Large transport critical currents in unsintered MgB2 superconducting tapes
Large transport critical currents in unsintered MgB2 superconducting tapes
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DOI：
10.1063/1.1384905
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发表时间：
2001-03
影响因子：
4
通讯作者：
Giovanni Grasso;A. Malagoli;C. Ferdeghini;S. Roncallo;V. Braccini;A. Siri;M. R. Cimberle
中科院分区：
文献类型：
--
作者：
Giovanni Grasso;A. Malagoli;C. Ferdeghini;S. Roncallo;V. Braccini;A. Siri;M. R. Cimberle
管中粉工艺已被用于制备具有较强金属护套的带状导体，该导体是以新发现的MgB_2超导相为基础的。将反应后的MgB_2粉末包裹在纯的银、铜和镍管中，然后经拉拔和轧制后进行冷加工，制得了长超导带材。这种带材的传输性能与在高压和高温条件下烧结的块状MgB_2样品一样好。在4.2K下，镍套单丝导体的临界电流密度达到最高值105A/cm2。观察到非烧结带的护套抗拉强度与临界电流之间存在直接的关系。
The powder-in-tube process has been employed to fabricate tape-like conductors with a strong metallic sheath and based on the newly discovered MgB2 superconducting phase. Long superconducting tapes have been prepared by packing reacted MgB2 powders inside pure Ag, Cu, and Ni tubes which are then cold worked by drawing and rolling. Such tapes have shown transport properties as good as bulk MgB2 samples sintered in high pressure and high temperature conditions. At 4.2 K, the highest critical current density of 105 A/cm2 has been achieved on nickel-sheathed single-filament conductors. A direct correlation between the sheath tensile strength and the critical current of the unsintered tape has been observed.