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@PHDTHESIS{Vieweger:139928,
      author       = {Vieweger, Sebastian Dieter},
      title        = {{E}ntwicklung und {H}erstellung von metallgestützten
                      {F}estelektrolyt-{B}rennstoffzellen ({MSC}-{SOFC}) mit einem
                      {S}ol-{G}el-{E}lektrolyten},
      volume       = {189},
      school       = {Universität Bochum},
      type         = {Dissertation},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH, Zentralbibliothek, Verlag},
      reportid     = {FZJ-2013-05897},
      isbn         = {978-3-89336-904-1},
      series       = {Schriften des Forschungszentrums Jülich Reihe Energie $\&$
                      Umwelt / Energy $\&$ Environment},
      pages        = {176 S.},
      year         = {2013},
      note         = {Dissertation, Universität Bochum, 2013},
      abstract     = {Fuel Cells are giving the opportunity to convert electric
                      energy from fuels like hydrogen or natural gas with high
                      efficiency. The Forschungszentrum Jülich GmbH and in
                      particular the Institute for Energy and Climate Research,
                      Materials Synthesis and Processing (IEK-1) have been working
                      in the field of fuel cells for the last twenty years. A
                      focus of the recent studies is the expansion of the fuel
                      cell deployability to new market segments from stationary to
                      mobile applications like auxiliary power units. In case of
                      mobile application metal-supported solid oxide fuel cells
                      are promising a high potential in comparison to anode
                      supported ceramic fuel cells. Metal-supported solid oxide
                      fuel cells are showing a higher stability against vibration,
                      mechanical loads and rapid thermal cycling, which are
                      boundary conditions to mobile applications. Metal-supported
                      solid oxide fuel cells put high requirements on methods
                      engineering and materials used during the processing steps
                      such as thermal treatments in reducing atmosphere to protect
                      the substrate and the anode against oxidation. Moreover such
                      cells have also a rougher surface with large defects inside
                      in comparison toanode supported ceramic fuel cells. This
                      makes the deposition of thin layers a challenge and
                      innovative solutions must be found to deal with it. The
                      present work is concerned with the manufacturing of
                      electrolyte layers in the range of a few micrometers on top
                      of a metal-supported cell. The metallic support used in this
                      work, made of a ferritic ODS (oxide dispersion strengthened)
                      Fe-Cr alloy (ITM: Fe-26Cr-(Mo, Ti, Y2O3)), has a low
                      shrinkage below 1 $\%$ at 1380 °C in reducing atmosphere,
                      which inhibitsthe densification of the electrolyte. For that
                      reason a sol-gel-electrolyte layer system, which showed
                      first good results with anode supported systems was
                      transferred to the metallic supported system. By modifying
                      the setup of the layer system and the methods engineering, a
                      graded electrolyte in the range of ~ 2 $\mu$m could be
                      reproducibly established on top of the anode layer. The
                      characterized densities of the electrolytes were by a factor
                      of 2-4 times lower compared to the postulated density. Two
                      different kinds of fabrication routes, using a graded screen
                      printed anode layer system and a tape cast anode layer were
                      investigated in order to deposit an anode layer on top of
                      the porous metallic support. It could be shown that on both
                      systems a sol gel electrolyte could be deposited in
                      combination with a screen printed or vacuum slip casted 8YSZ
                      adaptation layer. Further investigations including roughness
                      parameters and a non-destructive measurement method are done
                      and evaluated to characterize the subsurface, on which the
                      electrolyte was deposited. With the non-contact and
                      non-destructive measurement method it is possible to
                      identify and characterize defects like pores and especially
                      the boundaries of the defects in a subsurface. By using
                      analysis-software the detected boundaries and defects could
                      bequantified and analyzed in terms of their geometry and
                      their surface in proportion to the scan surface. The
                      non-destructive characterization method could be transferred
                      and evaluated to different surfaces which are important to
                      the anode supported ceramic fuel cell and metalsupported
                      solid oxide fuel cell technology. The main focus of this
                      work is the coating of thin and gas tight 8YSZ electrolyte
                      layers by sol-gel technology on coarse porous metallic
                      substrates and the developing and evaluating ofa
                      non-destructive method to characterize defects and
                      especially the boundaries of defects in the subsurface,
                      which has to be coated.},
      keywords     = {Dissertation (GND)},
      cin          = {IEK-1},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {123 - Fuel Cells (POF2-123)},
      pid          = {G:(DE-HGF)POF2-123},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
      url          = {https://juser.fz-juelich.de/record/139928},
}