REBCO高温超导多芯带材的制备技术及性能研究进展

doi:10.19595/j.cnki.1000-6753.tces.231869

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摘要

二代高温超导稀土钡铜氧（REBCO）带材因具有优异的临界电流密度、高上临界场、高临界转变温度等优点,已逐渐应用在电力交通、科学仪器、聚变能源等高新技术领域。然而,REBCO超导带材具有极大的高宽比（超导带材宽度与厚度的尺寸比）,使得其在应用过程中具有较大的交流损耗和较明显的屏蔽电流效应。为避免高宽比造成的影响,将带材中的超导层采用不同制备技术细分为平行且极窄的“芯丝”,从而将REBCO带材改性为REBCO“多芯带”,目前该领域研究已成为国内外研究者们的关注热点。该文综述了国内外在REBCO多芯带材制备方法与相关性能方面的研究进展。基于目前的制备技术,重点综述了商业化带材多芯改性技术（激光切割、机械切割和化学刻蚀）和REBCO多芯带直接成型技术（喷墨打印、机械划痕、两级轮廓衬底）的制备工艺技术对其性能的影响,总结论述了目前REBCO多芯带材制备技术存在的主要问题及今后发展方向。

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关键词 ： REBCO高温超导多芯带材, 制备技术, 临界电流, 交流损耗, 屏蔽电流效应

Abstract：

The second generation of high-temperature superconducting REBCO tapes has become the focus due to their excellent critical current density, high upper critical field, and high critical transition temperature. At present, it has been gradually applied in important fields such as electric power transportation, scientific instruments, fusion energy and other high-tech fields. However, large AC loss and obvious shielding current effect have been caused by the high aspect ratio (the dimensional ratio of the width to the thickness of the superconducting tape) of REBCO superconducting tapes in practical application. To mitigate the effects caused by the aspect ratio, researchers have adopted various fabrication techniques to divide the superconducting layer within the tape into multiple parallel and extremely narrow "filaments", thus modifying the REBCO tape into a REBCO "multifilamentary tape". This subdivision technique ensures that each individual superconducting filament has a smaller width, effectively reducing the AC losses caused by an excessive width-to-thickness ratio, as well as diminishing the shielding current effect. Therefore, the preparation of REBCO high-temperature superconducting multifilamentary tapes using various techniques has become a focal point of interest among researchers in this field both domestically and internationally.
This article systematically reviews the research progress in the methods of preparing REBCO multi-filamentary tapes and related performance, both domestically and internationally. Based on current fabrication technologies, the first discusses techniques for modifying commercial REBCO tapes into multi-filamentary structures, including laser cutting, mechanical cutting, and chemical etching techniques. Laser cutting technology is noted for its high precision and stability, but it may introduce thermal stress during the cutting process, potentially affecting the superconducting properties of the tape. Mechanical cutting is a simple fabrication process, yet it may cause mechanical damage to the superconducting layer within the tape. Chemical etching presents challenges in controlling the width of the grooves during the etching process and environmental contamination. Subsequently, the article delves into the direct forming technologies for REBCO multi-core tapes, which include inkjet printing, mechanical scribing, and two-stage profile substrate techniques. Although inkjet printing technology can produce multi-core tapes with complex patterns, it is necessary to consider the issue of weak links at the grain boundaries of the REBCO superconducting material. Mechanical scribing, a simple and cost-effective process, requires precise control of the scribe thickness to minimize the diffusion of substrate components into the REBCO superconducting layer, which could lead to impurity doping or chemical reactions, thereby affecting superconducting performance. The two-stage profile substrate technique employs chemical solutions to etch micron-sized concave profiles, creating regular and uniform multi-filamentary structures.
Nevertheless, the fabrication technology of REBCO multi-filamentary tapes still faces many challenges, such as how to balance the cost and efficiency of the preparation process. Efforts are needed to further enhance the current-carrying capacity and mechanical properties of the tapes, as well as to ensure their stability when applied in extreme environments. Furthermore, the impact of micro-cracks and defects that may occur during cutting or etching processes on the superconducting performance needs to be addressed.

Key words： REBCO high-temperature superconducting multifilamentary tape critical current fabrication technology AC loss shielding current effect

收稿日期: 2023-11-08

PACS:

TM26

基金资助:

国家自然科学基金资助项目（52077212）

通讯作者: 周超男,1984年生,研究员,博士生导师,研究方向为超导科学与技术及工业化应用等。E-mail：chao.zhou@ipp.ac.cn

作者简介: 李佐光男,1993年生,博士研究生,研究方向为超导科学与技术。E-mail：zuoguang.li@ipp.ac.cn

引用本文:

李佐光, 张展, 魏绍清, 秦经刚, 周超. REBCO高温超导多芯带材的制备技术及性能研究进展[J]. 电工技术学报, 0, (): 231869-231869. Li Zuoguang, Zhang Zhan, Wei Shaoqing, Qin Jinggang, Zhou Chao. Research Progress on Fabrication Technology and Properties of REBCO High Temperature Superconducting Multifilamentary Tape. Transactions of China Electrotechnical Society, 0, (): 231869-231869.

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