| 摘要 |
PURPOSE:To prevent the occurrence of cracks in the outside of a coil by rolling a composition in making it pass through between a pair of different diameter rolls, at the same time, plastic-deforming it into a coil form. CONSTITUTION:Provisional baked powders 6 for a superconductor, in which a polycrystalline substance of YBa2Cu3O7-delta obtained by mixing with each predetermined material powder and provisionally baking them is ground and finely powdered, are filled into a metallic sheath 3, and they are elongation-worked into a composite wire by swaging process, furthermore, rolled into a tape form by rolling. And, it is rolled by a rolling process in use of a pair of different diameter rolls 1, 2, at the same time, molded into a spiral coil from. A composition 4 molded herein is wound up by a guide rod 7 immediately and wound over into 5 layers. Next, in order to ceramic-bake the provisionally baked powders 6 of a superconductor in the coil, a heat treatment therefor is conducted in an oxidizing atmosphere. |
