MgB2 Wires and Tapes: Properties and Potential

Goldacker, W.; Schlachter, S.I.; Zimmer, S.; Reiner, H.

doi:10.1007/3-540-45618-x_22

Cited by 7 publications

(9 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Bulk MgB 2 superconductors produced by solid state sintering at lower temperatures for longer times exhibited high critical current density at 20 K [29,30]. On the other hand, similar results were also observed in MgB 2 tapes and wires [31]. Recently, controlling the microstructural properties by adopting the optimum processing parameters is found to be effective in enhancing J c values of bulk MgB 2 material [32].…”

Section: Introductionmentioning

confidence: 72%

Optimization of sintering conditions in bulk MgB2 material for improvement of critical current density

Muralidhar

Nozaki

Kobayashi

et al. 2015

Journal of Alloys and Compounds

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 72%

Optimization of sintering conditions in bulk MgB2 material for improvement of critical current density

Muralidhar

Nozaki

Kobayashi

et al. 2015

Journal of Alloys and Compounds

View full text Add to dashboard Cite

“…Critical current densities above 10 5 A/cm 2 were reported in self field at 4.2 K. It also appears that the sheath may need to apply significant compressive stress to the powder core, as indicated by the correlation between sheath strength and J c in [27]. This point is also addressed in [11], where better performance was found for wires made with a Ta diffusion barrier and a reinforcing steel sheath outside the copper stabilizer. One reason for the better performance might be related to pulverization of the MgB 2 powder during wire deformation.…”

Section: Mgb 2 Wiresmentioning

confidence: 98%

“…In [9], combined electron microscopy and magneto-optical imaging showed that induced supercurrents flowed The data for Nb-Ti were taken from [3]; for Nb 3 Sn from [4]; for Bi-2212 from [5]. The data for MgB 2 came from [6] for films, [7]- [10] for bulk (see also fig. 2), and [11]- [16] for wires and tapes. around entire regions consisting of many tiny grains, indicating a lack of any weak links between the grains.…”

Section: J C and Flux Pinningmentioning

confidence: 99%

See 1 more Smart Citation

Potential application of magnesium diboride for accelerator magnet applications

Cooley

Eom²,

Hellstrom³

et al.

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)

View full text Add to dashboard Cite

This paper reviews the potential of the newly discovered and unexpected 39 K superconductor MgB 2 as a material for accelerator magnet strands. Unlike the high temperature cuprate superconductors, intergranular current flow in MgB 2 is not obstructed by weak links, removing one serious obstacle to the fabrication of wires. The critical current density J c exceeds 10 5 A/cm 2 in 1 T field at 4.2 K and in self-field at 20 K. However, the compound is anisotropic and the perpendicular upper critical field H c2^ in present bulk samples is comparable to or less than that in Nb47wt.%Ti at 4.2 K. Thin films have shown significantly higher J c and H c2 . Magnetization J c values at 4.2 K exceed 10 6 A/cm 2 in many reports, and approach 10 7 A/cm 2 for films with T c close to 39 K. In alloyed films with small grain size and high resistivity, the irreversibility field H* (~0.85H c2 ) is 16 T at 4.2 K in perpendicular field (and double that in parallel field), and J c exceeds 10 5 A/cm 2 up to 10 T at 4.2 K and 5 T at 20 K. Simple wires, which achieve the properties of sintered bulk samples, are being made by the powder-in-tube route, indicating potential application capability, particularly if alloyed MgB 2 wires replicating thin film properties can be made.

show abstract

“…Various techniques have reportedly achieved noteworthy J c properties. Those techniques include the use of harder sheath materials in the powder-in-tube (PIT) process [1][2][3], the multistage deformation and annealing process [4,5], and hot pressing [6], which engender densification of the MgB 2 core of the wires or tapes. Elemental doping with Al, Zn [7] and Ti [8] has been investigated to improve J c properties.…”

Section: Introductionmentioning

confidence: 99%