| 摘要 |
PURPOSE:To realize a ceramic superconductor which is excellent in superconducting characteristics even in a strong magnetic field by heating and melting raw materials for the ceramic superconductor, then rapidly cooling and solidifying the melted materials to pulverize them into powder, and processing the powder into a compact, and heating and melting the compact in an oxygen-containing atmosphere to unidirectionally solidify it. CONSTITUTION:For example, powders of Y2O3, BaCO3, and CuO are used as starting materials and mixed together, and thereafter the mixed powder is calcined in the atmosphere. This calcined powder is then put into a crucible and heated and melted by means of an electric furnace. After this melted body is rapidly cooled and solidified while sandwiched between two iron plates, it is granulated with a hammer. This granulated body is put into an automatic mortar and pulverized into powder. The pulverized powder of the rapidly cooled and solidified body is pressed into a rod-shaped compact. Then this rod-shaped compact is passed through the electric furnace under atmospheric conditions and unidirectionally solidified so that a ceramic superconductor can be manufactured. |
