Texture characterization of powder-in-tube Ti/MgB2 superconducting cables

MELONE MAURO; CABRERA ANALÍA; MALACHEVSKY MARÍA TERESA; MALAMUD FLORENCIA; VIZCAINO PABLO; BIANCHI DANIEL; SERQUIS ADRIANA

Simposio; LATIN AMERICAN SYMPOSIUM ON SOLID STATE PHYSICS; 2018

The MgB2superconductor has great potential for technological applications based on its critical temperatureTc (39 K), low cost of the raw materials, chemical simplicity and low anisotropy. Powder-in-Tube (PIT) is themost used method to obtain superconducting cables due to its brittleness. In this work, we employed grade 2titanium as sheath material and a mixture of 95 at%MgB2(325 mesh, Alfa Aesar) and 5 at%SiC (20-30nm) to assemble the superconducting cables. The set was laminated and / or drawn to decrease its diameter[1]. Several configurations were mounted in order to achieve better mechanical stability and flexibility from theobtained cables. The starting filaments are placed in a compact array within a titanium sheath and the rollingand / or drawing process is repeated with intermediate recrystallization heat treatments. The starting filamentwas drawn with a hexagonal cross section to maximize compaction of the multifilamentary cable. Cables wereprepared with arrangements of 7, 19 and 37 filaments.We evaluated the titanium tube for the presence of texture induced by the deformation during drawing usingXRD pole figures. We compared the state of the monofilamentary cable sheath with that of the multifilamentarycables to determine the effect of a greater degree of deformation arising from the thermomechanical treatment.The critical current density of the cables was evaluated using a SQUID magnetometer