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@INPROCEEDINGS{Raumann:856609,
      author       = {Raumann, L. and Coenen, J. W. and Riesch, J. and Mao, Y.
                      and Gietl, H. and Höschen, T. and Linsmeier, Ch. and
                      Guillon, O.},
      title        = {{M}odelling of chemical vapor deposition to improve
                      tungsten fiber reinforced tungsten composites ({W}f/{W})},
      reportid     = {FZJ-2018-05977},
      year         = {2018},
      abstract     = {DPG – AbstractTitle: Modelling of chemical vapor
                      deposition to improve tungsten fiber reinforced tungsten
                      composites (Wf/W) Authors:L. Raumann1,2, J.W. Coenen1, J.
                      Riesch3, Y. Mao1,2, H. Gietl3,4, T. Höschen3, Ch.
                      Linsmeier1, O. Guillon1,21Institut für Energie und
                      Klimaforschung – Forschungszentrum Jülich GmbH, 52425
                      Jülich2Rheinisch-Westfälische Technische Hochschule
                      Aachen, 52062 Aachen3Max-Planck-Institut für Plasmaphysik,
                      85748 Garching b. München4Technische Universität München,
                      85748 GarchingAbstract (< 200 words):Due to the unique
                      combination of excellent thermal properties, low sputter
                      yield, hydrogen retention and activation, tungsten is the
                      main candidate for the first wall material in future fusion
                      devices. However, its intrinsic brittleness and its
                      susceptibility to operational embrittlement is a major
                      concern. To overcome this drawback, tungsten fiber
                      reinforced tungsten composites featuring pseudo ductility
                      have been developed. Bulk material can be successfully
                      produced utilizing chemical vapor deposition of tungsten
                      fabrics. However, a fully dense composite with a high fiber
                      volume fraction is still a huge challenge. Therefore, a
                      model is currently developed in COMSOL including the complex
                      coupling of transport phenomena and chemical reaction
                      kinetics. To validate the model with experimental data,
                      fibers were deposited in heated tubes under controlled
                      parameter variation. The temperature and tungsten growth
                      rate were measured along the fibers and inner tube surfaces
                      for different heater temperatures, partial pressures and gas
                      flows. With the experimental results the prediction of the
                      model has been improved. As next step the model will be
                      applied to design infiltration experiments to fabricate
                      fully dense Wf/W composites with a high fiber volume
                      fraction.},
      month         = {Mar},
      date          = {2018-03-04},
      organization  = {82. Jahrestagung der DPG und
                       DPG-Frühjahrstagung der Sektion AMOP,
                       Erlangen (Germany), 4 Mar 2018 - 9 Mar
                       2018},
      cin          = {IEK-4 / IEK-1},
      cid          = {I:(DE-Juel1)IEK-4-20101013 / I:(DE-Juel1)IEK-1-20101013},
      pnm          = {113 - Methods and Concepts for Material Development
                      (POF3-113)},
      pid          = {G:(DE-HGF)POF3-113},
      typ          = {PUB:(DE-HGF)1},
      url          = {https://juser.fz-juelich.de/record/856609},
}