Tungsten coatings for the JET ITER-like wall project

JOURNAL OF NUCLEAR MATERIALS

卷:363

Article; Proceedings Paper

Maier, H. ; Neu, R. ; Greuner, H. ; Hopf, Ch. ; Matthews, G. F. ; Piazza, G. ; Hirai, T. ; Counsell, G. ; Courtois, X. ; Mitteau, R. ; Gauthier, E. ; Likonen, J. ; Maddaluno, G. ; Philipps, V. ; Riccardi, B. ; Ruset, C.

关键词: coating;    divertor material;    electron beam;    JET;    tungsten;   

DOI  :  10.1016/j.jnucmat.2007.01.246

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

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