Fabrication and properties of monofilamentary MgB2 superconducting tapes
Fabrication and properties of monofilamentary MgB2 superconducting tapes
复制标题
单丝MgB2超导带的制备及性能
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
G. Volpini
中科院分区：
文献类型：
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作者：
G. Grasso;A. Malagoli;M. Modica;A. Tumino;C. Ferdeghini;A. Siri;C. Vignola;L. Martini;V. Previtali;G. Volpini
镍护套的MgB 2超导体带材的制备通过粉末管的方法与单芯配置的超导体。金属管填充有商业反应粉末，并分别通过轧槽、拉拔和轧制冷加工成约4 mm宽和0.35mm厚的平带。所制造的导体的部分在氩气气氛中在高达940 °C的温度下进行热处理。导体的特征在于通过运输测量，以确定磁场的依赖性的临界电流密度，不可逆线，以及建立一个初始的热机械处理和载流能力的制造的MgB 2样品之间的关系。我们针对低场操作进行优化的样品在4.2 K、1 T下的临界电流密度至少为4 × 105 A cm-2。然而，本研究的主要结果是，最佳的热处理条件的变化，如果MgB 2导体必须分别用于低或高场操作。最后，本文还报道了首次成功地演示了较长的MgB 2带材的载流能力。
Nickel-sheathed MgB2 tapes were fabricated by means of the powder-in-tube method with a monocore configuration of the superconductor. The metallic tubes were filled with commercial reacted powders and cold-worked, respectively, by groove rolling, drawing, and rolling to flat tapes of about 4 mm in width and 0.35 mm in thickness. Portions of the manufactured conductors were heat-treated in an argon atmosphere at temperatures up to 940 °C. Conductors were characterized by transport measurements to determine the magnetic field dependence of the critical current density, the irreversibility line, as well as to establish an initial relationship between the thermo-mechanical treatment and the current carrying capacity of the manufactured MgB2 samples. Our optimized samples for the low field operation carry a critical current density of at least 4 × 105 A cm−2 at 4.2 K, 1 T. The main outcome of this study, however, is that the optimal heat treatment condition changes if the MgB2 conductor has to be employed respectively for a low- or high-field operation. Finally, the first successful demonstration of the current carrying capability of longer MgB2 tapes is also reported in this paper.