Bi系和YBCO超导带材不同弯曲应变下的临界电流和n指数比较  

COMPARISON OF DIFFERENT BENDING STRAIN EFFECT ON CRITICAL CURRENT AND n VALUE OF Bi-2223 AND YBCO TAPES

作　　者：易培文 朱运鹏 孙敏[1] 羊新胜[1] 张勇[1] 赵勇[1,2] 

机构地区：[1]西南交通大学磁浮技术与磁浮列车教育部重点实验室超导与新能源研究开发中心,成都610031 [2]新南威尔士大学材料科学与工程学院

出　　处：《低温物理学报》2015年第4期271-275,共5页Low Temperature Physical Letters

基　　金：国家磁约束核聚变能研究专项基金(批准号:2011GB112001;2013GB110001;国际合作项目(批准号:2013DFA51050);国家自然科学基金(批准号:51271155;51377138;51002125);中央高校基本科研业务费资助项目(批准号:SWJTU12CX18;SWJTU11ZT31;2682014ZT-9;2682013CX004);四川省科技计划项目(批准号:2011JY0031;2011JY0130)资助课题~~

摘　　要：本文通过实验分别测试了不同弯曲直径下的Bi系和YBCO两种高温超导带材的临界电流,并通过公式拟合得到了不同弯曲直径下的n指数.根据所得实验数据分别绘制了两种带材的临界电流与弯曲直径、n指数与弯曲直径、临界电流衰减率与弯曲应变关系曲线,并将弯曲应变对两种带材临界电流和n指数的影响进行了比较分析.实验结果的分析发现两种带材的最小弯曲直径不同,可能与带材的结构有关,且极端弯曲条件下YBCO带材的临界电流衰减率远低于Bi系带材的临界电流衰减率.本实验结果对超导磁体的设计以及超导带材以线圈形式出现的一些其它电工应用有一定的参考意义.In this paper, the critical currents of Bi-2223 and YI3CO under different bending diameters are measured and n values under different bending diameters are achieved through the fitting formula. According to the experimental data, the dependence of critical current on bending diameter, n value on bending diameter, and critical current attenuation rate on bending diameter have been mapped respectively. Then the effects of different bending strain on critical current and n value about two tapes are analyzed. The experimental results show that the minimum diameters of two tapes are different, which may be related to the structures of the tapes. Under the extreme bending condition, the critical current attenuation rate of YBCO is far lower than that of Bi-2223. The experimental results play a significance role on the design of superconducting magnet and some other electrical applications with superconducting coils.

关 键 词：临界电流 弯曲应变 n指数 

分 类 号：TM26[一般工业技术—材料科学与工程]