预复合包套技术制备的高性能(Ba,K)Fe_(2)As_(2)铁基超导带材  

Significant enhancement of transport J_(c) in Cu/Ag-sheathed(Ba,K)Fe_(2)As_(2) superconducting tapes by pre-composite technique

作　　者：李文超 黄河 果辰 涂畅 刘欣源 姚超 张现平 马衍伟 Wenchao Li;He Huang;Chen Guo;Chang Tu;Xinyuan Liu;Chao Yao;Xianping Zhang;Yanwei Ma(Key Laboratory of Applied Superconductivity,Institute of Electrical Engineering,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China;School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,China)

机构地区：[1]Key Laboratory of Applied Superconductivity,Institute of Electrical Engineering,Chinese Academy of Sciences,Beijing 100190,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,China

出　　处：《Science China Materials》2023年第2期801-810,共10页中国科学（材料科学（英文版）

基　　金：supported by the National Key R&D Program of China(2018YFA0704200 and 2017YFE0129500);the National Natural Science Foundation of China(51861135311,U1832213 and 51721005);the Strategic Priority Research Program of Chinese Academy of Sciences(XDB25000000);the Key Research Program of Frontier Sciences of Chinese Academy of Sciences(QYZDJ-SSW-JSC026);the International Partnership Program of Chinese Academy of Sciences(182111KYSB20160014)。

摘　　要：铁基超导材料因具有极高的上临界磁场和较小的各向异性,在高磁场领域具有独特的应用优势.铁基超导材料实用化研究的一个主要目标是制造出低成本和高临界电流密度的超导线材和带材.使用铜银复合包套代替纯银包套制备铁基超导带材可以减少昂贵的银的使用,从而显著降低成本.本文通过预复合工艺制备了(Ba,K)Fe_(2)As_(2)铜银复合包套带材,有效减少了包套中的间隙气体,增强了复合金属包套的界面结合.预复合带材在750℃烧结3 h后,实现了6.2×10^(4)A cm^(-2)(4.2 K,10 T)的高临界电流密度.通过微结构与成分表征发现,高致密度的超导芯、大尺寸晶粒和均匀的元素分布是获得高临界电流密度的主要原因.以上研究结果表明,预复合包套技术为制备高性能、低成本的铁基超导线材和带材提供了一种可行的方法,具有良好的应用前景.Iron-based superconductors(IBSs)have received extensive attention in superconductivity mechanisms and high-field applications based on their ultra-high upper critical fields and low anisotropy.A major goal in the application research of IBSs is the fabrication of superconducting wires and tapes with high critical current density(Jc)and low cost.The use of Cu/Ag composite sheath can reduce the use of expensive silver,thereby reducing the cost of the tapes.In this paper,(Ba,K)Fe_(2)As_(2)(Ba-122)tapes with Cu/Ag composite sheath were fabricated by a pre-composite process,which provides a feasible method for fabricating high-performance iron-based superconducting wires and tapes.Pre-composite tapes sintered at 750℃for 3 h achieved a high J_(c)of 6.2×10^(4)A cm^(-2)at 10 T and 4.2 K.It is found that the high-density superconducting cores,large-size grains and uniform element distribution are the major causes of the high J_(c).The results suggest that the low-cost Ba-122 tapes with pre-composite Cu/Ag sheath have great practical application prospect in the future.

关 键 词：临界电流密度 铁基超导材料 超导线材 带材 元素分布 实用化研究 各向异性 应用优势 

分 类 号：TB33[一般工业技术—材料科学与工程]