PRECURSOR FOR NB3SN SINGLE-CORE SUPERCONDUCTING WIRE RODS AND METHOD FOR PRODUCING SAME, NB3SN SINGLE-CORE SUPERCONDUCTING WIRE ROD

• Main Authors: SAKAMOTO, Hisaki, II, Hideki, SUGIMOTO, Masahiro, KATO, Tomoya, ASAMI, Daisuke, KATAYAMA, Kota
• Format: Patent
• Language: English; French; German
• Published: 09.10.2024
• Subjects: BASIC ELECTRIC ELEMENTS; CABLES; CONDUCTORS; ELECTRICITY; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING ORDIELECTRIC PROPERTIES

A precursor for Nb3Sn single-core superconducting wire includes: a Sn-based wire rod, a first Cu-based tube covering an outer circumferential surface of the Sn-based wire rod, an Nb-based tube covering an outer surface of the first Cu-based tube, and a second Cu-based tube covering an outer surface of the Nb-based tube, in which the Sn-based wire rod contains a matrix phase and at least one kind of hard phases that is harder than the matrix phase; and in a cross section parallel to a longitudinal direction of the precursor for Nb3Sn single-core superconducting wire, a maximum dimension of the hard phases in a width direction perpendicular to the longitudinal direction is 50% or less of a minimum dimension in the width direction of the Sn-based wire rod and/or is equal to or smaller than a minimum thickness in the width direction of the Nb-based tube.