美国高新技术研究所(HTR)采用连续装管成型(CTFF)粉末装管技术(PIT)制备了MgB2/Fe复合线.目前已制备出直径为1.2mm的先驱线(包Fe的Mg+B混合粉),长度达70m.在800℃～950℃处理3min～30min的短样品,传输临界电流密度(Jc)在4K/4T下达到(2～3)×104A/cm2,在4K/2T下达到4×104A/cm2,在4K自场下外推的Jc最少达到2×105A/cm2.用磁测量方法得到的Jc与外推得到的传输临界电流值差不多.
The continuous tube filling/forming(CTFF) powder-in-tube (PIT) technique was employed at Hyper Tech Research (HTR) for the continuous processing of MgB2/Fe composite strand. Demonstration lengths of up to 70m of 1.2mm diameter precursor strand-an Fe-clad Mg+ B elemental powder mixture-have so far been produced. Short samples of this strand, heat treated for 3min～ 30 min/800℃～ 950℃ , have yielded transport critical current densities (Jc) of (2～ 3)× 104 A/cm2 at 4K/4T, 4× 104 A/cm2 at 4K/2 T, and at 4 K in self field an extrapolated Jc of at least 2× 105 A/cm2. Magnetic Jc is extracted, and found to be comparable to the extrapolated transport values.
参考文献
| [1] | Grasso G;Malagoli A;Ferdeghini C;Roncallo S,Braccini V,Siri A S.Large Transport Critical Currents in Unsintered MgB2 Superconducting Tapes[J].Cond-Mat/0103563 |
| [2] | Kumakura H;Matsumoto A;Fujii H;Takano Y, Togano K .Fabrication and Superconducting Properties of Powder-in-tube Processed MgB2 Tapes and Wires[J].Advances in Cryogenic Engineering Materials,2002(48):836-845. |
| [3] | Cooley L D;Eom C B;Hellstrom E E;Larbalestier D C.Potential Application of Magnesium Diboride for Accelerator Magnet Applications[A].Chicago:IEEE-to be published |
| [4] | Buzea C;Yamashita T .Review of Superconducting Properties of MgB2[J].Superconductor Science and Technology,2001,14:R115-R146. |
| [5] | Jin S;Mavoori H;Bower C;Dover R B Van .High Critical Currents in Iron-clad Superconducting MgB2 Wires[J].Nature,2001,411:563-565. |
| [6] | Sumption M D;Peng X;Lee E;Tomsic M,Collings E W .Transport Current in MgB2 Based Superconducting Strand at 4.2K and self-field[EB/OL].http://xxx.lanl.gov/abs/cond-mat/0102441 |
| [7] | Soltanian S.;Kusevic I.;Babic E.;Li AH.;Qin MJ.;Horvat J. Liu HK.;Collings EW.;Lee E.;Sumption MD.;Dou SX.;Wang XL. .High-transport critical current density above 30 K in pure Fe-clad MgB2 tape[J].Physica, C. Superconductivity and its applications,2001(2):84-90. |
| [8] | Goldacker W;Schlachter S I;Zimmer S;Reiner H .High Transport Currents in Mechanically Reinforced Wires[J].Advances in Cryogenic Engineering Materials,2002(48):864-871. |
| [9] | H. Kumakura;A. Matsumoto;H. Fujii;K. Togano .High transport critical current density obtained for powder-in-tube-processed MgB_(2) tapes and wires using stainless steel and Cu-Ni tubes[J].Applied physics letters,2001(15):2435-2437. |
| [10] | Sumption M D;Lee E;Collings E W;Wang X L,Dou S X .Suppression of AC (hysteretic) Loss by Magnetic Shielding of MgB2/Fe Superconductors: the Pseudo-Meissner Effect[J].Advances in Cryogenic Engineering Materials,2002(48):824-831. |
| [11] | Collings E W;Sumption M D;Carr W J .Hysteretic Method of Lower Critical Field Determination in High-Tc Superconductors[J].Superconductor Science and Technology,1992,5:S248-S255. |
| [12] | Collings E W;Lee E;Sumption M D;Tomsic M, Wang X L, Soltanian S, Dou S X.Continuous-and Batch-Processed MgB2/Fe Strands-Transport and Magnetic Properties[J].Physica C,2002 |
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