Interplay between cold densification and malic acid addition (C4H6O5) for the fabrication of near-isotropic MgB2 conductors for magnet application

Andrzej J Morawski; Aslam Khan; Carmine Senatore; Daniel Gajda; Dipak Patel; Jung Ho Kim; Md.Shahriar A.Hossain; Mislav Mustapic; Rene Flukiger; Yusuke Yamauchi

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Interplay between cold densification and malic acid addition (C4H6O5) for the fabrication of near-isotropic MgB2 conductors for magnet application

Interplay between cold densification and malic acid addition (C4H6O5) for the fabrication of near-isotropic MgB2 conductors for magnet application

作者：

Andrzej J Morawski Aslam Khan Carmine Senatore Daniel Gajda Dipak Patel Jung Ho Kim Md.Shahriar A.Hossain Mislav Mustapic Rene Flukiger Yusuke Yamauchi

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Magnesium

diboride

Cold

high

pressure

densification

Anisotropy

TAPES

Critical

current

density

摘要：

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,Г=JC^///JC^⊥In binary MgB2 tapes,the anisotropy factor F 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 ofГ,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.

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篇名	Interplay between cold densification and malic acid addition (C4H6O5) for the fabrication of near-isotropic MgB2 conductors for magnet application
来源期刊	镁合金学报(英文)	学科	工学
关键词	Magnesium diboride Cold high pressure densification Anisotropy TAPES Critical current density
年，卷（期）	2020,（2）	所属期刊栏目
研究方向		页码范围	493-498
页数	6页	分类号	TM2
字数		语种
DOI