Development of magnesium diboride (MgB2) wires and magnets using in situ strand fabrication method

Tomsic, M.; Rindfleisch, M.; Yue, J.; McFadden, Kevin; Doll, David; Phillips, J. L.; Sumption, M.D.; Bhatia, M.; Bohnenstiehl, S.; Collings, E. W.

doi:10.1016/j.physc.2007.01.009

Cited by 134 publications

(109 citation statements)

References 7 publications

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“…The powders were planetary milled at 100 rpm for 10 minutes followed by additional planetary milling steps performed at 500 rpm for 12 mins. Bimetallic Nb/monel tubes were filled with this powder using HTR's previously described "CTFF" process [48][49][50] in preparation for wire drawing to a diameter of 0.83 mm followed by in-situ heat treatment (HT).…”

Section: Introductionmentioning

confidence: 99%

Drawing induced texture and the evolution of superconductive properties with heat treatment time in powder-in-tubein situprocessed MgB₂strands

Susner

Daniels

Sumption

et al. 2012

Supercond. Sci. Technol.

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Monocore powder-in-tube MgB 2 precursor strands were cold-drawn and heat- This effect is attributed to the fibrous macrostructure and its accompanying anisotropic connectivity. Magnetic measurements with the field directed along the strand axis yielded a critical density, J cm ┴ (B), for current flowing transversely to the strand axis that was less than and dropped off more rapidly than J ct (B). In the conventional magnetic measurement, the loop currents that support the magnetization are restricted by the lower of J ct (B) and J cm  (B). In the present case the latter, leading to the premature dropoff of the measured J cm (B) compared to J ct (B) with increasing field. This result is supported byKramer plots of the J cm  (B) and J ct (B) data which lead to an irreversibility field for transverse current that is very much less than the usual transport-measured longitudinal one, B irr,t .

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Section: Introductionmentioning

confidence: 99%

Drawing induced texture and the evolution of superconductive properties with heat treatment time in powder-in-tubein situprocessed MgB₂strands

Susner

Daniels

Sumption

et al. 2012

Supercond. Sci. Technol.

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“…Therefore, practical and stable MgB2 wire needs to be fine-filamentary structured and also thermally stabilized by high conductive metallic element. Oxygen free high conductive copper (OFHC) is a widely used material for stabilized technical superconductors and it was already applied for MgB2 wires [4][5]. Stabilizing copper reacts strongly with magnesium at high temperatures and therefore has to be carefully protected by diffusion barrier (e.g.…”

Section: Introductionmentioning

confidence: 99%

Stability of multi-core MgB2/Ti/Cu/SS wires

et al. 2011

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Stability of 19-filaments MgB 2 /Ti/Cu/SS wires carrying the transport currents has been examined. Properties of two identical wires annealed at 600 o C/2.5 h and 800 o C/0.5 h were compared. It was found that annealing conditions influence not only the current carrying capacity of MgB 2 filaments but also affect the inter-diffusion at Ti/Cu and Cu/SS interfaces, which is worsening the electrical and thermal conductivities of composite elements. Consequently, differences in wire's resistances and I-V quenches were measured, which are correlating well with experimentally estimated minimum quench energy and normal zone propagation velocity.

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“…Fig. 6 shows a comparison of transport J c at 4.2 K for SiC doped samples by the authors' group [37], Dou et al [38], Matsumoto et al [39], and Tomsic et al [40]. The in-field J c for the nano-SiC doped samples increased by more than one order of magnitude, compared with the undoped samples.…”

Section: Carbon Dopingmentioning

confidence: 94%

“…The results demonstrated that nano-C doping combined with high energy ball milling techniques is an effective method for further enhancing the current capacity of MgB 2 B . Tapes [37] Wires [38] Tapes [39] Wires [40] Magnetic field (T) The significant enhancement of J c , BB irr , and B c2 B in MgB 2 by nano-SiC doping was first shown by Dou's group [2]. A high BB irr of 29 T and B c2 B of 37 T have been achieved for nano-SiC doped MgBB 2 wires [3,36].…”

Section: Carbon Dopingmentioning

confidence: 99%

Development of Doped ${\rm MgB}_{2}$ Wires and Tapes for Practical Applications

Gao

Wang

et al. 2010

IEEE Trans. Appl. Supercond.

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Abstract-A review of current developments in the study of chemical doping effect on the superconducting properties of MgB 2 wires and tapes is presented, based on the known literature data and our own results. The critical current density of MgB 2 can be improved through various kinds of dopants. Among these dopants, doping with carbon-containing materials seems to be the most effective way to improve the J c performance. The doping effect of carbon in different forms and carbon-based compounds such as SiC, nano-C, metal carbides, as well as aromatic hydrocarbon and carbohydrate on the J c -B characteristics of MgB 2 was discussed in detail. The C can be incorporated into the MgB 2 crystal lattice by replacing boron, and thus BB c2 is significantly enhanced due to selective tuning of impurity scattering of the π and σ bands in the two-band MgB 2 . Besides the efforts of increasing B c2 B by carbon doping, the fine grain size and nano-size inclusions caused by doping would create many flux pinning centres improving the J c -B property of MgB 2 . Based on these considerations, we suggested some principles for the selection of dopants.

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Development of magnesium diboride (MgB2) wires and magnets using in situ strand fabrication method

Cited by 134 publications

References 7 publications

Drawing induced texture and the evolution of superconductive properties with heat treatment time in powder-in-tubein situprocessed MgB₂strands

Drawing induced texture and the evolution of superconductive properties with heat treatment time in powder-in-tubein situprocessed MgB₂strands

Stability of multi-core MgB2/Ti/Cu/SS wires

Development of Doped ${\rm MgB}_{2}$ Wires and Tapes for Practical Applications

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Development of magnesium diboride (MgB2) wires and magnets using in situ strand fabrication method

Cited by 134 publications

References 7 publications

Drawing induced texture and the evolution of superconductive properties with heat treatment time in powder-in-tubein situprocessed MgB2strands

Drawing induced texture and the evolution of superconductive properties with heat treatment time in powder-in-tubein situprocessed MgB2strands

Stability of multi-core MgB2/Ti/Cu/SS wires

Development of Doped ${\rm MgB}_{2}$ Wires and Tapes for Practical Applications

Contact Info

Product

Resources

About

Drawing induced texture and the evolution of superconductive properties with heat treatment time in powder-in-tubein situprocessed MgB₂strands

Drawing induced texture and the evolution of superconductive properties with heat treatment time in powder-in-tubein situprocessed MgB₂strands