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张涵,马光同,李兴田,彭金方,徐志彪,龚天勇,朱旻昊.具有极低电阻的涂层超导带材连接工艺研究[J].稀有金属材料与工程(英文),2018,47(3):748~753.[Zhang Han,Ma Guangtong,Li Xingtian,Peng Jinfang,Xu Zhibiao,Gong Tianyong,Zhu Minhao.A Simple and Effective Process to Join Coated Superconductors at a Low Resistance[J].Rare Metal Materials and Engineering,2018,47(3):748~753.]
A Simple and Effective Process to Join Coated Superconductors at a Low Resistance
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Received:March 01, 2016  Revised:April 25, 2016
DOI:
Key words: superconducting tapes  electrical joint  critical current  resistance
Foundation item:国家自然科学基金项目(面上项目,重点项目,重大项目),四川省青年科技基金,中央高校基本科研业务费资助项目,牵引动力国家重点实验室自主研究课题
Author NameAffiliationE-mail
Zhang Han Southwest Jiaotong University zhanghan028@163.com 
Ma Guangtong 西南交通大学牵引动力国家重点实验室 gtma@home.swjtu.edu.cn 
Li Xingtian 西南交通大学牵引动力国家重点实验室  
Peng Jinfang 西南交通大学牵引动力国家重点实验室  
Xu Zhibiao 西南交通大学材料先进技术教育部重点实验室  
Gong Tianyong 西南交通大学牵引动力国家重点实验室  
Zhu Minhao 西南交通大学材料先进技术教育部重点实验室  
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Abstract:
      As recent advances on the performance of the YBCO coated conductor (CC) tape, its attractive perspectives for application have opened up for us. Joining process of CC tapes is inevitable for development of coated superconductor based apparatuses where single tape is not long enough or needed to be looped. Generally the joint was completed at a certain temperature and under a constant pressure that were investigated in prior literatures. Because the CC tape is very thin, easy to damage caused by deformation in some region of the tape, the surface of the joint making table should be flat and smooth enough, which have not been yet paid serious attention. Meanwhile, the smoothness of the pressing table is crucial to obtain the joint with low resistance. In this paper, a simple and effective joint of coated superconductor tapes making process depended on a soldering table with high smoothness less than 5 μm/100 mm was investigated. In the process, the non-superconducting lapped joint method with face-to-face configuration was employed, and the solder layer thickness and the joint lapped length varied. The current-voltage characteristic of the jointed tapes was measured in liquid nitrogen bath by a standard four-probe technique. The joint with sufficiently low resistance of 6.3 nΩ was easily achieved with a lapped length of 14 cm, which is ascribed to the use of a soldering table with high smoothness. In addition, the joints microstructure was observed by the metallographic microscope and scanning electron microscopy (SEM) to reveal the distribution of the solder between the joined CC tapes.