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@ARTICLE{Sietmann:892731,
      author       = {Sietmann, Michael and Janßen, Holger and Müller, Martin
                      and Lehnert, Werner},
      title        = {{A}n analysis of the imperfections and defects inside
                      composite bipolar plates using {X}-{R}ay computer tomography
                      and resistivity simulations},
      journal      = {International journal of hydrogen energy},
      volume       = {46},
      number       = {50},
      issn         = {0360-3199},
      address      = {New York, NY [u.a.]},
      publisher    = {Elsevier},
      reportid     = {FZJ-2021-02292},
      pages        = {25677-25688},
      year         = {2021},
      abstract     = {With the increasing mass production, the quality control of
                      bipolar plates (BPPs) becomes more important. A
                      classification and understanding of imperfections and
                      defects is necessary for the design of quality assurance
                      measures within the manufacturing process. In this paper, a
                      combined X-Ray computer tomography (CT) and resistivity
                      simulation approach is used to investigate graphite
                      composite BPPs. With this non-destructive approach, the
                      morphology and composition of a detailed BPP section, as
                      well as an entire flow field, can be analyzed for its
                      characteristics and defects. The different detected
                      imperfections occurring in injection-molded and
                      compression-molded BPP samples include cracks, air bubbles
                      and agglomerations of voids and foreign particles. The
                      investigated flow field geometry has a major impact and
                      increases the electrical resistance by about $19\%$ compared
                      to a bulk material body. The investigated imperfections
                      inside the BPP material have a minimal impact on the
                      electrical resistance of the BPP.},
      cin          = {IEK-14},
      ddc          = {620},
      cid          = {I:(DE-Juel1)IEK-14-20191129},
      pnm          = {1231 - Electrochemistry for Hydrogen (POF4-123)},
      pid          = {G:(DE-HGF)POF4-1231},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000675512000013},
      doi          = {10.1016/j.ijhydene.2021.05.078},
      url          = {https://juser.fz-juelich.de/record/892731},
}