Preparation of Nb3Al Superconducting Tapes by a Powder-in-Tube Method Combined with Hot-Pressed Sintering
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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 × 105 A/cm2. The Nb3Al tapes after pressing under the pressure of 20 MPa and sintering at 950 ∘C 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/m3 in the magnetic field of 2.2 T.
KeywordsNb3Al superconducting tape Mechanical alloying Powder-in-tube Hot-pressed sintering
The authors are grateful for the financial support of the Sichuan Province Science Program (Grant No. 2017JY0057), the National Natural Science Foundation of China (Grant Nos. 51271155, 51302224, and 51377138), and the Program of International S&T Cooperation (Grant No. 2013DFA51050).
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