铁基对垂直作用于MgB_2/Fe超导带材外场的影响  

Influence of Fe Sheath on MgB_2/Fe Tapes in a Perpendicular Magnetic Field

作　　者：张绪红[1] 李晓航[1] 张正臣[1] 杜晓纪[1] 

机构地区：[1]中国科学院电工研究所应用超导重点实验室,北京100080

出　　处：《应用基础与工程科学学报》2006年第2期247-253,共7页Journal of Basic Science and Engineering

基　　金：国家自然科学基金(No.50377040)资助

摘　　要：铁基二硼化镁(MgB2/Fe)超导线带材有望在20K—30K、低场下得到广泛应用.本文考虑到铁的磁导率与磁场关系的非线性,结合J-A磁滞回线方程,构建了MgB2/Fe超导带材内超导芯的磁场与外加磁场的关系的模型.通过数字计算,研究了铁基截面尺寸及不同铁基底对外场的影响,计算了影响大小与外加磁场大小的关系.这对于解释MgB2/Fe超导带材的临界电流与外场的关系、进一步分析其应用中的低频交流损耗都将具有一定意义.MgB2/Fe superconducting material looks promising for large-scale engineering applications at temperature （20K-30K） region and low magnetic field. In this paper, considering that magnetization curve of iron is non-linear, we incorporate the Jiles-Atherton ferromagnetic hysteresis model to construct the mathematical formulations of relation between the applied perpendicular magnetic field on MgB2/Fe tapes surface and the magnetic field of MgB2 core. The dependences of the magnetic relations on various cross section dimensions and various type iron-clad materials were digitally calculated based on the derived formulations. It was shown that an iron-clad shielding effect occurs within a certain range of external magnetic field. Our results will be helpful for understanding the effect of magnetic field on critical current of MgB2/Fe tapes and further analyzing the alternating current losses in MgB2/Fe tapes.

关 键 词：MgB2/Fe超导材料 磁滞回线 磁场 

分 类 号：TM263[一般工业技术—材料科学与工程]