不同纯度硼粉搭配对MgB_2多芯线材性能的影响  

EFFECTS OF PROPORTIONAL B MIXTURE ON MICROSTRUCTURE AND SUPERCONDUCTING PROPERTIES OF MgB_2 WIRES

作　　者：刘国庆[1] 冯建情[1] 孙昱艳[2] 庞玉春[3] 贾佳林[1] 王庆阳[1] 杨芳[1] 闫果 李成山[1] 

机构地区：[1]西北有色金属研究院,西安710016 [2]东北大学材料与冶金学院,沈阳110004 [3]宝胜科技创新股份有限公司,江苏宝应225800 [4]西部超导材料科技有限公司,西安710018

出　　处：《低温物理学报》2013年第1期22-25,共4页Low Temperature Physical Letters

基　　金：国家"973"计划(2011CBA00104);陕西省"13115"重大专项(2010ZDKG-32);江苏省产学研联合创新资金(BY2010149)资助的课题~~

摘　　要：采用in-situ PIT工艺,以不同纯度硼粉相互搭配做为前驱粉末中的硼源,选用中心铜铌复合棒增强的导体结构制备了MgB2六芯线材,研究了不同纯度硼粉搭配对线材粉末相组成、微观结构以及超导电性的影响,其结果表明当高纯硼粉含量不低于50%时,自场下的临界电流不存在明显的衰减,因此以适当低纯硼粉(95～97%)和高纯硼粉(99.999%)相互搭配不但不会降低线材的临界电流,而且可以很大程度上降低线材的制造成本,为线材的实用化提供了很好的经济基础.Effects of B powder mixture by four proportions of two different purities on the phase compositions, microstructure and the superconducting properties of the ＆filament MgB2 wires enhanced by Cu-Nb core were inves- tigated. It has been found that no obvious decline of critical current was observed in the wire samples with high puri- ty B powder no less than 50% content. Therefore, the B powder mixture in the precursor by a suitable proportion of high and low purity B contributes to the manufacturing cost saving without the reduction in the transport current carrying abilities of the MgB2 wires. The wire samples were all prepared by standard in-situ PIT （Powder in Tube） method.

关 键 词：微观结构 超导电性 MgB2多芯线材 

分 类 号：TM26[一般工业技术—材料科学与工程]