B_(10)C掺杂MgB_2/NbZr/Cu线材的超导性能研究  

Superconductivity of MgB_2/NbZr/Cu Wires with B_(10)C Doping

作　　者：王庆阳[1] 闫果[1] 刘国庆[1] 李成山[1] 卢亚锋[1] 张平祥[1,2] 

机构地区：[1]西北有色金属研究院,陕西西安710016 [2]西部超导材料科技有限公司,陕西西安710016

出　　处：《稀有金属材料与工程》2008年第A04期83-86,共4页Rare Metal Materials and Engineering

基　　金：国家"863"计划(2006AA03Z201;2007AA03Z237);"973"计划(2006CB601004);国家自然科学基金(50672077)资助

摘　　要：通过原位法粉末装管工艺制备了B10C掺杂的MgB2/NbZr/Cu超导线材。采用X射线衍射仪、扫描电子显微镜(SEM)、PPMS测试仪等测试手段检测了样品的成相情况、微观结构以及超导电性。结果显示该掺杂对MgB2/NbZr/Cu超导线材的磁通钉扎性能及临界电流密度有一定的影响:750℃/2h的热处理制度能够使C元素成为有效磁通钉扎中心,线材的磁通钉扎性能和超导电性均有所提高。20K时,MgB2/NbZr/Cu超导线材的不可逆磁场Hirr达到5.2T;在20K、2T外磁场条件下,其临界电流密度达到2×104A/cm2。The B10C doped MgB2/NbZr/Cu wires were prepared by in-situ powder-in-tube （PIT） method in this paper. The phase formation, microstructure and superconductivity of MgB2/NbZr/Cu wires were measured with X-ray diffraction, scan electron microscope and PPMS instrument respectively. The results show that the amorphous carbon doping can improve the flux pinning force and the critical current of MgB2/NbZr/Cu wires. The carbon was dispersed in MgB2 lattice after heat-treatment at 750 ℃ /2 h and became the flux pinning center which could improve the superconductivity of MgB2. The irreversibility field of MgB2/NbZr/Cu wires can reach 5.2 T at 20 K and the critical current 2×10^4A/cm^2 at 20 K, 2 T.

关 键 词：MgB2/NbZr/Cu线材 原位粉末装管法 B10C掺杂 超导电性 

分 类 号：TM26[一般工业技术—材料科学与工程]