Niobium titanium alloy (Nb-Ti), as the most mature and practical superconducting material at present, dominates the field of low-temperature superconductivity. The following is a detailed analysis of its superconducting properties, core applications and technological progress.
The critical parameters of superconducting properties of niobium-titanium alloy: Critical temperature: approximately 9.2K (Nb-47wt%Ti alloy). Critical magnetic field: It can reach 12T at 4.2K and can be increased to 15T through cold working. Critical current density: >3000 A/mm2 (4.2K, 5T), far exceeding pure niobium. Advantages: Excellent mechanical properties: Can be drawn into ultra-fine wires (diameter <1μm), suitable for complex winding requirements. Low cost: and mature processing technology. Microstructure optimization and α-Ti phase regulation: Through cold working (deformation rate >90%) + aging heat treatment (400℃), nanoscale α-Ti precipitated phases are formed, and the magnetic flux is enhanced by ntting. Cu/Nb-Ti multi-core wire improvement: The number of superconducting cores has developed from the thousand-core level to the ten-thousand-core level, reducing AC losses.
New composite conductor Nb-Ti/CuNi: Add a CuNi barrier layer to suppress low-temperature thermal diffusion and is suitable for pulsed magnets. Nb-ti-al: The aluminum matrix improves thermal conductivity and is used for highly stable magnets (such as quantum computing devices). Low-temperature system integration. Direct cooling technology: Directly couple the Nb-Ti coil with the GM refrigeration machine to avoid liquid helium dependence.
