PURPOSE: To obtain uniform, dense superconducting fiber suitable for cable and wire, having high critical current density, excellent handleability by adding an organic acid and spinning auxiliary to acetates of specific metals to give an aqueous solution, concentrating, spinning and burning.
CONSTITUTION: Acetates of Ln, X and Cu (Ln is Sc, Y, La, Ce, Pr, Nd, pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu; X is Ba, Sr and Ca) are blended with an organic acid (preferably propionic acid) and a spinning auxiliary (preferably polyvinyl alcohol-based compound) to give an aqueous solution, which is concentrated and spun to give precursor fiber. The precursor fiber is burned (preferably in an air or in an inert gas atmosphere in a lowtemperature range at ≤ the decomposition temperature of the organic substance at 0.2-10°C/minute rate of heating and then in an air or in an oxygen atmosphere in a temperature range at ≥ the decomposition temperature at 1-40°C/minute rate of heating) to give superconducting fiber.
SUGISHITA TAKAAKI
SUZUKI SHIROU
