SUPERCONDUCTION WIRE MATERIAL, PRECURSOR OF SUPERCONDUCTION WIRE MATERIAL, METHOD OF MANUFACTURING THE SAME, AND PRECURSOR OF SUPERCONDUCTION MULTI-CORE CONDUCTOR

摘要

PROBLEM TO BE SOLVED: To provide a superconduction wire material or the like having a wire material length sufficiently longer than before and has a high critical current density being uniform across the entire length.;SOLUTION: It is assumed that density of a diboride magnesium core 1 is 1.5 g/cm³ or higher, and, relating to a void 4 present in an arbitrary longitudinal cross section along length direction of a superconduction wire material 10, a length of a line segment connecting two farthest points together on a closed curve forming the void 4 is L. Here, the number of voids 4 in which an angle formed between the line segment and an axis in length direction of the superconduction wire material 10 is 45° or larger, among the voids 4 having the length L being 20 μm or longer, is less than the number of voids 4 in which the angle formed between the line segment and the axis in length direction of the superconduction wire material 10 is less than 45°. In an arbitrary region of 100 μm in length direction of the longitudinal cross section, when a virtual approximate straight line from least square method is drawn for a border curve between the diboride magnesium core 1 and a metal sheath 2, a distance between the approximate straight line and the border curve is 10 μm or shorter.;COPYRIGHT: (C)2014,JPO&INPIT