王庆阳,张可荣,杨芳,熊晓梅,郗丹,潘熙锋,冯建情,闫果,冯勇,张平祥.19芯MgB2/NbCu/Monel超导线材的制备及性能研究[J].稀有金属材料与工程,2019,48(10):3320~3324.[WANG Qingyang,Zhang Kerong,Yang Fang,Xiong Xiaomei,Xi Dan,Pan Xifeng,Feng Jianqing,Yan Guo,Feng Yong,Zhang Pingxiang.Fabrication and properties of 19-filament MgB2/NbCu/Monel superconducting wires[J].Rare Metal Materials and Engineering,2019,48(10):3320~3324.]
19芯MgB2/NbCu/Monel超导线材的制备及性能研究
投稿时间:2018-04-27  修订日期:2018-05-15
中文关键词:  二硼化镁  多芯线材  微观结构  机械性能  超导性能
基金项目:国家自然科学基金(51372207,51772250);陕西省自然科学基金(2017ZDJC-19);国家重点研发计划(2017YFB0902303)
中文摘要:
      为了提高多芯MgB2超导线材的强度并避免加工过程中的断芯、断线现象,实验中采用强度较高的梦乃尔合金(Monel 400)作为外包套材料,以原位法粉末装管工艺(in situ PIT)制备了19芯导体结构的多芯MgB2超导线材。二次集束组装后的多芯复合线材通过拉拔、轧制和中间退火热处理相结合的方法从Φ25 mm加工到Φ1.0 mm。对加工过程不同阶段的多芯复合线材进行了微观结构分析,发现多芯线材中MgB2芯丝分布较为规整,Nb阻隔层表面较为光滑,未出现明显破损现象。最终Φ1.0 mm的多芯线材中MgB2超导芯丝的平均直径约为100 μm。热处理后MgB2线材的抗拉强度和屈服强度分别达到396 MPa和200 MPa。MgB2线材的临界电流密度在4.2 K、4 T时达到1.23×105 A.cm-2
Fabrication and properties of 19-filament MgB2/NbCu/Monel superconducting wires
英文关键词:MgB2 wire, multi  filament, microstructure, mechanical  properties, supercongducting
英文摘要:
      For improving the mechanical properties and avoiding the filament fractures or wire breaks in multi filament MgB2 wire, the traditional in-situ powder in tube (PIT) method was introduced to the MgB2 wires fabrication process using the Monel alloys with higher strenth as the outer sheath materials. MgB2 wire with the conducting structure of 19 filaments was fabricated by the PIT method. Multi-filament compound billet is processed from Φ25 mm to Φ1.4 mm in diameter with drawing, rolling and annelling process. Superconducting filament is uniformly distributed and the thickness of Nb diffusion barrier is also smooth without breaking points through the microstructure analysis of the wires at each fabrication stages. The mean diameter in MgB2 supercongducting cores is aroung 100 μm in final wires with the diameter of Φ1.0 mm. The tensile strength and yield strength of the wire heat-treated at 670℃/2h is around 396 MPa and 200 MPa respectively. The critical current density (Jc) is arrived 1.23×105 A.cm-2 at 4.2 K、4 T.
作者单位E-mail
王庆阳 西北有色金属研究院 wqy233@sina.com 
张可荣 西藏民族大学信息工程学院  
杨芳 西北有色金属研究院  
熊晓梅 西北有色金属研究院  
郗丹 西部超导材料科技股份有限公司  
潘熙锋 西部超导材料科技股份有限公司  
冯建情 西北有色金属研究院  
闫果 西部超导材料科技股份有限公司  
冯勇 西部超导材料科技股份有限公司  
张平祥 西北有色金属研究院西部超导材料科技股份有限公司  
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