The voltage–current relations for MgB2 obtained by reactive liquid infiltration

Giunchi, G.; Raineri, S; Wesche, R.; Bruzzone, Pierluigi

doi:10.1016/j.physc.2003.09.061

Cited by 42 publications

(30 citation statements)

References 11 publications

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“…Also for our MgB 2 sample we found a close resemblance between experimental variables and model interpretation, assuming the known Jc(B) behaviour, already set for analogous bulk materials [5].…”

Section: Introductionsupporting

confidence: 79%

PERSISTENT MAGNETIZATION OF MgB[sub 2] CYLINDERS INDUCED BY A PULSED FIELD

Giunchi¹,

Perini²,

Cavallin³

et al. 2008

AIP Conference Proceedings

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High stable trapped fields in bulk superconductors can be useful applied in many electrotechnical applications, as i.e. for motor/generators, for MRI systems or for magnetic separation devices. The HTS bulk materials appear as the matter of choice to this purpose and many attempts have been done on melt textured cuprates tiles, at temperatures up to 77K, applying constant magnetic fields or pulsed magnetization methods. Even if the pulse magnetization is far less effective than the DC magnetization in the trapping capability, it appears as the most friendly technique in practical devices. So we have studied the effects of the pulsed technique, applied to a bulk MgB 2 cylinder: a very promising device in view of the feasibility of similar much larger manufacts. To this purpose we have used a copper solenoid to magnetize the MgB 2 cylinder, with both cylinder and solenoid conductively cooled by a cryorefrigerator, in the range of temperatures between 5 and 20 K. This simple cryogenic arrangement can be representative of many more elaborate practical devices. Tailoring the applied pulsed field waveforms, we successfully magnetize cylinders of diameter of the order of 50 mm, reaching more that 0.5 T trapped flux density, in their centre, and the persistent magnetization is not affected by external perturbations. The parameters which regulate the trapping field performances are mainly related to the heat management of the MgB 2 cylinder.

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Section: Introductionsupporting

confidence: 79%

PERSISTENT MAGNETIZATION OF MgB[sub 2] CYLINDERS INDUCED BY A PULSED FIELD

Giunchi¹,

Perini²,

Cavallin³

et al. 2008

AIP Conference Proceedings

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“…High density bulk samples were prepared with Edison's patented method of reactive liquid infiltration (RLI) [4], [5], Bulk samples obtained by RLI method exhibit both high density and critical currents comparable to the values obtained with the use of a high pressure apparatus. The reaction took place at 900 for 3 hours.…”

Section: A Preparation Of Conductorsmentioning

confidence: 99%

“…All samples used in this study have a critical temperature of 39 K with benchmark critical current density in a field of 1 T exceeding at 20 K [5], [6].…”

Section: A Preparation Of Conductorsmentioning

confidence: 99%

“…R ECENT discovery [1] of superconductivity in with an intermediate critical temperature of has led to substantial international efforts in developing practical conductors [2], [3] and bulk materials [4], [5] for potential applications at this previously unheralded temperature range. The performance of these conductors has seen significant improvement benefited from the intensive parallel research on enhancing the critical current density and the irreversibility field of materials by doping, proton irradiation, addition of nanoparticles and mechanical alloying.…”

Section: Introductionmentioning

confidence: 99%

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Measurement of AC Losses in<tex>$rm MgB_2$</tex>Wire and Bulk Conductors at Different Temperatures

Yang

Young

Bianchetti

et al. 2005

IEEE Trans. Appl. Supercond.

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AC loss measurements were carried out on MgB 2 wire and bulk conductors at temperatures between 25 K and 40 K in applied field up to 0.2 T transverse to conductor length. For bulk conductors in the shape of a flat plate (3 mm 0.5 mm), loss behavior of a thin strip 4 0 was observed. A reduction of width to 1 mm leads to a change in loss behavior similar to a round wire with 3 0 . For the ex-situ MgB 2 wire of Ni sheath, losses were totally dominated by the hysteresis of ferromagnetic Ni. While the losses in the superconducting core is greatly reduced by the strong magnetic shielding by the Ni sheath, a small increase in the Ni loss was observed upon superconducting transition in the core. This is attributed to the compression of magnetic flux due to the diamagnetic superconducting core. Such an interpretation is supported by measurements of PbBi2223 tape in a cavity of an iron block.

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“…The superconducting transport properties of the Mg-RLI wires have been extensively described in the past [4,5].…”

Section: Hollow Wires From the Mg-rli Processmentioning

confidence: 99%

The cabling of MgB2 hollow wires by react and wind process

Albisetti

Schiavone²,

Ripamonti

et al. 2012

AIP Conference Proceedings

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Several architectures of superconducting MgB 2 multiwires cables have been manufactured in order to test the viability of a "React & Wind" process, to be used to build large superconducting magnets or high current transport cables and busbars. Round wire precursors are drawn with an internal Mg core, in order to produce a hollow superconducting phase by the "in situ" Reactive Mg Liquid Infiltration process. The precursor has been drawn to small diameters, of the order of half a millimetre, then it is braided according to various transposition geometries to realize a precursor cable. To obtain the superconducting cable, a final heat treatment is applied batch wise or continuously in a tube furnace. Finally, the cable may be stabilized by cladding it with low melting metals. Both braiding and cabling operations are done taking into account the mechanical characteristics of the wires and assuming a safety margin in the applied flexural strains. The transport superconducting properties of the cables are measured at different temperatures and magnetic fields and, in some cases, are checked also after small mechanical deformations of the cables. The deformation analysis is intended to determine the limiting strains that these superconducting cables can sustain.

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The voltage–current relations for MgB2 obtained by reactive liquid infiltration

Cited by 42 publications

References 11 publications

PERSISTENT MAGNETIZATION OF MgB[sub 2] CYLINDERS INDUCED BY A PULSED FIELD

PERSISTENT MAGNETIZATION OF MgB[sub 2] CYLINDERS INDUCED BY A PULSED FIELD

Measurement of AC Losses in<tex>$rm MgB_2$</tex>Wire and Bulk Conductors at Different Temperatures

The cabling of MgB2 hollow wires by react and wind process

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The voltage–current relations for MgB2 obtained by reactive liquid infiltration

Cited by 42 publications

References 11 publications

PERSISTENT MAGNETIZATION OF MgB[sub 2] CYLINDERS INDUCED BY A PULSED FIELD

PERSISTENT MAGNETIZATION OF MgB[sub 2] CYLINDERS INDUCED BY A PULSED FIELD

Measurement of AC Losses in&lt;tex&gt;$rm MgB_2$&lt;/tex&gt;Wire and Bulk Conductors at Different Temperatures

The cabling of MgB2 hollow wires by react and wind process

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Measurement of AC Losses in<tex>$rm MgB_2$</tex>Wire and Bulk Conductors at Different Temperatures