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  • 储梦梅,赵苏串,陈静,刘志勇,周洪斌,白传易,周迪帆,李敏娟,蔡传兵.YBCO 带材无阻连接热退火效应研究[J].低温物理学报,2020,(1):25-31.    [点击复制]
  • CHU Mengmei,ZHAO Suchuan,CHEN Jing,LIU Zhiyong,ZHOU Hongbin,BAI Chuanyi,ZHOU Difan,LI Minjuan,CAI Chuanbing.Study on Heat Treatment Effect of YBCO Tape in Superconducting Welding[J].LOW TEMPERATURE PHYSICAL LETTERS,2020,(1):25-31.   [点击复制]
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YBCO 带材无阻连接热退火效应研究
储梦梅1, 赵苏串1, 陈静1, 刘志勇1,2, 周洪斌1, 白传易1, 周迪帆1, 李敏娟1, 蔡传兵1
0
(1.上海大学理学院物理系, 上海市高温超导重点实验室, 上海 200444;2.上海上创超导科技有限公司, 上海 201401)
摘要:
超导焊接是第二代高温超导(2G-HTS) 带材研究的重要内容, 在两根超导带材中间生长超导连接层可实现无阻连接. 在超导连接层的生长过程中, 原来的两根超导带材需再次经历热处理, 目前这方面的研究甚少. 本文系统研究了780 ℃ 热退火中, 时间、 气氛对带材性能的影响. 分析了样品的显微结构、 表面形貌以及临界电流密度(J c ) , 结果表明:2 h 干氮氧气氛有利于提高原始带材的性能; 湿氮氧气氛使J c 值降低. 这可能是湿气的存在增加了晶粒缺陷, 使杂质的扩散通道增加, 从而Ba-Cu-O 积聚生长, 造成 YBCO 性能恶化. 在文中我们还利用 XRD 进行了应力拟合分析了应力变化.
关键词:  YBCO 带材, 无阻连接, 热退火
DOI:10.13380/j .ltpl.2020.01 .003
基金项目:
Study on Heat Treatment Effect of YBCO Tape in Superconducting Welding
CHU Mengmei1, ZHAO Suchuan1, CHEN Jing1, LIU Zhiyong1,2, ZHOU Hongbin1, BAI Chuanyi1, ZHOU Difan1, LI Minjuan1, CAI Chuanbing1
(1.Shanghai Key Laboratory of High Temperature Superconductors ,Physics Department , Shanghai University , Shanghai 200444, China;2.Shanghai Creative Superconductor Technologies Co . Ltd . , Shanghai 201401 , China)
Abstract:
Realization of non-resistive, superconducting welding is of great significance for the application of second generation high-temperature superconducting (2G-HTS ) tapes. Superconducting welding requires generally a superconducting joint made between two well processed HTS tapes. And these two HTS strips need to undergo the heat treatment again to induce the texture growth of the joint layer. There is yet little work focusing on the effects of repeated heat treatment on the HTS tapes. In this paper, we systematically studied the effects of re-heat time and atmosphere at 780 ℃ on the properties of HTS strips. The microstructure, surface morphology, and critical current density (Jc ) of the sample were characterized. The results showed that re-heating in mixed dry nitrogen and oxygen atmosphere for2 hours improved the performance of the original strip, however,wet nitrogen and oxygen atmosphere decreased the Jc value. This is considered due to the presence of moisture that increases grain defects and diffusion channels for impurities, and thus accumulates Ba-Cu-O, which deteriorates YBCO performance. The stress changes during the process were as well analyzed using stress fitting based on XRD results.
Key words:  YBCO tapes, superconducting welding, heat treatment

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