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Estimation of carbon fibre composites as ITER divertor armour

Pestchanyi, S. 1; Safronov, V.; Landman, I. 1
1 Forschungszentrum Karlsruhe (FZKA)


Carbon fibre composites (CFC) of NB31 and NS31 grades developed for the divertor armour of the future tokamak ITER have shown a high thermal conductivity and a low erosion rate appropriate for the tokamak stationary regimes with characteristic temperatures of 1000-2000 K. However, for the expected slow transient loads of 20 MW/m2 simulation experiments of Bonal et al on electron beam facilities demonstrated high erosion rates of NB31 in the temperature range of 3000 - 3500 K. At such temperatures, brittle destruction erosion of fine grain graphite armour is much smaller. As demonstrated by numerical simulations for NB31 with the Pegasus-3D code, the high erosion rate of NB31 is due to the new erosion mechanism. The local overheating erosion mechanism (LOEM) exists in rather complex structure of CFC, consists of fibre framework and carbon matrix. The discovered LOEM is due to the preferential cracking on the fibre surface and thermal isolation of the fibres parallel to the armour surface from matrix. A large difference of fibre and matrix coefficients of thermal expansion is essential for LOEM. At the QSPA facility in TRINITI, new experiments simulating ITER type I ELMs heat load are performed. ... mehr

DOI: 10.1016/j.jnucmat.2004.04.189
Zitationen: 24
Zitationen: 21
Zugehörige Institution(en) am KIT Institut für Hochleistungsimpuls- und Mikrowellentechnik (IHM)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2004
Sprache Englisch
Identifikator ISSN: 0022-3115, 1873-4820
KITopen-ID: 110054625
HGF-Programm 31.02.03 (POF I, LK 01)
Erschienen in Journal of nuclear materials
Verlag Elsevier
Band 329-333
Heft A
Seiten 697-701
Bemerkung zur Veröffentlichung 11th International Conference on Fusion Reactor Materials (ICFRM-11), Kyoto, Japan, 7th - 12th December 2003
Nachgewiesen in Dimensions
Web of Science
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