| 摘要 |
PURPOSE:To prevent oxygen from enclosing in a metal coverage in a hot or cold process after a specific processing and to prevent an expansion generated in the metal membrane by filling an oxide superconductor powder in an oxygen permeable tube, applying a surface reduction process at a specific temperature, and releasing the oxygen in the crystals of the oxide superconductor, which is liable to be released, in a hot processing. CONSTITUTION:An oxide superconductor powder is filled in an oxygen permeable metal tube, a surface reduction process is applied at 750 to 900 deg.C, and the oxygen in the crystals of the oxide superconductor which is liable to be released is released. Then a wiredrawing process is carried out to a specific outer dimension, heat treatments are applied at 850 to 950 deg.C and at 400 to 600 deg.C in the oxygen ambiance, and the oxygen is led to the oxygen-short rooms in the crystals of the oxide superconductor. As the oxygen permeable metal tube, silver, gold, platinum, or an alloy of them is used. And the oxide superconductor is made of a perovskite structure oxide superconductor including Y, La, and a rare earth element. In such a way, the generation of expansion in the metal membrane owing to the heat treatments is prevented, and the generation of bores and cracks is suppressed. |
