Influences of processing methods on the microstructure and superconducting properties of Bi-2223 superconducting tapes
Bi-2223(Bi2Sr2Ca2Cu3O10)high-temperature superconducting materials wre prepared by the powder-in-tube(PIT)method combined with the drawing process.Instead of the conventional drawing process,the roll-rolling process was used to investigate the effects of different processing methods on the hardness,uniformity,grain texture,and superconducting properties of superconducting wires/strips core wire.The results clearly demonstrate that the roll-rolling process is an effective method for improving the hardness of Bi-2223 superconducting core wire,with an increase of more than 25％.Additionally,the uniformity of the wire core is significantly enhanced.Due to the higher core wire densities of the rolled process wires,less overlap between the core wires after rolling with small single pass deformation,and the highest degree of weaving of the Bi-2223 phase grains in the tapes after heat treatment,the engineering current density J e of the rolled process tapes reaches 4.6 kA/cm2,which is an increase in J e of the strips by about 13％as compared to the conventional drawing process.
High-temperature superconducting tapesGroove rolling processHardnessEngineering current density
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