Preparation of Nb3Al Superconducting Tapes by a Powder-in-Tube Method Combined with Hot-Pressed Sintering

The precursors of Nb-Al tape were fabricated by a powder-in-tube (PIT) technique. Supersaturated solid solutions of Nb-Al powder were obtained by high-energy ball milling, followed by a powder-in-tube process to prepare series of Nb3Al precursor tapes. Compared with sintering under normal pressure, the hot-pressing sintering greatly increased the critical current density of the tapes. The results showed that the Nb3Al tapes prepared via the powder-in-tube method and hot-pressed sintering could significantly improve the J (c) performance, and the value of J (c) (8 K, 0 T) was higher than 6 x 10(5) A/cm(2). The Nb3Al tapes after pressing under the pressure of 20 MPa and sintering at 950 C-ay for 3 h had the best magnetic flux pinning performance, and the sample reached the maximum flux pinning force (F (p,max)) of 3.28109 N/m(3) in the magnetic field of 2.2 T.