentrate on the microstructural and phase changes,
                      enabling a lifetime prediction of APS-MCF coatings. A
                      self-healing of microcracks, which are present in as-sprayed
                      coatings, is observed after annealing at 500°C in air.
                      Diffraction patterns of the initial and annealed state
                      reveal a phase change linked to the annealing process,
                      explaining the healing effect by a volume expansion
                      connected to an oxygen uptake. Visualization of the
                      elemental distribution shows a demixing of cobalt and
                      manganese after annealing at 700°C that is described by a
                      simple model. Combining these results with those obtained
                      from long term operated stacks can allow lifetime
                      predictions of such protection layers.},
      month         = {Mar},
      date          = {2017-03-19},
      organization  = {92. DKG Jahrestagung $\&$ Symposium
                       Hochleistungskeramik 2017, Berlin
                       (Germany), 19 Mar 2017 - 22 Mar 2017},
      subtyp        = {After Call},
      cin          = {IEK-1 / JARA-ENERGY},
      cid          = {I:(DE-Juel1)IEK-1-20101013 / $I:(DE-82)080011_20140620$},
      pnm          = {135 - Fuel Cells (POF3-135) / SOFC - Solid Oxide Fuel Cell
                      (SOFC-20140602) / HITEC - Helmholtz Interdisciplinary
                      Doctoral Training in Energy and Climate Research (HITEC)
                      (HITEC-20170406)},
      pid          = {G:(DE-HGF)POF3-135 / G:(DE-Juel1)SOFC-20140602 /
                      G:(DE-Juel1)HITEC-20170406},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/828422},
}