Properties of multifilamentary MgB2 wires fabricated by internal magnesium diffusion using amorphous and crystalline boron powders

Da Xu, Dongliang Wang, Chao Yao, Xianping Zhang, Yanwei Ma, Satoshi Awaji, Kazuo Watanabe

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

MgB2/Nb/Monel multifilamentary wires were fabricated using amorphous and crystalline boron powders by an internal Mg diffusion (IMD) process. The microstructure, morphology, and the critical current density ( Jc) of the reacted MgB2 layers in the multifilamentary wires made using different boron powders were analyzed and compared. The purity of boron powder influences greatly the transport properties of MgB2 wires. The Jc as high as 6.1 × 104 A cm-2 at 4.2 K, 10 T is obtained in the seven-core MgB2 wire made using amorphous boron powder. The IMD-processed seven-core MgB2 wire fabricated using high-purity crystalline boron powder has also a high Jc of 4.9 × 104 A cm-2 at 4.2 K and 10 T. However, the seven-core MgB2 wire prepared using low-purity crystalline boron powder has a relatively low Jc compared with the others, which is expected to allow the fabrication of large-scale and low-cost superconducting wires for practical application. The further improvement of layer Jc, nonbarrier Jc and engineering critical current density Je is necessary because of the irregular subfilaments and the inhomogeneous thickness of the reacted MgB2 layer in multifilamentary wires.

Original languageEnglish
Article number7776742
JournalIEEE Transactions on Applied Superconductivity
Volume27
Issue number4
DOIs
Publication statusPublished - 2017 Jun

Keywords

  • MgB multifilamentary wire
  • boron powder
  • critical current density
  • internal magnesium diffusion

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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