以无磁性的Nb作为中心增强体和阻隔层材料，无氧铜作为稳定体包套材料，采用原位法粉末装管工艺（in-situPIT）制备了千米量级7芯导体结构的MgPe／Nb／Cu超导线带材，由于Nb／Cu包套材料具有良好的塑形加工性能，整个加工过程中未进行中间退火热处理，复合多芯线材最终加工到圣1．4mm；在真空热处理炉中680℃保温2小时进行成相热处理；对烧结后的线材进行了微观结构、超导电性、纵向电流分布均匀性及常温力学性能等分析检测．线带材的工程临界电流密度在20K，1T磁场条件下达到2．5×10^4A／cm^2．结果表明该工艺能够制备实用化高性能的MgB2线带材．
Kilometer level 7-filamtntary MgB2/Nb/Cu wires and tapes was fabricated by in-situ powder-in-tube （PIT） method using non-magnetic Nb as the barrier and reinforced materials, and Oxygen Free High Conductivity copper （OFHC） as the stabilizer. There is no any annealing in the whole fabrication process due to the excellent ductility of Nb/Cu composite tube. The composite wire was fabricated to the target size of 1.4 mm in diameter and heat treated at 680℃ for 2 hours in a vacuum furnace. Microstructure, superconductivity, room temperature mechanical properties and homogeneity of critical current were measured respectively. The transport engineering critical current density （J∞） reaches 2. 5 ×10^4 A/cm^2 at 20K, 1T. The results show a good potential to fabricate high perforrnanee MgB2 wires and tapes at ambient pressure for practical application.
参考文献
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