| 摘要 |
PURPOSE:To make the critical current density higher by mixing particular oxides with a particular composition ratio to produce a mixture material, and inserting said mixture material and a core wire into a metal sheath to form a composite material, and subjecting a strand consisting of the composite material to a heat treatment. CONSTITUTION:A mixture material, prepared by mixing a first and second oxides denoted by the formula I, formula II with a composition ratio of 1:alpha (5>alpha>1), and a metal core wire are inserted into a metal sheath 5 to form a composite material. Then, a multiplicity of the composite material are bundled together and subsequently subjected to compression working and nextly to heat treatment to produce a superconductive multiconductor wire 9. By this heat treatment, a diffusion reaction can take place in a state wherein the first oxide is surrounded by the fused second oxide so that a higher critical current density can be achieved. In the formula I, II, A expresses one or more of group IIIa elements in the periodic table, B expresses one or more of group IIa elements in the periodic table, and y expresses an integer 5-15. |
