7芯复合包套Ba1-xKxFe2As2线带材的显微结构与超导性能研究
Microstructure and Superconducting Properties of 7-Filament Ba1-xKxFe2As2 Composite Conductors
农小嶢 1王之罕 1陈文武 1李健伟 1杨璐安 1金浩 1林鹤 1潘熙锋1
作者信息
- 1. 福建师范大学物理与能源学院,福建福州 350117;福建省先进高温超导材料工程研究中心,福建福州 350117
- 折叠
摘要
传统Ag包套与铁基超导材料具有良好的化学相容性以及塑性加工特性,但是其机械强度低;而采用复合包套来制备高强度Ba1-xKxFe2As2铁基多芯线带材是一种直接高效且成本低廉的方法.本研究选取高强度高延展性的Ag/Nb/Cu 3层复合包套,从线带材包套尺寸、冷加工工艺和中间退火等方面进行优化,获得了结构稳定且易于加工的Ba1-xKxFe2As2多芯线带材.Ag/Nb/Cu复合包套Ba1-xKxFe2As2线带材的多芯孔型完整并且分布均匀,超导填充因子约为25.3％～28.0％,并且具有较好的力学性能.Ba1-xKxFe2As2多芯带材的转变Tc为37.5 K,M-H曲线表明样品具有较强的内在磁通钉扎能力.在4.2 K和2T下其传输Jc约为1.7×104A/cm2,在10 T时传输Jc仍然保持为8.7×103A/cm2.
Abstract
The traditional Ag sheath has both good chemical compatibility and plastic processing characteristic with iron-based superconductors(IBS),but it possesses too low mechanical strength.Employing composite sheathes is a direct,efficient and low-cost method to prepare high strength Ba1-xKxFe2As2 conductors.In this study,the Ba1-xKxFe2As2 multifilamentary wires/tapes with stable structure and large ductility were obtained through optimizing the sheath size,cold deformation and intermediate annealing.It is found that the shape distribution of multi-cores is uniform,and the superconducting filling factor is 25.3％-28.0％for this Ag/Nb/Cu composite sheathed Ba1-xKxFe2As2 superconductors.The magnetic critical transition temperature Tc of Ba1-xKxFe2As2 tape is up to 37.5 K,and the magnetization of hysteresis loops(M-H)shows a strong flux pinning ability.The transport critical current density Jc of Ba1-xKxFe2As2 tape is about 1.7× 104 A/cm2at 4.2 K and 2 T,and it still holds 8.7×103 A/cm2 at 4.2 K and 10 T.
关键词
Ba1-xKxFe2As2多芯线带材/复合包套/导体结构/超导性能Key words
Ba1-xKxFe2As2 multifilamentary wires/tapes/composite sheath/conductor structure/superconducting properties引用本文复制引用
基金项目
福建省自然科学基金(2020J06018)
福建省自然科学基金(2022J01182)
出版年
2024
NETL
NSTL
万方数据