Niobium tubes, niobium rod and NbTi alloy are applied in superconductor application. Nb tubes of OD 21mm is for MgB2 superconducting wire application.
Mixed powers Mg+Br are put inside the niobium tubes. The Nb tubes are covered by the multiple tubes like Cu & Monel. And the outer Cu & Monel tube play a stabilizer role. After that they should be extruded three or four times. Combined with Cu & Monel tube, Nb tubes and Mg+Br powers, they are finally drawn into diameter 1.0mm MgB2 superconducting wire without disconnection. NbTi alloy of OD 62mm & Nb tube of OD63.5mm & OD38.5mm is for NbTi superconducting wire application. Nb rod is for Nb3Sn superconducting wire application.