Fabrication and critical current density in 16-filament stainless steel/Fe/MgB2 square wire

Soltanian, Saeid; Wang, X.L; Li, A.H; Collings, E. W.; Sumption, M.D.; Lee, E; Liu, Huan; Dou, Shi Xue

doi:10.1016/s0038-1098(02)00380-0

Cited by 16 publications

(23 citation statements)

References 11 publications

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“…Typical present day strands incorporate Fe or Cu, with perhaps Cu-Ni or monel as an outer sheath. There are two main variants for PIT MgB 2 fabrication, ex-situ [1][2][3][4], and in-situ [6,[10][11][12][13]. Each of these choices has some advantages and some disadvantages, we focus here on in-situ powders, aiming to look at the influence of SiC on H r and flux pinning, and to differentiate its influences in these two areas.…”

Section: Introductionmentioning

confidence: 99%

Irreversibility field and flux pinning in MgB₂with and without SiC additions

Sumption¹,

Bhatia²,

Dou

et al. 2004

Supercond. Sci. Technol.

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Critical current density was measured at 4.2 K for MgB 2 strands with and without SiC additions. In some cases measurements were performed on longer (1 m) samples wound on barrels, and these were compared to magnetic measurements. Most measurements were performed on short samples at higher fields (up to 18 T). It was found that in-situ processed strands with 10% SiC additions HT at 700-800°C show improved H r and F p values as compared to control samples, with H r increasing by 1.5 T. At 900°C even larger improvements are seen, with H r reaching 18 T and F p values maximizing at 20 GN/m 3 .

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Section: Introductionmentioning

confidence: 99%

Irreversibility field and flux pinning in MgB₂with and without SiC additions

Sumption¹,

Bhatia²,

Dou

et al. 2004

Supercond. Sci. Technol.

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“…In PIT method, the packing density of MgB 2 powder is very important to obtain a high critical current density (J c ) [15]. Several metals and alloys have been found to be suitable as sheath materials such as Fe [16], Cu [17], Ag [18], Fe/stainless steel [19], Cu Ni [20,21] and CuSn [22] in the PIT method. Sheath materials should be ductile for mechanic deformation and should not react with Mg and hence degrade the superconducting properties [16].…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Transport Critical Current Densities of MgB₂/Fe/Cu Multifilament Tapes without Any Intermediate Annealing

et al. 2012

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We have fabricated superconducting 6 and 7 laments MgB2/Fe/Cu tapes by ex situ powder-in-tube method using Cu-sheath without any intermediate annealing. Properties of two di erent multicore MgB2/Fe/Cu tapes annealed at 900 • C for 2 h in high purity argon gas atmosphere were compared. The samples were characterized using scanning electron microscope, X-ray di raction, electron dispersive spectroscopy, optical microscopy, critical transition temperature, transport critical current density, and magnetic measurements. Transport critical current densities of the 6 and 7 laments tapes were found to be 450 A/cm 2 and 190 A/cm 2 at 20 K, respectively. From X-ray di raction measurements, lattice parameters a and c were determined. From dc resistivity measurements, the connectivity between grains was investigated by using Rowell's connectivity analysis.

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“…A NUMBER of different research groups now successfully manufacture wires using the PIT method [1]- [12]. Two general approaches to using the PIT method exist: ex-situ [1]- [4] and in-situ [6], [11], and [12].…”

Section: Introductionmentioning

confidence: 99%

Effect on Deformation Process of Adding a Copper Core to Multifilament ${\rm MgB}_{2}$ Superconducting Wire

Hancock

Bay

2007

IEEE Trans. Appl. Supercond.

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Abstract-Using the PIT method, multifilament wire with different packing strategies has been manufactured. In all, three types of wire have been investigated, a 19-filament configuration using ex-situ powder in an Fe-matrix and two 8-filament configurations in an Fe-matrix applying a copper core, one using in-situ and another using ex-situ powder. The effect on the annealing requirements during mechanical processing of adding such a copper core has been investigated. The results show that the number of required annealings drops by about a factor of one half with the addition of a copper core. This finding is supported by numerical simulations of the deformation process which indicate that tensile stresses are concentrated around the middle of the wire during the drawing process. As such, strategic packing of the multifilament configuration can reduce the need for annealing during the mechanical deformation process. It is also found that the multifilament configuration using in-situ powder requires less annealing than the ex-situ counterpart. This is most likely due to the fact that in-situ powder is more readily compacted than ex-situ powder.Index Terms-Magnesium diboride, superconducting composites, superconducting filaments and wires, superconducting materials mechanical factors.

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Fabrication and critical current density in 16-filament stainless steel/Fe/MgB2 square wire

Cited by 16 publications

References 11 publications

Irreversibility field and flux pinning in MgB₂with and without SiC additions

Irreversibility field and flux pinning in MgB₂with and without SiC additions

Fabrication and Transport Critical Current Densities of MgB₂/Fe/Cu Multifilament Tapes without Any Intermediate Annealing

Effect on Deformation Process of Adding a Copper Core to Multifilament ${\rm MgB}_{2}$ Superconducting Wire

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Fabrication and critical current density in 16-filament stainless steel/Fe/MgB2 square wire

Cited by 16 publications

References 11 publications

Irreversibility field and flux pinning in MgB2with and without SiC additions

Irreversibility field and flux pinning in MgB2with and without SiC additions

Fabrication and Transport Critical Current Densities of MgB2/Fe/Cu Multifilament Tapes without Any Intermediate Annealing

Effect on Deformation Process of Adding a Copper Core to Multifilament ${\rm MgB}_{2}$ Superconducting Wire

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Product

Resources

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Irreversibility field and flux pinning in MgB₂with and without SiC additions

Irreversibility field and flux pinning in MgB₂with and without SiC additions

Fabrication and Transport Critical Current Densities of MgB₂/Fe/Cu Multifilament Tapes without Any Intermediate Annealing