| 摘要 |
PURPOSE:To keep off any deterioration of a superconductive characteristic due to a shortage of oxygen removing a part of the metallic stabilized layer that covered an oxide superconductor, exposing the superconductor, and performing heat treatment for it. CONSTITUTION:Powder of superconductive materials of Y2O3 or the like is charged into a metallic sheath of copper or the like serving as a stabilized layer 3. Next, this powder is compressed and formed and then wire drawing is carried, setting it down to the desired wire diameter. Then, the stabilized layer 3 on a wire rod surface is ground an exposed part 4 of the superconductive material 2 is formed in both upper and lower parts of a wire rod along the longitudinal direction. This part is subjected to heat treatment in an atmosphere containing oxygen, causing a reaction among respective elements in the material powder 2, and the superconductive material 2 constituting of a Y-Ba-Cu-O system or the like is formed. Afterward, rolling is carried out and thereby the green compact 2 and the metallic sheath 3 are joined together, and wire drawing takes place. The superconductive wire formed like this is supplied with ample oxygen at time of the heat treatment so that superconductive performance is improved.
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