Ba122铁基超导带材焊接接头制备与性能研究  

Fabrication and performance studies of the soldering joint for Ba122 iron-based superconducting tape

作　　者：徐志鹏 赵航 俞雷 丁杭伟 黄鹏程[2] 陈文革[2] Xu Zhipeng;Zhao Hang;Yu Lei;Ding Hangwei;Huang Pengcheng;Chen Wenge(University of Science and Technology of China,Hefei 230026,China;High Magnetic Field Laboratory,Hefei Institutes of Physical Science,Chinese Academy of Science,Hefei 230031,China)

机构地区：[1]中国科学技术大学,合肥230026 [2]中国科学院合肥物质科学研究院强磁场科学中心,合肥230031

出　　处：《低温与超导》2024年第7期20-25,共6页Cryogenics and Superconductivity

基　　金：国家自然科学基金(U1832213)资助。

摘　　要：本文主要介绍了Ba122铁基超导带材焊接接头的制作工艺,使用不同的焊料制作铁基超导焊接搭接和桥接接头并对其性能进行了研究。通过接头样品的性能测试,获得了4.2 K下的接头电阻值,同时也评估了接头的机械强度。研究结果表明:对于搭接接头,使用高熔点焊料可显著降低接头电阻至最低45 nΩ。而对于桥接接头,推荐使用低熔点焊料,其最低电阻为108 nΩ。接头电阻随接头长度增加而减小,但过长的接头会导致理论与实际电阻值偏差增大。此外,不同焊料对接头机械强度影响不大,强度主要依赖于超导带材本身。热处理后的铁基带材和接头机械强度不高,在制作铁基超导线圈时需进行特殊保护。This paper focused on the fabrication process of Ba122 iron-based superconducting strips with soldering joints,using different solders to fabricate iron-based superconducting soldering overlap and bridged joints and investigating their performance.The performance tests of the joint samples were carried out to obtain the resistance value of the joints at 4.2 K.The mechanical strength of the joints was also evaluated.The results show that,for lap joints,the use of high melting point solder significantly reduces the joint resistance to a minimum of 45 nΩ,while for bridge joints,considering the properties of the intermediate superconductor YBCO,the use of low melting point solder is recommended,with a minimum resistance of 108 nΩ.The joint resistance decreases with the increase of the length of the joints,but excessively long joints lead to an increase in the deviation of the theoretical from the actual resistance values.In addition,different solders have little effect on the mechanical strength of the joints,and the strength is mainly dependent on the superconducting strip itself.The mechanical strength of heat-treated iron-based strips and joints is not high,so special protection is required when fabricating iron-based superconducting coils.

关 键 词：铁基超导 焊接接头 电阻 机械强度 

分 类 号：TM265[一般工业技术—材料科学与工程]