| 摘要 |
PURPOSE:To provide a superconductive wire excellent in superconductivity without sintering inflation by filling powder of a bismuth-based oxide superconductor calcinated under a low oxygen atmosphere into a noble-metal tube, and sintering it after flattening if necessary. CONSTITUTION:For example, Bi2Sr2Cu2Oy, Bi2-xPbxSr2Ca2Cu3Ox, etc., are used as powder of oxide superconductors. This powder includes a powder in which another rare earth elements are added, or a powder in which Si is substituted by another alkali earth metals, or a powder in which pinning centers are contained. This powder of the bismuth oxide superconductor is calcinated under a low oxygen atmosphere. Then, powders containing low oxygen content calcinated under the low oxygen atmosphere, or powders containing no oxygen, are filled into a noble metallic tube, or into an elongated metallic tube if necessary. The noble-metal tube, such as a silver tube, a gold tube, a platinum tube, etc., are subjected to a main sintering treatment or a drawing treatment if necessary. |
