NDLI: <formula formulatype=inline><tex Notation=TeX>$hbox{MgB}_{2}$</tex></formula> Hollow Wires and Cables Embedded in a Mg Alloy Matrix

Content Provider	IEEE Xplore Digital Library
Author	Giunchi, G. Saglietti, L. Albisetti, A.F. Perini, E. Schiavone, C. Ripamonti, G. Uglietti, D. Bruzzone, P.L.
Copyright Year	2002
Abstract	The brittleness of the MgB₂ wires prevents performing a cable architecture with very small bending radius, similar to NbTi Rutherford cables. Consequently, it is important to reduce the thickness of the superconducting materials in order to increase its bending strain limit. In this context, thin Ni sheathed MgB₂ hollow wires, having wall thickness of the order of 20 μm and length of the order of 100 m, have been produced by the Reactive Mg-Liquid Infiltration process (Mg-RLI). The latest hollow monofilament made by Mg-RLI shows very high transport properties, having an engineering critical current density at 4.2 K, 3 T of 730 A/mm². In this wire the small thickness of the MgB₂ corona allows a twisting with pass of the order of a few cm and fulfils the thermal stability criterion for MgB₂. We have demonstrated that cables made by such braided or twisted wires may be conveniently reinforced, by embedding the wires in a molten Mg bath, so that the Ni sheath is almost completely dissolved and the wires are clad by an eutectic Mg10%at Ni alloy. This alloyed matrix is structurally well connected to the MgB₂ material, with minimal thermal and electrical resistance at the interface. A cable prototype based on this metallic composite has been prepared with 21 mono-core MgB₂ wires, twisted around a central hole, which may be useful for cooling purposes. This cable design may be applied as current leads or in short bus-bars, for high current supply.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	6200605
Ending Page	6200605
Page Count	1
File Size	441761
File Format	PDF
ISSN	10518223
Volume Number	23
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Wires Superconducting cables Powders Nickel Billets Cable shielding thermal instability Cabling architecture $\hbox{MgB}_{2}$ multifilament wires Ni alloy reactive liquid infiltration
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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