摘要
Long dense MgB2 wires were successfully fabricated through the in situ powder-in-tube method by using steel sheath with low carbon content. Short samples of MgB2/Fe wires were sintered at 650-850 °C for 2-5 h in argon. Critical current density (Jc) of the wires was measured in the temperature range of 4.2-30 K in the magnetic field up to 3 T by standard four probe method. High Jc values of 1.3 × 105 A/cm2 in self-field and 7.5 × 104 A/cm2 in 1 T at 15 K were obtained for MgB2/Fe wires. The microstructure observation for MgB2 wires shows that no reaction between Fe and MgB2 was found and MgB2/Fe wires have better grain connectivity and higher density than MgB2 bulk samples. The grain connectivity in wires is better than MgB2 bulk samples. The results indicate that the Jc can be further improved to meet the requirement for applications by optimizing the process conditions.
源语言 | 英语 |
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页(从-至) | 607-610 |
页数 | 4 |
期刊 | Physica C: Superconductivity and its Applications |
卷 | 386 |
DOI | |
出版状态 | 已出版 - 15 4月 2003 |
已对外发布 | 是 |
活动 | ICMC 2002 - Xi an, 中国 期限: 16 6月 2002 → 20 6月 2002 |