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

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

机构地区：[1]School of Mechanical and Mining Engineering,The University of Queensland,Brisbane,QLD 4072,Australia [2]Department of Quantum Matter Physics(DQMP),University of Geneva,Geneva,Switzerland [3]Key Laboratory of Eco-chemical Engineering,College of Chemistry and Molecular Engineering,Qingdao University of Science and Technology,Qingdao 266042,China [4]School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology(AIBN),The University of Queensland,Brisbane,QLD 4072,Australia [5]International Center for Materials Nanoarchitectonics(WPI-MANA),National Institute for Materials Science(NIMS),1-1 Namiki,Tsukuba,Ibaraki 305-0044,Japan [6]University of Osjek,Departiment of Physics,31000Osijek,Croatia [7]Institute of Low Temperature and Structure Research PAS,Okolna 2,50-422 Wroclaw,Poland [8]Research Center for Functional Materials,National Institute for Materials Science(NIMS),1-2-1 Sengen,Tsukuba,Ibaraki 305-0047,Japan [9]King Abdullah Institute for Nanotechnology,King Saud University,Riyadh,11451,Saudi Arabia [10]Australian Institute for Innovative Materials(AIIM),University of Wollongong,Squires Way,North Wollongong,NSW 2500,Australia [11]Institute of High Pressure Physics,Polish Academy of Sciences(PAS),Sokoiowska 29/37,01-142 Warsaw,Poland

出　　处：《Journal of Magnesium and Alloys》2020年第2期493-498,共6页镁合金学报（英文）

基　　金：This work was supported by the Australian Research Council(Grant No.LP160101784);A.K.thanks the Researchers Supporting Project(RSP-2019/127);King Saud University,Riyadh,Saudi Arabia for the support.This work was performed in part at the Queensland node of the Australian National Fabrication Facility,a company established under the National Collaborative Research Infrastructure Strategy to provide nano-and microfabrication facilities for Australia's researchers.M.M.acknowledges an internal funding project of the University of Osijek(ZUP-2018).

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.

关 键 词：Magnesium diboride Cold high pressure densification Anisotropy TAPES Critical current density 

分 类 号：TQ132.2[化学工程—无机化工]