Iron-Based Superconductors for High-Field Applications: Realization of High Engineering Critical Current Density.

IF 3.1 3区材料科学 Q3 CHEMISTRY, PHYSICAL

Materials Pub Date : 2024-10-31 DOI:10.3390/ma17215306

Peng Yang, He Huang, Meng Han, Cong Liu, Chao Yao, Yanwei Ma, Dongliang Wang

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Abstract

Iron-based superconductors have strong potential for magnet applications through their very high upper critical field, low anisotropy and manufacturability through the powder-in-tube (PIT) route. The engineering critical current density (J_e) is a key parameter for measuring the maximum current density that superconducting materials can withstand in practical applications. It serves as a bridge between theoretical research and practical applications of superconductors and has great significance in promoting the development and application of superconducting technology. In this study, Ag sheathed Ba_0.6K_0.4Fe₂As₂ (Ba-122) iron-based superconducting tapes were prepared by using the process of drawing, flat rolling and heat treatment by hot pressing (HP). For the first time, the filling factor of the tapes increased to about 40%, leading to a reduction in the volume fraction of Ag, consequently lowering the overall cost. The optimal parameters for achieving high transport J_e were obtained by comparing the effects of different HP pressures on the properties and micro-morphology of the tapes. The prepared mono-filament tapes are capable of carrying the transport J_e of 4.1 × 10⁴ A/cm² (I_c = 350 A) at 4.2 K, 10 T, marking the highest J_e reported for Ba-122 wires and tapes to date. Our results show that high transport J_e can be obtained in Ba-122 superconducting tapes, and iron-based superconductors have a promising future in practical applications.

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用于高磁场应用的铁基超导体：实现高工程临界电流密度。

铁基超导体具有极高的上临界磁场、低各向异性以及可通过管内粉末（PIT）工艺制造的特点，因此在磁体应用方面具有很强的潜力。工程临界电流密度（Je）是衡量超导材料在实际应用中所能承受的最大电流密度的关键参数。它是连接超导体理论研究和实际应用的桥梁，对促进超导技术的发展和应用具有重要意义。本研究采用拉拔、平轧和热压（HP）热处理工艺制备了银护套 Ba0.6K0.4Fe2As2（Ba-122）铁基超导带。铁基超导带的填充系数首次提高到约 40%，从而减少了银的体积分数，降低了总成本。通过比较不同 HP 压力对胶带性能和微观形态的影响，获得了实现高传输效率的最佳参数。制备的单丝带能够在 4.2 K、10 T 条件下承载 4.1 × 104 A/cm2 （Ic = 350 A）的输运 Je，这是迄今为止报道的 Ba-122 导线和带的最高 Je 值。我们的研究结果表明，Ba-122 超导带可以获得很高的传输Je，铁基超导体在实际应用中大有可为。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

5.80

自引率

14.70%

发文量

7753

审稿时长

1.2 months

期刊介绍： Materials (ISSN 1996-1944) is an open access journal of related scientific research and technology development. It publishes reviews, regular research papers (articles) and short communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Materials provides a forum for publishing papers which advance the in-depth understanding of the relationship between the structure, the properties or the functions of all kinds of materials. Chemical syntheses, chemical structures and mechanical, chemical, electronic, magnetic and optical properties and various applications will be considered.