Current densities and strain tolerances of filamentary MgB2 wires made by an internal Mg diffusion process

Since discovery of the Y-Ba-Cu oxide compound showing superconductivity above liquid nitrogen temperature, intensive study has been under way to clarify nature of the high Tc oxides[l-4]. Much efforts were also made in the field of superconductor applications. A number of studies have been carried out by a powder metallurgical process of Y-Ba-Cu oxide compound wires, although, obtained critical current densities were still low at liquid nitrogen temperature[5–6]. Other techniques for wire fabrication is also being attempted[7–9]. In this study, Y-Ba-Cu oxide superconducting composite tapes were prepared by a diffusion process, which is one of the promising methods to obtain a high critical current density.

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AC loss and DC critical current densities of Nb<inf>3</inf>Sn tapes by the solid state diffusion process

IEEE Transactions on Magnetics ◽

10.1109/tmag.1977.1059487 ◽

1977 ◽

Vol 13 (1) ◽

pp. 436-439 ◽

Cited By ~ 10

Author(s):

M. Suenaga ◽

C. Klamut ◽

J. Bussiere

Keyword(s):

Solid State ◽

Diffusion Process ◽

Critical Current ◽

Ac Loss ◽

Solid State Diffusion ◽

State Diffusion ◽

Current Densities

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Longitudinal uniformity of MgB2 wires made by an internal magnesium diffusion process

Superconductor Science and Technology ◽

10.1088/1361-6668/ac191b ◽

2021 ◽

Author(s):

Pavol Kovac ◽

Imrich Husek ◽

M. Hain ◽

Lubomir Kopera ◽

Tibor Melisek ◽

...

Keyword(s):

Diffusion Process ◽

Mgb2 Wires

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Improved superconducting properties for multifilament graphene-doped MgB2 wires by an internal Mg diffusion process

Materials Letters ◽

10.1016/j.matlet.2018.05.109 ◽

2018 ◽

Vol 227 ◽

pp. 305-307 ◽

Cited By ~ 3

Author(s):

Haoran Liu ◽

Qingyang Wang ◽

Fang Yang ◽

Lihua Jin ◽

Xiaomei Xiong ◽

...

Keyword(s):

Diffusion Process ◽

Superconducting Properties ◽

Mgb2 Wires ◽

Doped Mgb2

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Transport behavior and critical current densities in MgB2 wires

Applied Physics Letters ◽

10.1063/1.1403278 ◽

2001 ◽

Vol 79 (11) ◽

pp. 1649-1651 ◽

Cited By ~ 18

Author(s):

A. K. Pradhan ◽

Y. Feng ◽

Y. Zhao ◽

N. Koshizuka ◽

L. Zhou ◽

...

Keyword(s):

Critical Current ◽

Mgb2 Wires ◽

Transport Behavior ◽

Current Densities

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DC characterization of advanced fine-filamentary MgB2 superconducting wires.

Superconductor Science and Technology ◽

10.1088/1361-6668/ac4afe ◽

2022 ◽

Author(s):

Pavol Kovac ◽

Tibor Melisek ◽

Ján Kováč ◽

M. Búran ◽

Imrich Husek ◽

...

Keyword(s):

Low Temperature ◽

Critical Currents ◽

Ac Losses ◽

Stress And Strain ◽

Mgb2 Wires ◽

Superconducting Wires ◽

Current Densities ◽

Dc Characterization

Abstract MgB2 wires with 114, 192 and 342 filaments of size 14-19 µm manufactured by HyperTech Research, Inc. have been subjected to low temperature DC measurements. R(T), I-V characteristics, critical currents and stress and strain tolerances of these wires differing by filament architecture and filament size sheathed by resistive CuNi alloys were measured and compared with the literature data. It was found that these fine-filamentary wires have high engineering current densities not reduced by twisting up to 10 mm, sufficient strain tolerances and therefore are promising for future applications where minimised AC losses are required due resistive sheaths, thin MgB2 filaments and short twist pitches.

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MgB2 Composite Superconductors Made by Ex Situ and In Situ Process

Advances in Science and Technology ◽

10.4028/www.scientific.net/ast.47.131 ◽

2006 ◽

Vol 47 ◽

pp. 131-136 ◽

Cited By ~ 2

Author(s):

Pavol Kováč ◽

I. Hušek ◽

T. Melišek

Keyword(s):

Current Density ◽

Transport Current ◽

Ex Situ ◽

Boron Diffusion ◽

Critical Temperatures ◽

Mgb2 Wires ◽

Composite Superconductors ◽

Current Densities ◽

Composite Wires

Generally, two basic routes called as in-situ and ex-situ process are used for composite MgB2 wires now. Mentioned processes have been used for making of single-core composite wires. The applied heat treatment parameters influence the microstructure of MgB2 phase, critical temperature and critical current density, but it has also decisive effect on the MgB2/metal reaction. It was found that the transport current densities are much more sensitive to the used sheath material than critical temperatures. The main factors limiting the transport current density are cracks introduced by deformation and porosity caused by the boron diffusion in ex-situ and in-situ wires, respectively.

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