Texture characterization of powder-in- tube Ti/MgB 2 superconducting cables

MELONE MAURO; CABRERA, ANALÍA; MALACHEVSKY, MARÍA T.; MALAMUD, FLORENCIA

Simposio; XXIII Latin American Symposium on Solid State Physics; 2018

The MgB 2 superconductor has great potential fortechnological applications based on its critical tempe-rature Tc (39 K), low cost of the raw materials, che-mical simplicity and low anisotropy. Powder-in-Tube(PIT) is the most used method to obtain supercon-ducting cables due to its brittleness. In this work, weemployed grade 2 titanium as sheath material and amixture of 95 at % MgB 2 (325 mesh, Alfa Aesar) and5 at % SiC (20-30 nm) to assemble the superconduc-ting cables. The set was laminated and / or drawn todecrease its diameter [1]. Several configurations weremounted in order to achieve better mechanical sta-bility and flexibility from the obtained cables. Thestarting filaments are placed in a compact array wit-hin a titanium sheath and the rolling and / or dra-wing process is repeated with intermediate recrysta-llization heat treatments. The starting filament wasdrawn with a hexagonal cross section to maximizecompaction of the multifilamentary cable. Cables wereprepared with arrangements of 7, 19 and 37 filaments.We evaluated the titanium tube for the presence oftexture induced by the deformation during drawingusing XRD pole figures. We compared the state of themonofilamentary cable sheath with that of the multi-filamentary cables to determine the effect of a greaterdegree of deformation arising from the thermomecha-nical treatment.The critical current density of the cables was eva-luated using a SQUID magnetometer.