Journal
JOURNAL OF NUCLEAR MATERIALS
Volume 363, Issue -, Pages 1246-1250Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnucmat.2007.01.246
Keywords
coating; divertor material; electron beam; JET; tungsten
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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 mismatched, 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. (c) 2007 Elsevier B.V. All rights reserved.
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