Cu-Ni包套MgB_2带应力效应研究  

RESEARCH ON STRAIN EFFECT ON Cu-Ni SHEATHED MgB_2 SUPERCONDUCTING TAPE

作　　者：傅敏毅[1] 潘国卫[1] 焦正宽[1] 丁立人[2] 张勇[2] 陈治友[2] 韩汉民[2] 陈敬林[2] 

机构地区：[1]浙江大学物理系,杭州310027 [2]中国科学院等离子体物理所,合肥230031

出　　处：《低温物理学报》2004年第1期35-40,共6页Low Temperature Physical Letters

基　　金：国家重点基础研究专项经费 (批准号 :NKBRSF G19990 6 4 6 )资助课题~~

摘　　要：使用电测量方法测量了用粉末套管 (PIT)工艺制备的Cu Ni包套MgB2 单芯带的弹性模量E ,其值与Cu及其合金的弹性模量为同一量级 ,还证实了在带中存在着压缩预应力 .我们研究了该带在 4 .2K ,0 .5～ 4T磁场下弯曲成不同曲率时的Ic B特性曲线 ,并且计算相应曲率时的最大应变和应力 .弯曲实验显示该带材对应力较为敏感 ,必须改进工艺并实施机械强化 .The elastic modulus measurements of Cu-Ni sheathed MgB_2 monofilament tape fabricated by “power in tube” method have been performed using electric technique. The magnetic field dependence of I_c has been investigated on the sample subjected to various strain levels through bending of the tape with different radius. We found that our MgB_2 sample is sensitive to applied strains,mechanical reinforced MgB_2 tape is essential to practical application. The bend strain and stress have been calculated based on a formula derived from the definition.

关 键 词：二硼化镁 超导材料 应力效应 失超动力学过程 粉末套管工艺 PTT 铜-镍包套 临界温度 

分 类 号：O511[理学—低温物理]