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 language | English |
---|---|
Article number | 7776742 |
Journal | IEEE Transactions on Applied Superconductivity |
Volume | 27 |
Issue number | 4 |
DOIs | |
Publication status | Published - 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