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Abstract

In the frame of JET's ITER-like wall (ILW) project tungsten coatings on carbon fibre reinforced carbon substrates will be used in the divertor and highly loaded areas in the main chamber. Fourteen different types of samples were produced by physical or chemical vapour deposition and vacuum plasma spray (VPS) with coating thickness of 4, 10 and 200 mu m. Similarly, three different VPS W coatings (200 mu m) on two different graphite substrates, were produced for use at the strike-point regions of ASDEX Upgrade. All coatings were subjected to thermal screening and thermal cycling tests in the ion beam facility GLADIS. Additionally, the coatings intended for the ILW project were exposed to edge localized mode (ELM)-like thermal loads in the electron beam facility JUDITH. A general failure mode with the CFC substrate is crack formation upon cool-down, whereas the coatings on graphite do not show any crack formation. Additionally, metallographic investigations, x-ray diffraction measurements, adhesion testing as well as measurements on the contents of light impurities were performed.

Additional information

Authors: NEU R, Max-Planck-Institut für Plasmaphysik, IPP-EURATOM Association, Garching (DE);MAIER H, Max-Planck-Institut für Plasmaphysik, IPP-EURATOM Association, Garching (DE);GREUNER H, Max-Planck-Institut für Plasmaphysik, IPP-EURATOM Association, Garching (DE);HOPF CH, Max-Planck-Institut für Plasmaphysik, IPP-EURATOM Association, Garching (DE);GAUTHIER E, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);MITTEAU R, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);HIRAI T, Institut für Plasmaphysik, Forschungszentrum Jülich, Association EURATOM/FZJ, Trilateral Euregio Cluster, Jülich (DE);PHILIPPS V, Institut für Plasmaphysik, Forschungszentrum Jülich, Association EURATOM/FZJ, Trilateral Euregio Cluster, Jülich (DE);LIKONEN J, Association Euratom-TEKES, VTT (FI);MADDALUNO G, Associazione Euratom-ENEA sulla Fusione, Centro.Richerche Energia ENEA-Frascati, Frascati (IT);MATTHEWS G F, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);PIAZZA G, EFDA-Close Support Unit, Culham Science Centre, Abingdon (GB);RUSET C, National Insitute for Laser, Plasma and Radiation Physics, Association Euratom-MEdC, Bucharest (RO)
Bibliographic Reference: An article published in: Physica Scripta T128 (2007), pp. 150-156
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: http://dx.doi.org/10.1088/0031-8949/2007/T128/029
Record Number: 200719135 / Last updated on: 2007-04-11
Category: PUBLICATION
Original language: en
Available languages: en
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