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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-situ PIT)制备了千米量级7芯导体结构的MgB2/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Φ1.4mm;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2.5×104 A/cm2.结果表明该工艺能够制备实用化高性能的MgB2线带材.
Non-magnetic Nb as the center reinforcement and barrier material, oxygen-free copper as a stabilizer wrap material, in-situ PIT using in-situ PIT prepared kilogram-level 7 core conductor structure of MgB2 / Nb / Cu superconducting wire strip. Due to the good shapeability of the Nb / Cu cladding material, the intermediate annealing heat treatment is not carried out in the whole process. The composite multi-core wire is finally processed to Φ1.4mm. In the vacuum heat treatment furnace The microstructure, superconductivity, longitudinal current distribution uniformity and mechanical properties at room temperature were analyzed and tested on the sintered wire after it was incubated at 680 ℃ for 2 hours.When the critical current density of the strip was at 20K, 1T magnetic field Under the conditions of 2.5 × 104 A / cm2.The results show that the process can prepare practical high performance MgB2 wire strip.