| 摘要 |
PURPOSE:To improve the critical temperature and the superconductive property by forming a core material in a specific shape, and covering the core material with a superconductive coverage layer. CONSTITUTION:A core material is formed in a specific shape beforehand, and the specific shape of core material is covered with a superconductive coverage layer which consists of a superconductive material. The core material may be of either a wire form or a ribbon form, and the shape of the core material shall be a specific form such as a plane coil, a spiral, or a herical coil, responding to the purpose of the superconductive wire material. As the quality of the core material, a metallic material such as Cu, W, Pt, Al, or Fe, a carbon fiber, or the like, for example, which is a flexible material, is used, and its thermal expansion coefficient shall be equal to or less 10 % than that of the superconductive coverage layer. Concretely, Pt, Fe, Ni steel or the like is used. Consequently, by using an oxide type ceramics superconductive material with a high critical temperature and without ductivity, flexibility, and the like, a specific shape of superconductive wire material can be obtained.
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