| 摘要 |
PURPOSE:To increase the critical current density by forming a molten metal including elements to compose an oxide superconductor in a specific composition ratio, solidifying the molten metal into a solid, filling the solid or only the surface separated from the solid in a metal tube, and then processing it. CONSTITUTION:Elements to compose an oxide superconductor are mixed to make a specific composition ratio. Then the mixture powder is baked temporarily and powdered, and the resultant powder is sintered intermediately to obtain an oxide superconductive powder. After that, the oxide superconductive powder is poured in a crucible, heated, and fused to obtain a molten metal. Then, the molten metal is cooled suddenly to solidify, and the resultant solid is cooled up to the room temperature. Then, only the surface part of the solid is scraped to get a powder. The powder is pressured to make a rod-form body 1, which is inserted to a metallic tube body 2 to form a composite 3. Then, the composite 3 is cold-forged to reduce the diameter, and to the resultant composite consolidated body 13, a sheath removal process and the final sintering process are applied to make an oxide superconductor. Furthermore, the powder of the purer composition ratio is picked up from the surface of the solidified body, and a superconductor is manufactured from the powder. |
