Tungsten coatings for the JET ITER-like wall projectFunded under: FP7-EURATOM
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.
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
Original language: en
Available languages: en