PURPOSE: To raise current density and to lessen reduction in critical current density by magnetic field, by orientating specific oxide superconductor powder in the direction to send electric current in plane C of crystal.
CONSTITUTION: Carbonates, oxides, etc. of Bi, Sr, Ca and Cu are blended so as to make an atomic ratio of 2:2:2:3 or Tl, Ba, Ca and Cu are blended in an atomic ratio of 2:2:1:2 or 2:2:2:3, calcined in an oxygen atmosphere at ≥the melting point, ground, burnt and ground to give oxide superconductor powder having ≤1μm average particle diameter. Then the powder is press molded under ≤0.1ton/cm2 pressure, sintered at 800-900°C, plane C of crystal is fixed in the direction to send an electric current to give a superconductor or the powder is packed into a metallic pipe, which is cast, rolled, drawn and the face is reduced to give a superconducting wire having plane C of crystal orientated in the longer direction.
MURASE AKIRA
HORIAGE TOORU
| JPS64617A | 1989-01-05 | |||
| JPS6471021A | 1989-03-16 |