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FP7

Tungsten coatings for the JET ITER-like wall project

Funded under: FP7-EURATOM

Abstract

In the frame of JET�s ITER-like wall project for most of the divertor surface tungsten coatings are intended to be employed on bidirectionally carbon fibre reinforced carbon substrates. Since this is thermomechanically rather mis-matched, a variety of deposition conditions were considered. Mostly in cooperation with industry, five Euratom associations provided 14 different types of samples with respect to production method and coating thickness. In a step-wise selection procedure, these were subjected to a thermal screening test and a thermal cycling test in the ion beam facility GLADIS as well as to an ELM-like thermal shock test in the electron beam facility JUDITH. A general failure mode is crack formation upon cool-down. Coatings with several microns of thickness show a distinct delamination feature in addition. Further analysis included metallographic investigation, X-ray diffraction for film stress assessment, adhesion testing as well as measurements on the contents of light impurities.

Additional information

Authors: MAIER H, Max-Planck-Institut für Plasmaphysik, IPP-EURATOM Association, Garching (DE);NEU R, 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);MATTHEWS G F, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);COUNSELL G, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);PIAZZA G, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);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);COURTOIS X, 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);GAUTHIER E, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);LIKONEN J, Association EURATOM-TEKES, Helsinki University of Technology (FI);MADDALUNO G, Associazione Euratom-ENEA sulla Fusione, Centro.Richerche Energia ENEA-Frascati, Frascati (IT);RICCARDI B, Associazione Euratom-ENEA sulla Fusione, Centro.Richerche Energia ENEA-Frascati, Frascati (IT);RUSET C, National Institute for Laser, Plasma and Radiation Physics, Association EURATOM�MEdC, Bucharest (RO)
Bibliographic Reference: An article published in: Journal of Nuclear Materials, Volumes 363-365 (2007), pp. 1246-1250
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: http://dx.doi.org/doi:10.1016/j.jnucmat.2007.01.246
Record Number: 200719349 / Last updated on: 2007-09-06
Category: PUBLICATION
Original language: en
Available languages: en