Fabrication and superconducting properties of powder-in-tube processed MgB[sub 2] tapes and wires

Kumakura, H.; Matsumoto, Akiyoshi; Fujii, Hiroki; Takano, Yoshihiko; Togano, K.

doi:10.1063/1.1472623

Cited by 7 publications

(4 citation statements)

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“…Both MgB 2 and Bi-2223 wires or tapes use essentially the same technology as that used for Nb 3 Sn powder-in-tube composites. In fact, there is now no fundamental barrier to the production of a kilometre-long MgB 2 wire, and many groups have already demonstrated powder-in-tube conductors 30,[78][79][80][81][82] . What is less clear is how much of a niche there is for MgB 2 to fill, because even in its high resistivity form which maximizes the upper critical field 17 it seems that the perpendicular irreversibility field is less than for Nb 3 Sn.…”

Section: Materials Fabrication Considerationsmentioning

confidence: 99%

High-Tc superconducting materials for electric power applications

Larbalestier

Gurevich

Feldmann

et al. 2001

Nature

1,215

764

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Large-scale superconducting electric devices for power industry depend critically on wires with high critical current densities at temperatures where cryogenic losses are tolerable. This restricts choice to two high-temperature cuprate superconductors, (Bi,Pb)2Sr2Ca2Cu3Ox and YBa2Cu3Ox, and possibly to MgB2, recently discovered to superconduct at 39 K. Crystal structure and material anisotropy place fundamental restrictions on their properties, especially in polycrystalline form. So far, power applications have followed a largely empirical, twin-track approach of conductor development and construction of prototype devices. The feasibility of superconducting power cables, magnetic energy-storage devices, transformers, fault current limiters and motors, largely using (Bi,Pb)2Sr2Ca2Cu3Ox conductor, is proven. Widespread applications now depend significantly on cost-effective resolution of fundamental materials and fabrication issues, which control the production of low-cost, high-performance conductors of these remarkable compounds.

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Section: Materials Fabrication Considerationsmentioning

confidence: 99%

High-Tc superconducting materials for electric power applications

Larbalestier

Gurevich

Feldmann

et al. 2001

Nature

1,215

764

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“…[1][2][3][4] Long lengths of wire and tape [5][6][7] have been fabricated by both the in-situ and ex-situ methods, and several >1T coils have been wound. [8][9][10][11][12][13] Local J c (8 T, 4.2 K) values in bulk samples are beginning to approach those of NbTi wires.…”

Section: Introductionmentioning

confidence: 99%

Atmospheric conditions and their effect on ball-milled magnesium diboride

Senkowicz

Moyet

Mungall

et al. 2006

Supercond. Sci. Technol.

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Abstract. Magnesium diboride bulk pellets were fabricated from pre-reacted MgB 2 powder ball milled with different amounts of exposure to air. Evidence of increased electron scattering including increased resistivity, depressed T c , and enhanced H c2 of the milled and heat treated samples were observed as a result of increased contact with air. These and other data were consistent with alloying with carbon as a result of exposure to air. A less clear trend of decreased connectivity associated with air exposure was also observed. In making the case that exposure to air should be considered a doping process, these results may explain the wide variability of "undoped" MgB 2 properties extant in the literature.

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“…Although the magnetic for the tape was high such as 10 A/cm at 4.2 K and self-field, the resistive was low as 4000 A/cm at 4.2 K and self-field. This saturation of resistive is due to the heat generation at the contacts between the sample and current leads [9]. On studies of large transport critical current in dense Fe and Ni clad MgB superconducting tapes, the authors pointed out that lack of thermal stabilization caused sample quenching above a given current density in most samples and it will be essential to use thinner filamentary sample or multifilamentary tapes [5].…”

Section: Resultsmentioning

confidence: 99%

Field dependence of transport J/sub c/ for MgB/sub 2/ superconducting wire by suspension spinning

Gotō

Katoh

Watanabe

2003

IEEE Trans. Appl. Supercond.

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The field dependence of transport or MgB 2 superconducting wire by suspension spinning was examined at 4.2 K in magnetic field up to 10 T. The suspension spinning of commercially available MgB 2 powder was examined to fabricate a long superconducting MgB 2 wire. The as-drawn filaments were pressed and pyrolyzed to remove volatile components. The filamentary samples were then cold-pressed, enveloped by an iron sheet with a pellet of mixed powder of Mg and B or with Mg powder, and vacuum-sealed in a fused quartz tube and sintered. The of the sample was strongly dependent on the starting materials and sintering condition. Although the transport value was low such as 4500 A/cm 2 at 4.2 K and self-field, the value of more than 200 A/cm 2 was maintained by applying the field of 10 T.Index Terms-Field dependence of transport , filamentary MgB 2 , suspension spinning.

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Fabrication and superconducting properties of powder-in-tube processed MgB[sub 2] tapes and wires

Cited by 7 publications

References 0 publications

High-Tc superconducting materials for electric power applications

High-Tc superconducting materials for electric power applications

Atmospheric conditions and their effect on ball-milled magnesium diboride

Field dependence of transport J/sub c/ for MgB/sub 2/ superconducting wire by suspension spinning

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