Influence of annealing temperature and isostatic pressure on microstructure and superconducting properties of isotopic Mg11B2 wires fabricated by internal Mg diffusion method

Gajda, D.; Zaleski, A. J.; Morawski, A.; Babij, M.; Szymański, Damian; Rindfleisch, M.; Patel, Dipak; Hossain, Md. Shahriar A.

doi:10.1016/j.jallcom.2022.167660

Cited by 3 publications

(1 citation statement)

References 34 publications

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“…However, the critical current density (J c ) of MgB 2 wire at 20 K needs to be brought to a level that can compete with the J c of commercially used NbTi wire at 4.2 K [7]. Studies show that the use of MgB 2 wires, produced by the internal Mg diffusion (IMD) method, is possible in large-scale applications [8][9][10][11][12][13][14][15]. IMD MgB 2 wires have much higher J c than that of powderin-tube processed MgB 2 wires [16].…”

Section: Introductionmentioning

confidence: 99%

Optimized superconducting MgB₂ joint made by IMD technique

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Gajda

et al. 2023

Supercond. Sci. Technol.

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A novel type superconducting joining technique has been introduced to join unreacted IMD single-core MgB2 wires. Our method is based on fabricating a small diameter joint mould obtained by deforming an Nb/Cu composite tube with a longitudinal semi-cylindrical Mg and B composite into a thick round wire. The small diameter of the joint provided advantages such as rapid cooling, low resistance, and the unique core design inside the joint ensured a uniform MgB2 phase formation. Scanning electron microscope analysis revealed that the IMD MgB2 wires had excellent contact with the superconducting MgB2 bulk material inside the joint. The joint resistance, calculated from the decay of the trapped magnetic field over time, is a quite low value of 6.44×10-16 Ω at 20 K. The transport critical current (Ic) of the joint is 62 A at 20 K under a self-magnetic field, and the n-value of the joint is 66 at 20 K under 1.5 T. The results showed that the Ic of our joint could be determined precisely, regardless of whether the magnetic field was applied from low to high or from high to low value during I – V measurements.

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