This title appears in the Scientific Report :
2021
Tungsten Fibre Reinforced Tungsten (Wf /W) using Yarn Based Textile Preforms
Tungsten Fibre Reinforced Tungsten (Wf /W) using Yarn Based Textile Preforms
Tungsten Fibre Reinforced Tungsten (Wf/W) using Yarn Based Textile PreformsJ.W.Coenena,e,∗,P.Huberb, L.Raumanna, D.Schwalenberga,d, Y.Maoa, J.Rieschc,Ch.Linsmeiera, R.Neuc,da)Forschungszentrum J ̈ulich GmbH, Institut f ̈ur Energie- und Klimaforschung 52425J ̈ulich, Germany,b)Institut f ̈ur Textiltec...
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Personal Name(s): | Coenen, JW. (Corresponding author) |
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Huber, P. / Raumann, L. / Schwalenberg, D. / Mao, Y. / Riesch, J. / Linsmeier, Ch. / Neu, R. | |
Contributing Institute: |
Plasmaphysik; IEK-4 |
Imprint: |
2021
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Conference: | 24th International Conference on Plasma Surface Interactions in Controlled Fusion Devices (PSI 2020), virtuell (virtuell), 2021-01-25 - 2021-01-29 |
Document Type: |
Abstract |
Research Program: |
Plasma-Wand-Wechselwirkung |
Publikationsportal JuSER |
Tungsten Fibre Reinforced Tungsten (Wf/W) using Yarn Based Textile PreformsJ.W.Coenena,e,∗,P.Huberb, L.Raumanna, D.Schwalenberga,d, Y.Maoa, J.Rieschc,Ch.Linsmeiera, R.Neuc,da)Forschungszentrum J ̈ulich GmbH, Institut f ̈ur Energie- und Klimaforschung 52425J ̈ulich, Germany,b)Institut f ̈ur Textiltechnik (ITA) der RWTH Aachen University,Aachen, Germany,c)Max-Planck-Institut f ̈ur Plasmaphysik, 85748 Garching,Germany,d)Technische Universit ̈at M ̈unchen, 85748 Garching, Germany,e)Department of Engineering Physics, University of Wisconsin Madison, WI 53706Madison, USAMaterial issues pose a significant challenge for the design of future fusion reactors.Tungsten (W) is the main candidate material as it is resilient against erosion, has thehighest melting point of any metal and shows rather benign transmutations under neu-tron irradiation. However, W is intrinsically brittle and faces operational embrittlement.To overcome these issues new advanced materials are being developed. W-fibre re-inforced W-composite material (Wf/W) incorporates extrinsic toughening mechanismsallowing the redistribution of stress peaks and thus allowing steps towards applica-tion in a future fusion reactor. Recently progress has been made towards fully densemulti short-fibre powder metallurgical production of Wf/W [2] as well as optimising theprocess understanding for the routes using chemical deposition [3].In this contribution the recent status for the Wf/W production will be given with a focuson the introduction of advanced textile preforms produced from W-yarns [1]. In thepast, typically monofilamantes with a diameter of150μm(OSRAM) have been used toweave textile preforms to facilitate large scale production of e.g. for CVD-Wf/W [3].However, the high stiffness of the tungsten fibers with 150 um diameter oftenpresents some challenges, i.e. positioning of a flat preform during the CVD processes.Here less stiff16μmor25μmfibres can be used where the strength of the16μmfibresis at4500MPa[3] and thus significant higher than the strength of the150μmfibre.After the initial success in yarn production [1] a larger amount of yarns were indus-trially produced at Bossert&Kast and used for Weaving. The superior weavability ofthe yarn allows a much more flexible textile preform to be manufactured. Here threetypes of weaves are being compared, firstly of course the original monofilamant basedweave and then the yarn based options utilising first a classical50μmtungsten fila-ment in the weft direction and a second one utilising the identical yarn type in bothwarp and weft direction. Testing of these weaves in the CVD (Wf/W) production isessential to optimise density and fibre volume fraction.For the individual yarns already a dense infiltration is observed and needs nowto be established for the woven product. Modelling shows that utilising a yarn basedweave and thus making the layer placement more accurate, which is crucial to allowWf/W production with optimal density and mechanical properties.[1] Coenen J.W. et al.Physica Scripta, IOP, T171, 014061, (2020).[2] Mao, Y. et al.Composites Part A:,Elsevier BV, 2018, 107, 342-353.[3] Gietl, H. et al.Journal of Composite Materials, (2018), 002199831877114.∗Corresponding Author: tel +492461615536 e-mail j.w.coenen@fz-juelich.de |