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Recently the interest about Bi-2212 round wire superconductor for highmagnetic field use has been enhancing despite the fact that an increase of thecritical current is still needed to boost its successful use in suchapplications. Recent studies have demonstrated that the main obstacle tocurrent flow, especially in long wires, is the residual porosity inside thesePowder-In-Tube processed conductors which develops in bubbles-agglomerationwhen the Bi-2212 melts. Through this work we tried to overcome this issueacting on the wire densification by changing the deformation process. Here weshow the effects of groove-rolling versus drawing process on the criticalcurrent density JC and on the microstructure. In particular, groove-rolledmultifilamentary wires show a JC increased by a factor of about 3 with respectto drawn wires prepared with the same Bi-2212 powder and architecture. We thinkthat this approach in the deformation process is able to produce the requiredimprovements both because the superconducting properties are enhanced andbecause it makes the fabrication process faster and cheaper.

Large critical current density improvement in Bi-2212 wires through groove-rolling process