Properties of (NbTa)3Sn-Filamentary Conductors

Springer, E.; Wilhelm, Manfred; Weisse, H.; Rupp, G.

doi:10.1007/978-1-4613-9868-4_81

Cited by 5 publications

(4 citation statements)

References 5 publications

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“…When comparing the results of the present wires with 19 composite cores with those of multifilamentary wires with melted cores [2], one has to take into account that the present filament dimensions are nearly a factor of 20 larger. For the wires of Springer et a1 [2], the filaments are thus almost fully reacted, in contrast to the present composite core wires, where the layer thickness of the order of 1-2 pm was much smaller than the core radius, thus leading to a composition gradient.…”

Section: Resultscontrasting

confidence: 61%

“…Figure 5 shows a comparison between two wires with melted 5 and 7.5 wt% Ta cores (from Springer et al [2]) and our best sample with Nb/Ta composite cores. All samples have the same c1 and were subjected to the same heat treatment.…”

Section: Resultsmentioning

confidence: 99%

“…Characterisation of the 19 core Nb,Sn wires with Nb/8 wt% Ta composite cores and comparison with Nb-7.5 wt% Ta melted cores[2].…”

mentioning

confidence: 99%

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Enhancement of j_cat 10-12 T in Nb₃Sn wires by artificial Ta inclusions distributed at a nanometre scale

Klemm

Seibt

Specking

et al. 1990

Supercond. Sci. Technol.

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A new type of multifilamentary Nb,Sn wires prepared by the bronze route but with composite cores is found to exhibit considerably enhanced j , values with respect to conventional Ta alloyed wires in the intermediate field range, i.e. >30% between 10 and 12 T. The enhancement of jcis obtained by artificially introduced continuous ribbon-like Ta inclusions of d 10 nm thickness, i.e. close to the coherence length. These inclusions are distributed at a nanometre scale over the filament cross section. The enhanced pinning in the present wires ('artificial pinning') is a consequence of the new Nb,Sn/Tainterfaces with a total area comparable to that of the already existing grain boundary interface.The present method is an extension of the original powder-metallurgical composite core method recently developed in our laboratory. Considerable progress was achieved in view of industrial fabrication, the powder-metallurgical Nb/Ta cores being now replaced by continuous cores consisting of Ta rods surrounded by Nb tubes and bundled together. At the final stage, the Ta-Ta distance is estimated to be .y20 nm, i.e. close to the calculated flux line distance at 10 T. Measurements ofj, up to 20 T as well as the effects of uniaxial tensile strain onj, are presented. Further enhancement of j , is expected by optimising the Ta content and the separations of the Ta-Ta ribbons. the possibility to enhancej, at intermediate fields without the disadvantage of higher AC losses. This may be of particular interest in view of the conductors in future fusion magnets.

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Section: Resultscontrasting

confidence: 61%

Section: Resultsmentioning

confidence: 99%

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Enhancement of j_cat 10-12 T in Nb₃Sn wires by artificial Ta inclusions distributed at a nanometre scale

Klemm

Seibt

Specking

et al. 1990

Supercond. Sci. Technol.

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“…Possibilities for improving the superconducting properties of the Nb-Sn system by the use of third-and fourth-element additions have been extensively investigated (see [31,46,47,[67][68][69][70][71][72][73][74][75][76][77][78]) and reviewed [4,45]. Of a wide range of possible ternary additions, Ta and Ti are most widely applied in wires.…”

Section: Titanium and Tantalum Additionsmentioning

confidence: 99%

A review of the properties of Nb₃Sn and their variation with A15 composition, morphology and strain state

Godeke¹

2006

Supercond. Sci. Technol.

234

213

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Significant efforts can be found throughout the literature to optimize the current carrying capacity of Nb3Sn superconducting wires. The achievable transport current density in wires depends on the A15 composition, morphology and strain state. The A15 sections in wires contain, due to compositional inhomogeneities resulting from solid state diffusion A15 formation reactions, a distribution of superconducting properties. The A15 grain size can be different from wire to wire and is also not necessarily homogeneous across the A15 regions. Strain is always present in composite wires, and the strain state changes as a result of thermal contraction differences and Lorentz forces in magnet systems. To optimize the transport properties it is thus required to identify how composition, grain size and strain state influence the superconducting properties. This is not accurately possible in inhomogeneous and spatially complex systems such as wires. This article therefore gives an overview of the available literature on simplified, well defined (quasi-)homogeneous laboratory samples. After more than 50 years of research on superconductivity in Nb3Sn, a significant amount of results are available, but these are scattered over a multitude of publications. Two reviews exist on the basic properties of A15 materials in general, but no specific review for Nb3Sn is available. This article is intended to provide such an overview. It starts with a basic description of the Niobium-Tin intermetallic. After this it maps the influence of Sn content on the the electron-phonon interaction strength and on the field-temperature phase boundary. The literature on the influence of Cu, Ti and Ta additions will then be briefly summarized. This is followed by a review on the effects of grain size and strain. The article is concluded with a summary of the main results.

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High-Field Performance of Nb3Sn Superconductors Prepared from Intermediate Compound

Tachikawa

Kuroda

Tomori

et al. 1998

Advances in Cryogenic Engineering Materials

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Properties of (NbTa)3Sn-Filamentary Conductors

Cited by 5 publications

References 5 publications

Enhancement of j_cat 10-12 T in Nb₃Sn wires by artificial Ta inclusions distributed at a nanometre scale

Enhancement of j_cat 10-12 T in Nb₃Sn wires by artificial Ta inclusions distributed at a nanometre scale

A review of the properties of Nb₃Sn and their variation with A15 composition, morphology and strain state

High-Field Performance of Nb3Sn Superconductors Prepared from Intermediate Compound

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Properties of (NbTa)3Sn-Filamentary Conductors

Cited by 5 publications

References 5 publications

Enhancement of jcat 10-12 T in Nb3Sn wires by artificial Ta inclusions distributed at a nanometre scale

Enhancement of jcat 10-12 T in Nb3Sn wires by artificial Ta inclusions distributed at a nanometre scale

A review of the properties of Nb3Sn and their variation with A15 composition, morphology and strain state

High-Field Performance of Nb3Sn Superconductors Prepared from Intermediate Compound

Contact Info

Product

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Enhancement of j_cat 10-12 T in Nb₃Sn wires by artificial Ta inclusions distributed at a nanometre scale

Enhancement of j_cat 10-12 T in Nb₃Sn wires by artificial Ta inclusions distributed at a nanometre scale

A review of the properties of Nb₃Sn and their variation with A15 composition, morphology and strain state