公开(公告)号：US20240428965A1

公开(公告)日：2024-12-26

申请号：US18710851

申请日：2022-09-06

Applicant: NATIONAL INSTITUTE FOR MATERIALS SCIENCE ,  Japan Superconductivity Application Development Inc.

Inventor： Akihiro KIKUCHI ,  Yasuo IIJIMA ,  Masaru YAMAMOTO ,  Masatoshi KAWANO ,  Masato OTSUBO

IPC: H01B12/08 ,  H01F6/06

Abstract: The purpose of the present invention is to provide a niobium-aluminum precursor wire having properties such as expression of flexibility and ensuring a large single-wire length, as well as a twisted wire, a superconducting wire, and a superconducting twisted wire formed of the niobium-aluminum precursor wire. The present invention provides a niobium-aluminum precursor wire and a twisted wire using the same, the niobium-aluminum precursor wire including: a rod-like winding core (5) formed of a stabilized copper, or a stabilized copper and an unstabilized copper; a laminated body (3) that is wound around the winding core (5) and that is formed of an aluminum foil and a niobium foil laminated one on the other; and a covering body (1) that covers the circumference of the laminated body and that is formed of a stabilized copper, or a stabilized copper and an unstabilized copper. The volume ratio of the stabilized copper with respect to the unstabilized copper contained in the precursor wire is 0.5-2.0, and the volume ratios of the stabilized copper contained in the winding core (5) and the covering body (1) are within prescribed ranges. According to the present invention, a superconducting wire and a superconducting twisted wire are provided by thermally treating the precursor wire and the twisted wire.