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  4. Synchrotron microtomography investigation of the filament microstructure in differently processed Bi-2212 wires
 
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2017
Journal Article
Title

Synchrotron microtomography investigation of the filament microstructure in differently processed Bi-2212 wires

Abstract
The Bi-2212 microstructure and porosity distribution in entire state-of-the-art multifilament wires was characterized by high-energy synchrotron X-ray absorption microtomography after meltprocessing at ambient pressure, at 100 bar overpressure, and at ambient pressure after prior cold isostatic pressing of initially identical as-drawn wires. Beyond the visualization of the Bi-2212 microstructure, the porosity distribution in the different filament bundles has been quantified. Spherical granulometry and finite percolation probability calculations have been performed in order to provide a measure for the porosity distribution and to compare filament connectivity in the axial wire direction. Possible artifacts of the microtomography (m-CT) experiment and the possibility to estimate the effect of the Bi-2212 microstructure as seen in the m-CT images on critical current density are discussed.
Author(s)
Scheuerlein, C.
Rack, A.
Schladitz, K.
Fraunhofer-Institut für Techno- und Wirtschaftsmathematik ITWM  
Huwig, L.
Journal
IEEE transactions on applied superconductivity  
DOI
10.1109/TASC.2016.2644539
Language
English
Fraunhofer-Institut für Techno- und Wirtschaftsmathematik ITWM  
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