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@ARTICLE{Grnwald:837607,
      author       = {Grünwald, Nikolas and Sebold, Doris and Sohn, Yoo Jung and
                      Menzler, Norbert H. and Vaßen, Robert},
      title        = {{S}elf-healing atmospheric plasma sprayed {M}n 1.0 {C}o 1.9
                      {F}e 0.1 {O} 4 protective interconnector coatings for solid
                      oxide fuel cells},
      journal      = {Journal of power sources},
      volume       = {363},
      issn         = {0378-7753},
      address      = {New York, NY [u.a.]},
      publisher    = {Elsevier},
      reportid     = {FZJ-2017-06486},
      pages        = {185 - 192},
      year         = {2017},
      abstract     = {Dense coatings on metallic interconnectors are necessary to
                      suppress chromium poisoning of SOFC cathodes.
                      Atmospherically plasma sprayed (APS) Mn1.0Co1.9Fe0.1O4 (MCF)
                      protective layers demonstrated reduced chromium related
                      degradation in laboratory and stack tests. Previous analyses
                      revealed strong microstructural changes comparing the
                      coating's as-sprayed and operated condition. This work
                      concentrates on the layer-densification and crack-healing
                      observed by annealing APS-MCF in air, which simulates the
                      cathode operation conditions. The effect is described by a
                      volume expansion induced by a phase transformation. Reducing
                      conditions during the spray process lead to a deposition of
                      the MCF in a metastable rock salt configuration. Annealing
                      in air activates diffusion processes for a phase
                      transformation to the low temperature stable spinel phase (T
                      < 1050 °C). This transformation is connected to an oxygen
                      incorporation which occurs at regions facing high oxygen
                      partial pressures, as there are the sample surface, cracks
                      and pore surfaces. Calculations reveal a volume expansion
                      induced by the oxygen uptake which seals the cracks and
                      densifies the coating. The process decelerates when the
                      cracks are closed, as the gas route is blocked and further
                      oxidation continues over solid state diffusion. The
                      self-healing abilities of metastable APS coatings could be
                      interesting for other applications.},
      cin          = {IEK-1},
      ddc          = {620},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      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)16},
      UT           = {WOS:000411544300023},
      doi          = {10.1016/j.jpowsour.2017.07.072},
      url          = {https://juser.fz-juelich.de/record/837607},
}