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低损耗 NbTi 线材制备技术研究
郭强,王瑞龙,朱燕敏,刘建伟,李建峰,刘向宏,冯勇,张平祥
0
(西部超导材料科技股份有限公司, 西安710018; 超导材料制备国家工程实验室超导, 西安710018;西部超导材料科技股份有限公司, 西安710018;超导材料制备国家工程实验室超导, 西安710018;西北有色金属研究院, 西安710016)
摘要:
国内重离子加速器(HIAF)磁体服役在高速脉冲电流下, 要求超导磁体用超导线具有较低的损耗, 并具有高的临界电流, 针对磁体的设计要求, 本文研制了两种新型结构的 NbTi/Cu0.5Mn 超导线, 通过两次组装、 冷拉拔获得了线径Φ0.8 mm、12960 芯和10800 芯、铜比2.0、芯丝小于5 μm 的高临界电流、低损耗超导线, 系统研究了两种新型结构超导线的截面形貌、芯丝形貌、磁滞损耗及不同时效热处理次数超导线的临界电流密度(Jc ) 和n 值, 最后获得了线材芯丝直径和磁滞损耗的变化关系. 研究结果表明, 两种线材经过二次组装、 挤压和冷拉拔后, 单个亚组元成型良好, 芯丝变形粗细均匀, 尺寸大约4 μm. 随着时效热处理次数由3 次增加到5 次, 线材芯丝表面有颗粒状的CuTi 化合物生成, 且5 T、4.2 K 下临界电流密度由2295 A/mm2 增加到2958 A/mm2 , 不同时效热处理次数的线材n 值大小介于30~60 之间, 表明芯丝整体变形均匀. 线径 Φ0.8 mm、12960 芯和10800 芯线材在4. 2 K、±3 T 下的磁滞损耗分别为35.5 mJ/cm3 、42.8 mJ/cm3 , 随着线材芯丝直径由4.6 μm 减小至2.8 μm, 磁滞损耗由42.8 mJ/cm3 降低至17.3 mJ/cm3 . 最后, 通过优化工艺后获得了Jc (5 T、4. 2 K) 为2958 A/mm2 , Qh(4. 2 K,± 3T)为37.5 mJ/cm3 的千米级 NbTi/Cu0.5Mn 超导长线, 并可实现批量化生产.
关键词:  NbTi 超导线材, 临界电流密度, 损耗
DOI:10.13380/j.ltpl.2019.02.010
基金项目:
Study on High Jc and Low AC Losses NbTi/Cu0.5Mn Superconducting Wire for HIAF Magnets
GUO Qiang,WANG Ruilong,ZHU Yanmin,LIU Jianwei,LI Jianfeng,LIU Xianghong,FENG Yong,ZHANG Pingxiang
(Western Superconducting Technologies Co . , LTD , Xi ’an 710018; National Engineering Laboratory for Superconducting Materials , Xi ’an 710018)
Abstract:
In view of the design requirements of the low losses wires for High Intensity Heavy-Ion Accelerator Facility (HIAF) magnets, the two new types of NbTi/Cu0. 5Mn superconducting wires with high critical current and low losses were developed. The research result shows, the filament of the NbTi/Cu0. 5Mn superconducting wire with filaments of 12960 and 10080 have a uniform thickness and a size of about 4 μm which were fabricated by double stacking method. When the aging time in creases from 3 to 5, the critical current density increases from 2295 to 2958 A/mm2 at 5 T&4. 2 K. The ‘n’ value with different aging times are between 30 and 60 under different magnetic fields. This indicats that the overall deformation of the filaments are uniform. The hysteresis loss of the 12960 and 10800 filaments are 35. 5 mJ/cm3 and 42. 8 mJ/cm3 at ±3T&4. 2 K which the wire diameter is Φ0. 8 mm. Meanwhile, when the diameter of NbTi filament reduces from 4. 6 to 2. 8 μm, the hysteresis losses reduces from42.8to 17. 3 J/cm3 at ±3T&4. 2 K. After the process optimization, the NbTi/Cu0. 5Mn superconducting wire with the critical current density of 2958A/mm2 at 5 T&4. 2 K, with the hysteresis of 37. 5 J/cm3 at ±3 T&4.2 K, with the length more than1000m per piece, was achieved in mass production.
Key words:  NbTi, Critical current density, AC losses

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