Method of manufacturing superconductor
AssigneeSumitomo Electric Industries, Ltd.
InventorMaumi Kawashima
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Abstract
According to this method of manufacturing a superconductor, powder materials of Y.sub.2 O.sub.3, BaCO.sub.3 and CuO are first prepared as raw materials and blended and mixed to the composition Y.sub.1 Ba.sub.2 Cu.sub.3 O.sub.x. The mixed powder thus obtained is compression-molded and thereafter sintered. A sintered body thus obtained shows the Meissner effect under the temperature of liquid nitrogen. This sintered body is pulverized into fine particles. A magnetic field is applied to the fine particles at the temperature of liquid nitrogen, thereby to select only superconductive particles. The selected superconductive particles are compression-molded during application of a magnetic field and then sintered, thereby to obtain a superconductor having high critical current density.
Claims4
A method of manufacturing a superconductor of composition Y.sub.1 Ba.sub.2 Cu.sub.3 O.sub.x with a critical current density J.sub.C at a temperature of 77k and magnetic flux density of O T (tesla) of about 1200 A/cm.sub.2, said superconductor having anisotropic conducing axes, comprising the steps of:
- blending, mixing and solidifying raw materials for a superconductor of composition Y.sub.1 Ba.sub.2 Cu.sub.3 O.sub.x with a critical current density J.sub.C at a temperature of 77k and magnetic flux density of O T (tesla) of about 1200 A/cm.sub.2, so that a solid body thus obtained at least partially shows superconductivity at a temperature less than a critical temperature;
- pulverizing said body into the fine particles;
- applying a magnetic field to said fine particles at a temperature below the critical temperature, and selecting superconductive particles;
- and
- compression molding said superconductive particles thus selected while applying a magnetic field, and sintering the same.
Dependencies are inferred from the claim text.