Advancements in the Reactive Liquid ${\rm Mg}$ Infiltration Technique to Produce Long Superconducting ${\rm MgB}_{2}$ Tubular Wires

Giunchi, G.; Ripamonti, G.; Perini, E.; Cavallin, T.; Bassani, E.

doi:10.1109/tasc.2007.900014

Cited by 40 publications

(42 citation statements)

References 16 publications

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“…This is confirmed on the macroscopic scale by observations following the formation of MgB 2 in the "internal magnesium diffusion" (IMD) process [51][52][53];…”

Section: Macrostructural Properties: the Reacted Strandmentioning

confidence: 66%

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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“…This is confirmed on the macroscopic scale by observations following the formation of MgB 2 in the "internal magnesium diffusion" (IMD) process [51][52][53];…”

Section: Macrostructural Properties: the Reacted Strandmentioning

confidence: 66%

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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“…Such a treatment can be done either batch wise or in a continuous way. In the past years we have elucidated the key parameters which govern the superconducting quality of these wires [6]. Among others we recall: a) the type of the boron powders, generally amorphous, but of various degree of purity and of grain size; b) the presence of additional doping powders, mainly carbonaceous species; c) the Mg to B ratio.…”

Section: The Mgb 2 Hollow Wires Manufacturingmentioning

confidence: 99%

MECHANICAL PROPERTIES OF MgB[sub 2] HOLLOW WIRES

Saglietti¹,

Perini²,

Albisetti³

et al. 2010

AIP Conference Proceedings

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The peculiar morphology of the MgB 2 wires resulting from the reactive liquid Mg infiltration technology (Mg-RLI), characterized by an annular distribution of the superconducting material, originates a peculiar mechanical behaviour. Monofilament wires of different size and different thickness of the superconducting material have been subjected to tensile and flexural deformation, in order to gain a comprehensive description of the mechanical behaviour of the superconducting material. A model based on a simplified description of the mechanical behaviour in term of few parameters aids the interpretation of the various experimental measurements and represents a tool to evaluate the mechanical behaviour of different specifically sized wires. Other variables entering in the mechanical model take into account the filling of the internal hole with the metallic Mg and the strength of the external metallic sheath. The present mechanical analysis gives hints on the limits of applicability of the react-and-wind process in magnet manufacturing with this kind of wires. A further output of the study is to find the variation of the intrinsic mechanical properties of the MgB 2 material as a function of the Carbon doping, obtained via SiC doping.

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“…2, and is based on the natural Infiltration of melted Mg inside a boron powders preform [15]. This new technology is particularly promising, allowing to produce long wires (more than hundred meter long) [16] and massive bodies particularly compact and robust [17]. The dimension of the original boron powders affects the transport properties of the MgB material and the submicronic powders, like that ones used in the wires production, realize the higher critical current density.…”

Section: The Mgb Optionsmentioning

confidence: 99%

$\hbox{MgB}_{2}$ Coil Options for Fusion Poloidal Magnets

Giunchi

Coppi

2010

IEEE Trans. Appl. Supercond.

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A hybrid solution is proposed for the IGNITOR research fusion machine by using of superconducting coils for some poloidal magnets, in association with high field copper magnets for the central solenoid and for the toroidal field coils. The choice to be made among the various superconductors is based on the materials performances in high magnetic field, on the mechanical strength of the conductors and on the cost of manufacturing large coils. In this study we analyze a coil based on MgB 2 , a "medium temperature" superconducting material that we expect will avoid, in association with others high temperature superconductors, the use of liquid He in future machines. The external poloidal magnet, 5 m in diameter and subjected to a magnetic field of 5 T, represents a real test bench of the technical issues which should be addressed in the exploitation of the future fusion reactors. To fulfil the technical characteristics of the selected magnet we must optimize the fill factor of the superconducting MgB2 wires, increasing the presently obtained 30% value. Accordingly, the effective current density in the superconducting wire should be of about 1500 A/mm 2 (@10 K, 5 T), a value which is compatible with the present best MgB 2 laboratory short wires, doped by C or SiC.

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Advancements in the Reactive Liquid ${\rm Mg}$ Infiltration Technique to Produce Long Superconducting ${\rm MgB}_{2}$ Tubular Wires

Cited by 40 publications

References 16 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

MECHANICAL PROPERTIES OF MgB[sub 2] HOLLOW WIRES

$\hbox{MgB}_{2}$ Coil Options for Fusion Poloidal Magnets

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Advancements in the Reactive Liquid ${\rm Mg}$ Infiltration Technique to Produce Long Superconducting ${\rm MgB}_{2}$ Tubular Wires

Cited by 40 publications

References 16 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

MECHANICAL PROPERTIES OF MgB[sub 2] HOLLOW WIRES

$\hbox{MgB}_{2}$ Coil Options for Fusion Poloidal Magnets

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