Nb扩散层对MgB2/Nb/Cu线材超导电性的影响(英文)  

Influence of Nb Diffusion Layer on Superconductivity of MgB_2/Nb/Cu Wires

作　　者：王庆阳[1,2,3,4] 张平祥[1,2] 闫果[2] A.Sulpice 熊晓梅[2] 杨芳[2] 刘国庆[2] 焦高峰[2] 李成山[2] 

机构地区：[1]西北工业大学 [2]西北有色金属研究院 [3]Institut NEEL/CNRS-UJF,B.P.166,38042 Grenoble Cedex 9,France [4]CRETA,CNRS,BP.166,38042 Grenoble Cedex 9,France

出　　处：《稀有金属材料与工程》2013年第5期881-884,共4页Rare Metal Materials and Engineering

基　　金：Nature Science Foundation of China(50877067);National Basic Research Program of China(2011CB605904)

摘　　要：采用原位法粉末装管工艺(in-situ PIT),以Nb/Cu复合管作为包套材料制备了MgB2超导线材并且在氩气保护气氛中,不同温度条件下保温2h进行成相热处理。分别采用电阻-温度测试、磁矩转变测试、临界传输电流测试以及Nb-MgB2界面磁光研究等分析手段进行研究。结果表明:当热处理温度高于750℃时,在MgB2超导芯丝和Nb阻隔层之间形成一个扩散层,该扩散层的存在阻碍了电流的传输,从而导致在磁测法测试中可以检测到超导相存在,而在传输法测试中无法看到超导传输现象。说明采用Nb作为MgB2超导线带材的扩散阻隔层时其热处理温度不能高于750℃。The MgB2 wires were prepared by in-situ Powder-in-Tube （PIT） method with Nb/Cu compounds tube as the sheath and then were heat treated at various temperatures for 2 h in flowing argon. The resistivity （R-T）, magnetic moment （M-T）, transport critical current （Ic-B） and magneto optical （MO） properties of MgB2 wires were analyzed. The results show that there is a diffusion layer between MgB2 superconducting core and Nb barrier layer when the heat-treatment temperature is higher than 750°C, and this diffusion layer obstructs the current transfer into MgB2 superconductor core from the Cu sheath. This indicates that the best heat-treatment temperature for the MgB2 wires with Nb as the barrier layer should be lower than 750°C.

关 键 词：MGB2 NB Cu超导线材 超导电性 无定形碳掺杂 

分 类 号：TM26[一般工业技术—材料科学与工程]