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@ARTICLE{Riesch:834313,
      author       = {Riesch, J. and Aumann, M. and Coenen, J. W. and Gietl, H.
                      and Holzner, G. and Höschen, T. and Huber, P. and Li, M.
                      and Linsmeier, Ch. and Neu, R.},
      title        = {{C}hemically deposited tungsten fibre-reinforced tungsten
                      – {T}he way to a mock-up for divertor applications},
      journal      = {Nuclear materials and energy},
      volume       = {9},
      issn         = {2352-1791},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier},
      reportid     = {FZJ-2017-04292},
      pages        = {75 - 83},
      year         = {2016},
      abstract     = {The development of advanced materials is essential for
                      sophisticated energy systems like a future fusion reactor.
                      Tungsten fibre-reinforced tungsten composites (Wf/W) utilize
                      extrinsic toughening mechanisms and therefore overcome the
                      intrinsic brittleness of tungsten at low temperature and its
                      sensitivity to operational embrittlement. This material has
                      been successfully produced and tested during the last years
                      and the focus is now put on the technological realisation
                      for the use in plasma facing components of fusion devices.
                      In this contribution, we present a way to utilize Wf/W
                      composites for divertor applications by a fabrication route
                      based on the chemical vapour deposition (CVD) of tungsten.
                      Mock-ups based on the ITER typical design can be realized by
                      the implementation of Wf/W tiles. A concept based on a
                      layered deposition approach allows the production of such
                      tiles in the required geometry. One fibre layer after the
                      other is positioned and ingrown into the W-matrix until the
                      final sample size is reached. Charpy impact tests on these
                      samples showed an increased fracture energy mainly due to
                      the ductile deformation of the tungsten fibres. The use of
                      Wf/W could broaden the operation temperature window of
                      tungsten significantly and mitigate problems of deep
                      cracking occurring typically in cyclic high heat flux
                      loading. Textile techniques are utilized to optimise the
                      tungsten wire positioning and process speed of preform
                      production. A new device dedicated to the chemical
                      deposition of W enhances significantly, the available
                      machine time for processing and optimisation. Modelling
                      shows that good deposition results are achievable by the use
                      of a convectional flow and a directed temperature profile in
                      an infiltration process.},
      cin          = {IEK-4},
      ddc          = {333.7},
      cid          = {I:(DE-Juel1)IEK-4-20101013},
      pnm          = {113 - Methods and Concepts for Material Development
                      (POF3-113) / HITEC - Helmholtz Interdisciplinary Doctoral
                      Training in Energy and Climate Research (HITEC)
                      (HITEC-20170406)},
      pid          = {G:(DE-HGF)POF3-113 / G:(DE-Juel1)HITEC-20170406},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000391191500012},
      doi          = {10.1016/j.nme.2016.03.005},
      url          = {https://juser.fz-juelich.de/record/834313},
}