Effects of Mg-Coating and Boron Type on Electromechanical Properties of IMD MgB2/Fe Wires

• Published in: Journal of superconductivity and novel magnetism Vol. 34; no. 8; pp. 2121 - 2129
• Main Authors: Avcı, D., Yetiş, H., Karaboğa, F., Akdoğan, M., Belenli, İ.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01-08-2021
• Subjects: Characterization and Evaluation of Materials; Condensed Matter Physics; Magnetic Materials; Magnetism; Original Paper; Physics; Physics and Astronomy; Strongly Correlated Systems; Superconductivity; Mg coating; IMD; MgB; Boron; Bending strain; Hardness
• ISSN: 1557-1939; 1557-1947
• DOI: 10.1007/s10948-021-05951-6

In this study, mechanical and electrical characterization measurements were performed on non-bent and gradually bent IMD MgB
2
/Fe superconducting round wires having 0.81 mm outer diameter. Four straight IMD wires were successively bent to 150 mm, 125 mm, and 100 mm bending diameters and characterized after each bending step. IMD wires were produced using two types of boron powders (PVZ Nano Boron, purity > 98.5%, particle sizes < 250 nm, and PVZ boron, purity of 95–97%, particle sizes < 1 μm) by filling them into Mg-coated and uncoated iron tubes. The coated Mg was considered as an extra source of Mg that diffuses into the Mg + 2B core without causing any porosity during the reaction. We have investigated the effect of Mg coating on the transport and electromechanical properties of the wires and found that the Mg coating process improves the
J
ce
before and after bending. Also, our results have revealed that crack formation in core regions of mono filament bent IMD wires depends on the type of boron, since the use of nano-sized boron significantly increases the hardness of the MgB
2
core.