WB-9-4

Fabrication of Cu/Ag composite sheathed iron-based superconducting Wires

15:45-16:00　30/11/2023

*Xianping Zhang1,2, Chao Yao1, Cong Liu1, Yanchang Zhu1, He Huang1, Zhiheng Dong1, Dongliang Wang1,2, Yanwei Ma1,2
1. Key Laboratory of Applied Superconductivity, Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China.
2. University of the Chinese Academy of Sciences, Beijing 100049, People’s Republic of China.
Abstract Body

Iron based superconductor(IBS) have significant application potential in high magnetic field region due to their high upper critical field and low anisotropy. To meet the requirements of strong current applications, systematic research has been carried out to improve the critical current density (Jc) of IBS wires. Currently, the Jc of the IBS wires has exceeded the practical threshold, reaching 1.5×105 A/cm2 (4.2 K, 10 T), and the Jc of hundred meter long wires have also reached 6×104 A/cm2 (4.2 K, 10 T). Compared to the commonly used Ag sheath, Cu has high mechanical properties and low price. Using Cu/Ag composite sheath is an optional way to improve the mechanical strength and reduce the cost of IBS wires. In order to improve the performance of Cu/Ag composite sheathed IBS wires, we optimized the powder ratio, sheath thickness, processing technology, heat treatment, and other aspects. The Jc of the ordinary heat treated Cu/Ag composite sheathed IBS tapes reached 4.9×104 A/cm4 (4.2 K, 10 T), and reaches 6.5×104 A/cm2 (4.2 K, 10 T) by means of hot pressed technique. Moreover, the Jc of Cu/Ag composite sheathed IBS tape prepared by hot isostatic pressing process is as high as 1.1×105 A/cm2 (4.2 K, 10 T), demonstrating good application prospects for Cu/Ag composite sheathed wire.

References

1. Kamihara Y, Watanabe T, Hirano M, et al. Iron-based layered superconductor La[O1−xFx]FeAs (x = 0.05−0.12) with Tc = 26 K. J Am Chem Soc, 2008, 130: 3296–3297.
2. Li L, Zhang X, Yao C, et al. Large critical current density in Cu/Ag composite sheathed (Ba,K)Fe2As2 tapes fabricated under ambient pressure. Supercond Sci Technol, 2019, 32: 065008

Acknowledgment

This work was supported by the National Key R&D Program of China (2018YFA0704200), the National Natural Science Foundation of China (51861135311 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), and the International Partnership Program of Chinese Academy of Sciences (182111KYSB20160014).