The composition of niobium-titanium superconducting alloy material should meet the requirements of Tc, Hc2 and Jc as high as possible, generally in the range of Nb-(40% ~ 55%)Ti. This kind of gold component can not only get high Tc and Hc2, but also produce superconducting material with high current carrying capacity and large amount of precipitated phase. There are six grades of niobium titanium alloy superconducting materials used in the world: Nb-44Ti, Nb-46.5Ti, Nb-48Ti, Nb-50Ti, Nb-53Ti, Nb-55Ti and so on, among which Nb-46.5Ti and NB-50Ti are widely used alloy component grades.
Manufacturing process A typical technology for the international industrial production of niobium-titanium superconducting materials is: The high uniform alloy ingot processing, heat treatment to get a diameter of 3mm Nb-Ti rod, in the Nb-Ti rod coat is a circular outer hexagonal oxygen free copper tube, hundreds to several or more of this composite rod installed in the diameter of 250 ~ 300mm oxygen free copper sheath, electron beam welding seal, extrusion at 500℃ into φ50 ~ 70mm composite rod. The composite rod was drawn at room temperature with a pass rate of 20%, and was aged at 350 ~ 420℃ for 4 ~ 6 times. After twisted and twisted, the wire with the final size φ 0.5 ~ 1mm was made.
Niobium-titanium superconducting materials have been used in superconducting high-energy accelerator, superconducting NUCLEAR magnetic resonance imaging diagnostic instrument, superconducting magnetic levitation high-speed train, superconducting high intensity magnetic separator and other large devices. Also in controlled nuclear fusion, magnetic fluid power generation, generators, power transmission, energy storage and other energy development applications. In addition, in the strong magnetic propulsion system (ships, ships, high-speed launch devices) and military defense and other applications. In short, plastic niobium-titanium alloy superconducting material plays an important role in large superconducting applications, and it is the most used superconducting material (> 95%) in the world.
