Nb3Sn SUPERCONDUCTING WIRE AND PRECURSOR FOR THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a precursor for manufacturing a Nb3Sn superconducting wire which will not cause aδphase to be generated that is larger, in comparison with a Nb filament diameter and provides proper workability, even if bronze of high Sn concentration is used, and to provide the Nb3Sn superconducting wire capable of providing supercondutive properties of a practical level in a high magnetic field, by forming a multicore type precursor in which the cross-sectional structure of wire is optimized, if needed. SOLUTION: The precursor for manufacturing the Nb3Sn superconducting wire by a bronze method, in which plural Nb or Nb-based alloy cores are embedded in a Cu-Sn-based alloy base material. The Cu-Sn-based alloy base material contains Ti and/or Zr, in addition to Sn, and these components satisfy Equations 1 and 2 below, and where the symbol X denotes the content of Sn in mass% and the symbol Y denotes the total content of Ti and Zr in mass%. Here, the Equation 1 is 0.4≤(X-15.6)/Y≤1.9 and the Equation 2 is 15.6