A method of manufacturing a rare earth oxide superconducting wire

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PROBLEM TO BE SOLVED : To introduce a flux pinning point into an oxide superconductor while controlling water vapor partial pressure in a temperature rising process in crystallization heat treatment. SOLUTION : A manufacturing method includes the steps of applying a raw material solution containing metallic organic acid salts of Y, Ba, Cu and Dy at a molar ratio of Dy/Y=0.1 onto a composite substrate in which a Gd2Zr2O7layer and a CeO2layer are formed on an orientation Ni-W substrate 1, performing calcination heat treatment, and then performing crystallization heat treatment in a temperature rising process from room temperature to a crystallization temperature of 730°C and a constant temperature process at crystallization heat treatment temperature under pressure of less than 50 Torr. The temperature rising process is introduced into a furnace at 500°C and the steam partial water vapor pressure of 1.05 vol.%, the flux pinning point can homogeneously be scattered by continuously increasing the water vapor partial pressure to 4.2 vol.% up to 690°C, and this YBCO oxide superconductor shows an Ic value of 100 A/cm-width and a magnetic field application angle dependence of Jc, min/Jc, max=0.8(1T). COPYRIGHT : (C)2011, JPO&INPIT