Development of A15 Multifilamentary Superconductors

Hillmann, H.; Pfister, Hugo; Springer, E.; Wilhelm, Manfred; Wohlleben, Karl

doi:10.1007/978-1-4684-3887-1_2

Cited by 20 publications

(1 citation statement)

References 5 publications

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“…One of the major problems in bronze process multifilamentary wires is the non-uniformity across the wire of the A15 layer formed during the heat treatments. Many research groups have attempted various techniques to achieve homogeneity across the wire, such as changing the geometry of the niobium filaments so that there are extra tin sources from bronze reservoirs to prevent tin depletion [12]. Having extra tin reservoirs does improve the homogeneity across the wire to a certain extent, but this will reduce the amount of niobium, and so the A15 phase, in the wire, causing a lower value of the overall engineering critical current density, J e .…”

Section: Introductionmentioning

confidence: 99%

In situresistance measurements of bronze process Nb–Sn–Cu–Ta multifilamentary composite conductors during reactive diffusion

Tan¹,

Hopkins²,

Glowacki³

et al. 2004

Supercond. Sci. Technol.

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The conditions under which the Nb 3 Sn intermetallic layer is formed by solid-state reactive diffusion processes in bronze process multifilamentary conductors greatly influence the performance of the conductors. By convention, isothermal heat treatment is used and often causes non-uniformity of A15 layers formed across the wire. Therefore, characterization and optimization of the conductor during the reactive diffusion processes is crucial in order to improve the overall conductor's performance. In this paper, a different characterization approach and perhaps an optimization technique is presented, namely in situ resistance measurement by an alternating current (AC) method. By treating the components of such multifilamentary wires as a set of parallel resistors, the resistances of the components may be combined using the usual rules for resistors in parallel. The results show that the resistivity of the entire wire changes significantly during the reactive diffusion processes. The development of the Nb 3 Sn layer in bronze process Nb-Sn-Cu-Ta multifilamentary wires at different stages of the reactive diffusion processes has been monitored using measured resistivity changes, and correlated with results from DTA, ACS, SEM and EDS.

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Section: Introductionmentioning

confidence: 99%

In situresistance measurements of bronze process Nb–Sn–Cu–Ta multifilamentary composite conductors during reactive diffusion

Tan¹,

Hopkins²,

Glowacki³

et al. 2004

Supercond. Sci. Technol.

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Superconductivity and Superconductors

Glowacki

2005

Kirk-Othmer Encyclopedia of Chemical Technology

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This article aims to address the issue of superconductivity and superconductors from the point of view of technology and applications, despite the fact that the majority of recent developments relate more to the fundamental aspects of superconductivity. The technology sections focus on the discovery of superconductivity and the phenomena and characteristics that define it. Low temperature superconductors (LTS) are discussed. Niobium and tantalum devices fall into this category. These materials are probably the most important electrode material for tunnel junction fabrication and are used in superconducting devices, eg, the superconducting quantum interference device (SQUID), X‐ray detectors, optical detectors, and mixers. Magnesium dibromide has made us aware of the possibility of the existence of new superconducting materials and this compound is detailed. High temperature ceramic superconductors are discussed and they focus mainly on the evolution of superconductivity by chemical doping of copper and its compounds. An extensive section on application includes details on the following uses: in transmission cables, research electromagnets, electromagnets for nmr and mri systems, current leads, fault current limiters, magnetically guided surgical instruments, and levitating train, to name a few.

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Intermetallics

Sauthoff

2006

Materials Science and Technology

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Development of A15 Multifilamentary Superconductors

Cited by 20 publications

References 5 publications

In situresistance measurements of bronze process Nb–Sn–Cu–Ta multifilamentary composite conductors during reactive diffusion

In situresistance measurements of bronze process Nb–Sn–Cu–Ta multifilamentary composite conductors during reactive diffusion

Superconductivity and Superconductors

Intermetallics

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