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@INPROCEEDINGS{SchulzeKppers:255571,
      author       = {Schulze-Küppers, Falk and Niehoff, Patrick and Guillon,
                      Olivier and Baumann, Stefan and Meulenberg, Wilhelm Albert
                      and Kiebach, Ragnar and Sogaard, Martin and Hendriksen,
                      Peter Vang and Kiesel, Lutz and Ritter, Katrin and Kriegel,
                      Ralf and Pippardt, Ute},
      title        = {{J}oining and sealing technologies for asymmetric
                      {B}a0.5{S}r0.5({C}o0.2{F}e0.8)0.97{Z}r0.03 {O}3-δ
                      ({BSCF}-{Z}r) membranes for {O}xy {C}ombustion processes},
      reportid     = {FZJ-2015-05712},
      year         = {2015},
      abstract     = {Oxy combustion processes attracted great interest due to
                      their potential role in decarbonisation of industrial
                      processes. A key role plays the energy and cost efficient
                      supply of pure oxygen. Ceramic oxygen transport membranes
                      (OTM) are a promising alternative to the state-of-the-art
                      separation processes. Mixed ionic-electronic conducting
                      membranes (MIECs) are of interest due to their ability to
                      transport oxygen via vacancies in the crystal lattice,
                      resulting in a theoretical oxygen selectivity of $100\%.$
                      One promising option is the high flux material
                      Ba0.5Sr0.5Co0.2Fe0.8O3-δ (BSCF) stabilized with 3 $mol\%$
                      Zr on the B-site in order to suppress the formation of the
                      undesired hexagonal polymorph. The resulting
                      Ba0.5Sr0.5(Co0.2Fe0.8)0.97Zr0.03O3-δ (BSCF-Zr) can be
                      operated in a 3-End mode, in which the feed air is
                      compressed and the permeated oxygen is removed by a vacuum.
                      In order to maximize the oxygen flux, the membrane was
                      designed as thin film membrane consisting of a porous
                      support and a thin membrane layer (~20 µm). This
                      microstructure and the pressure difference at high
                      application temperatures of about 850 °C impose challenging
                      requirements for a gas tight sealing (e.g. dead end of the
                      tube) and joining to the adjacent metallic components of the
                      module. To solve these challenges, the following
                      sealing/joining options were investigated:i) Reactive air
                      brazing (RAB) with a silver/copper oxide brazeii) Metallic
                      solder based on pure silveriii) Fully ceramic joining by
                      garnishing techniqueWhile the high reactivity of RAB brazes
                      is advantageous for monolithic BSCF tubes, the wettability
                      causes problems for supported thin film membranes. The
                      active element, i.e. copper oxide, tends to destroy the thin
                      membrane layer and the high wettability leads to heavy
                      infiltration into the support, causing failure of the entire
                      component. A successful strategy to avoid the infiltration
                      of the porous support and to ensure chemical compatibility
                      the joining with pure silver via a liquid phase bonding was
                      investigated. The green density of the brazing material was
                      increased compared to standard pastes by the fabrication of
                      silver foils by tape casting, sintering of the foil and a
                      subsequent compression step in order to avoid pores or voids
                      in the joining zone. Joining was performed at 960 °C (±5
                      °C). The plastic deformation of the thin metallic silver
                      foil can partly buffer a mismatch in thermal expansion.
                      Finally, a fully ceramic sealing procedure was developed.
                      For this purpose thin (~100 µm) ceramic tapes from BSCF-Zr
                      were fabricated via tape casting and placed between the
                      components to be joint. By a load assisted sintering, a gas
                      tight sealing could be achieved.Suitable for two ceramic
                      joining partners is the garnishing technique as well as the
                      use of silver solders. For ceramic-to-metal joining, the use
                      of silver solder shows the most promising results.},
      month         = {Sep},
      date          = {2015-09-06},
      organization  = {Euromembrane 2015, Aachen (Germany), 6
                       Sep 2015 - 10 Sep 2015},
      subtyp        = {After Call},
      cin          = {IEK-1 / JARA-ENERGY},
      cid          = {I:(DE-Juel1)IEK-1-20101013 / $I:(DE-82)080011_20140620$},
      pnm          = {113 - Methods and Concepts for Material Development
                      (POF3-113) / HETMOC - Highly Efficient Tubular Membranes for
                      Oxy-Combustion (268165) / GREEN-CC - Graded Membranes for
                      Energy Efficient New Generation Carbon Capture Process
                      (608524) / HITEC - Helmholtz Interdisciplinary Doctoral
                      Training in Energy and Climate Research (HITEC)
                      (HITEC-20170406)},
      pid          = {G:(DE-HGF)POF3-113 / G:(EU-Grant)268165 /
                      G:(EU-Grant)608524 / G:(DE-Juel1)HITEC-20170406},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/255571},
}