Ceramic matrix composites based on SiC with continuous fibres (SiCf/SiC) are considered promising structural materials for future fusion devices. It was still to clarify, whether impurities in industrial SiCf/SiC could jeopardise radiological advantages. Experimental impurity analyses revealed a two-dimensionally reinforced SiCf/SiC with the matrix produced by \CVI\ as very pure. Chemo-spectrometric methods were combined with radioactivation methods (CPAA, NAA). A quantification of the main constituents Si, C and O was added. Calculations with the FISPACT-2.4 code and EAF-2 library identified elements detrimental for different low-activation criteria. For the neutron exposure, \EEF\ reactor-study first wall and blanket conditions were simulated. The calculated SiCf/ SiC included 48 trace elements. Even under conservative assumptions, all low-activation limits of European interest are fulfilled. Exclusively the hands-on recycling limit for the First Wall can intrinsically not be satisfied with SiC. The theoretical goal of a SiCf/SiC depleted of 28Si (isotopic tailoring) is critically discussed.
|Titolo:||Purity and radioactive decay behaviour of industrial 2D-reinforced SiCf/SiC composites|
|Data di pubblicazione:||1994|
|Digital Object Identifier (DOI):||10.1016/0022-3115(94)90140-6|
|Appare nelle tipologie:||1.1 Articolo in rivista|
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