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,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.]
具有极低电阻的涂层超导带材连接工艺研究
投稿时间:2016-03-01  修订日期:2016-04-25
中文关键词:  超导带材  接头  临界电流  电阻
基金项目: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
中文摘要:
      随着近年来YBCO涂层超导带材性能的提升,其相关应用已逐渐成为研究热点。由于单根带材长度通常不能满足实际应用需要或需要形成闭合线圈,涂层超导带材的连接是各项应用中必不可少的一个关键步骤。国内外对带材接头工艺中控制因素的研究主要集中在焊接温度、焊料、施加压力等方面。由于涂层带材很薄,极易因为局部的微小形变而损坏退化,因此焊接平台表面应该足够平整光滑,焊接平台具有高平整度表面也是获得极低电阻接头的关键因素之一,而目前这一点还未引起足够重视。本文研究了一种简便有效的基于高平整度(小于5 μm/100 mm)焊接平台的涂层超导带材焊接工艺。采用该工艺及带材正面相对的搭接方式,进行了不同厚度和搭接长度的带材接头焊接。之后,采用四引线法在液氮环境中对接头进行了电性能测试,当搭接长度为14 cm时接头电阻低至6.3 nΩ。此外,通过金相光学显微镜和扫描电子显微镜对接头微观结构进行了扫描,获得了接头处焊料分布状态。
A Simple and Effective Process to Join Coated Superconductors at a Low Resistance
英文关键词:superconducting tapes  electrical joint  critical current  resistance
英文摘要:
      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.
作者单位E-mail
张涵 西南交通大学牵引动力国家重点实验室,西南交通大学电气工程学院 zhanghan028@163.com 
马光同 西南交通大学牵引动力国家重点实验室 gtma@home.swjtu.edu.cn 
李兴田 西南交通大学牵引动力国家重点实验室  
彭金方 西南交通大学牵引动力国家重点实验室  
徐志彪 西南交通大学材料先进技术教育部重点实验室  
龚天勇 西南交通大学牵引动力国家重点实验室  
朱旻昊 西南交通大学材料先进技术教育部重点实验室  
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