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Development and Superconducting Properties of Practical 18- and 30-Filamentary MgB2 Long Wires with Twisting by the In Situ Way
- Source :
- Journal of Superconductivity and Novel Magnetism. 33:2657-2662
- Publication Year :
- 2020
- Publisher :
- Springer Science and Business Media LLC, 2020.
-
Abstract
- In this work, practical kilometer-length 18- and 30-filament Monel/Nb/MgB2 wires have been prepared by in situ powder-in-tube (PIT) method, combing in the twisting of wires with twisting pitches (TP) of 5 mm, 10 mm, and 20 mm. Transport critical current density (Jc) properties at various temperatures and magnetic fields for MgB2 wires with different TP and the effects of the heat-treatment conditions and wire diameter size on the Jc of 30- filament wire have been investigated in detail. The results suggest the Jc of MgB2 wire without twisting at 4.2 K, 4 T, and 20 K, 3 T separately reaches 1.9 × 105 and 5.87 × 104 A/cm2 for 30-filament wire, and 1.48 × 105 and 4.4 × 104 A/cm2 for 18-filament wire. After twisting, as the TP reduction, the Jc degradation of MgB2 wire is much slower in 30-filament than that in 18-filament at various magnetic fields. At the TP of 5 mm, the Jc degradation comparing with the untwisted wires at 4.2 K and 4 T is up to 30% in 18-filament wire but only about 10% in the 30-filament. This work indicates that the twisting route is very promising to the engineering application of MgB2 superconductor.
- Subjects :
- 010302 applied physics
Superconductivity
In situ
Materials science
Monel
Combing
engineering.material
Condensed Matter Physics
01 natural sciences
Electronic, Optical and Magnetic Materials
Magnetic field
Protein filament
0103 physical sciences
engineering
Development (differential geometry)
Critical current
Composite material
010306 general physics
Subjects
Details
- ISSN :
- 15571947 and 15571939
- Volume :
- 33
- Database :
- OpenAIRE
- Journal :
- Journal of Superconductivity and Novel Magnetism
- Accession number :
- edsair.doi...........3a1b126cc264f84b57305a40a83782ce