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Metallurgy of Continuous Filamentary A15 Superconductors

  • Masaki Suenaga
Part of the NATO Advanced Study Institutes Series book series (NSSB, volume 68)

Abstract

Composite superconductors, which consist of fine filaments of superconductors in normal metals, have gained almost universal acceptance in magnet construction. These composites are usually twisted in order to increase their electromagnetic stability and reduce the energy loss in time-varying magnetic field applications [1]. Originally the superconducting materials used in these composites were restricted to the ductile superconducting alloys, mainly Nb-Ti. However, owing to a need for improvements in the design of magnets for superconducting synchrotrons and for magnetic fusion reactors, metallurgical methods for producing such filamentary conductors with brittle A15 structured superconductors were developed in the past few years. In 1969-1970, a method for fabricating such conductors with Nb3Sn and V3Ga was successfully developed and is now called the bronze process [2, 3, 4]. The method relies on the fact that these A15 compounds can be formed at the interface of Nb(V) and Cu-Sn(Ga) when such composites are heated at elevated temperatures.

Keywords

Diffusion Couple Critical Current Density Layer Growth Compound Layer Layer Growth Rate 
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Copyright information

© Plenum Press, New York 1981

Authors and Affiliations

  • Masaki Suenaga
    • 1
  1. 1.Metallurgy and Materials Science DivisionBrookhaven National LaboratoryUptonUSA

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