Interplay between cold densification and malic acid addition (C4H6O5) for the fabrication of near-isotropic MgB2 conductors for magnet application
Autor: | Carmine Senatore, Yusuke Yamauchi, Dipak Patel, Md. Shahriar A. Hossain, Daniel Gajda, Mislav Mustapić, Jung Ho Kim, Aslam Khan, Andrzej Morawski, René-Louis Flukiger |
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Rok vydání: | 2020 |
Předmět: |
lcsh:TN1-997
Fabrication Materials science chemistry.chemical_element ddc:500.2 02 engineering and technology 01 natural sciences Magnesium diboride Cold high pressure densification Anisotropy Tapes Critical current density 0103 physical sciences Composite material Anisotropy Electrical conductor lcsh:Mining engineering. Metallurgy Cold high pressure densification 010302 applied physics Isotropy Doping Metals and Alloys Magnesium diboride Critical current density 021001 nanoscience & nanotechnology Magnetic field Tapes chemistry Mechanics of Materials Magnet 0210 nano-technology Carbon |
Zdroj: | Journal of Magnesium and Alloys, Vol 8, Iss 2, Pp 493-498 (2020) Journal of Magnesium and Alloys, Vol. 8, No 2 (2020) pp. 493-498 |
ISSN: | 2213-9567 |
Popis: | The effect of cold high pressure densification (CHPD) on anisotropy of the critical current density (Jc) in « in situ » single core binary and alloyed MgB2 tapes has been determined as a function of temperatures at 4.2 K, 20 K and 25 K as well as at applied magnetic fields up to 19 T. The study includes binary and C4H6O5 (malic acid) doped MgB2 tapes before and after CHPD. It is remarkable that the CHPD process not only improved the Jc values, in particular at the higher magnetic fields, but also decreased the anisotropy ratio, Γ = Jc///Jc┴. In binary MgB2 tapes, the anisotropy factor Γ increases with higher aspect ratios, even after applying CHPD. In malic acid (C4H6O5) doped tapes, however, the application of CHPD leads only to small enhancements of Γ, even for higher aspect ratios. This is attributed to the higher carbon content in the MgB2 filaments, which in turn is a consequence of the reduced chemical reaction path in the densified filaments. At all applied field values, it was found that CHPD processed C4H6O5 doped tapes exhibit an almost isotropic behavior. This constitutes an advantage in view of industrial magnet applications using wires with square or slightly rectangular configuration. |
Databáze: | OpenAIRE |
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