Fabrication and Electromagnetic Properties of 24-Filament Jelly-Roll Nb 3 Al Superconducting Long Wire with Reel-to-Reel
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ORIGINAL PAPER
Fabrication and Electromagnetic Properties of 24-Filament Jelly-Roll Nb3Al Superconducting Long Wire with Reel-to-Reel Rapid Heating and Quenching Heat Treatment X. F. Pan 1 & X. G. Sun 2 & Z. Yu 3 & D. Y. Wang 2 & X. S. Yang 3 & G. Yan 2 & Y. Zhao 1,3 Received: 28 March 2020 / Accepted: 2 May 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract In this paper, a simple 24-filament structure Nb3Al superconducting wire has been firstly prepared by using the jelly-roll Nb/Al composite wire, the reel-to-reel rapid heating and quenching (RHQ), and phase transformation heat treatment. In order to obtain the Nb3Al long wire with good superconducting properties, various heating current (HC) and wire moving speed (WMS) were used to produce high-quality Nb(Al)ss supersaturated solid solution during RHQ process; thereafter, the Nb(Al)ss wire was put into the Cu tube and drawn for preparing the Cu-cladded Nb3Al wire. The results suggest that for the Nb3Al wire with the HC 262 A and WMS of 300 mm/s, its onset Tc and layer Jc at 4.2 K and 12 T measured by the transport way reach 17.7 K and 1.58 × 105 A/cm2, respectively. The magnetization measurement (M-H) of Nb3Al wires indicate that the diameter reduction of Nb(Al)ss solid solution wires after RHQ will significantly improve their grain connectivity and thus Jc properties at the optimal heat treatment conditions. The work suggests the simple-structured Nb3Al superconducting wire is promising to the practical highfield magnet application. Keywords A15 superconductor . Nb3Al . Jelly-roll . Rapid heating and quenching (RHQ)
1 Introduction Nb3Al superconductor is still attractive for high-field magnet application as an alternative of Nb 3Sn superconductor. Comparing to the RRP (Rod-Restack process) Nb3Sn wire, it owns many advantages, like the low manufacturing cost at the precursor wire and heat treatment, very little currentcarrying capability degradation after the cabling by using the
* X. F. Pan [email protected] * Y. Zhao [email protected] 1
Fujian Provincial Collaborative Innovation Center for Advanced High-Field Superconducting Materials and Engineering, College of Physics and Energy, Fujian Normal University, Fuzhou 350117, China
2
Western Superconducting Technologies, Co. Ltd (WST), Xi’an 710018, China
3
Key Laboratory of Advanced Technology of Materials (Ministry of Education), Superconductivity and New Energy R&D Center, Southwest Jiaotong University, Chengdu 610031, China
ductile Nb(Al)ss solid solution, excellent strain tolerance ability, and so on [1–4]. Many practical engineering results have certified it much available to large-scale superconducting magnet application, such as magnetic confinement fusion and high-energy particle (HEP) accelerator magnets [5–9]. Through of about two decades development, the rapid heating and quenching and post-annealing technique has been proved to being effective and necessary to produce highperformance Nb3Al superconducting wires. Recently, much cost-friendly rapid heati
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