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@ARTICLE{Coenen:878796,
      author       = {Coenen, J. W. and Treitz, M. and Gietl, H. and Huber, P.
                      and Hoeschen, T. and Raumann, L. and Schwalenberg, D. and
                      Mao, Y. and Riesch, J. and Terra, A. and Broeckmann, Ch and
                      Guillon, O. and Linsmeier, Ch and Neu, R.},
      title        = {{T}he use of tungsten yarns in the production for {W} f
                      /{W}},
      journal      = {Physica scripta},
      volume       = {T171},
      issn         = {1402-4896},
      address      = {Stockholm},
      publisher    = {The Royal Swedish Academy of Sciences},
      reportid     = {FZJ-2020-03049},
      pages        = {014061 -},
      year         = {2020},
      abstract     = {Material issues pose a significant challenge for the design
                      of future fusion reactors. Recently progress has been made
                      towards fully dense multi short-fibre powder metallurgical
                      production of tungsten-fibre reinforced tungsten (Wf /W) as
                      well as optimizing the process understanding for the routes
                      using chemical vapour deposition (CVD). For CVD-Wf /W weaves
                      and textile preforms are being used to facilitate large
                      scale production. Classically 150 μm tungsten fibres
                      supplied by OSRAM GmbH have been used. In order to
                      facilitate the better use of textile processes less stiff 16
                      μm filaments are being evaluated. The strength of the 16
                      μm filament is at 4500 MPa and thus significantly higher
                      than the strength of the 150 μm fibre (~2500 MPa) (in the
                      as-fabricated state). Better weavability allows a more
                      flexible use of fibre preforms Two main yarn production
                      routes have been investigated: covered yarns where a set of
                      tungsten filaments is held together by a PVA (Polyvinyl
                      alcohol) cover and braided yarns. In order to allow a
                      comparison to the previously used single fibres, yarns with
                      ~140 μm effective diameter were produced. Braided yarns
                      with tensile strength of 2500 MPa and $6\%$ strain at
                      fracture and twisted yarns with tensile strength of 4500 MPa
                      and $3\%$ strain at fracture. For both yarns single fibre
                      CVD samples have been produced to investigate the
                      infiltration properties of the yarns and thus their
                      applicability for the CVD route. A dense infiltration is
                      observed for all yarns under investigation},
      cin          = {IEK-4},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IEK-4-20101013},
      pnm          = {113 - Methods and Concepts for Material Development
                      (POF3-113)},
      pid          = {G:(DE-HGF)POF3-113},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000520000600061},
      doi          = {10.1088/1402-4896/ab6096},
      url          = {https://juser.fz-juelich.de/record/878796},
}