| 简介 |
PROBLEM TO BE SOLVED : To provide a method of manufacturing an Re-based (123) superconductor in a form of a thick film tape with a high critical current value.
SOLUTION : After forming a calcination film of a YBCO superconductor by repeating 16 times a step of applying a material solution containing trifluoroacetates of Y and Ba and naphthenate of Cu in proportion of Y : Ba : Cu=1 : 1.5 : 3 onto an oriented Ni-W substrate and heating them, a crystallization heat treatment is performed through a temperature raising process from a room temperature to a crystallization heat treatment temperature of 730°C, followed by a subsequent isothermal process. Water vapor is introduced into a furnace at a water vapor partial pressure of 1.05 vol% at the heat treatment temperature of 500°C, the water vapor partial pressure is increased to 2.6 vol% at 690°C before reaching the maximum heat treatment temperature, and then the water vapor partial pressure is further increased to 4.2 vol% stepwise when 30 minutes have passed after reaching the maximum heat treatment temperature of 730°C to retain this water vapor partial pressure during the isothermal process. A Jc value of the YBCO oxide superconductor is 1.48 MA/cm2 at a film thickness of about 2.0 μm.
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