热处理对C掺杂MgB_2/Nb/Cu单芯线材微观结构及超导电性的影响  

EFFECT OF HEAT TREATMENT ON MICROSTRUCTURE AND SUPER CONDUCTIVITY OF MgB_2/Nb/Cu SINGLE FILAMENT WIRES

作　　者：刘国庆[1] 王庆阳[1] 孙昱艳[2] 熊晓梅[1] 焦高峰[1] 闫果 

机构地区：[1]西北有色金属研究院 [2]东北大学 [3]西部超导材料科技有限公司

出　　处：《低温物理学报》2011年第2期116-119,共4页Low Temperature Physical Letters

基　　金：国家高技术研究发展计划(863)项目(批准号:2007AA03Z237);国家自然科学基金项目(批准号:50877067);国家重大基础研究计划(973)项目(批准号:2006CB601004)资助的课题~~

摘　　要：采用原位法粉末装管工艺(In-situ)制备了MgB2/Nb/Cu单芯线材,通过X射线衍射(XRD)、能谱分析(EDS)和物性测试仪(PPMS)等手段研究了热处理温度对线材微观结构及超导电性的影响.结果显示,随着热处理温度的提高,衍射图谱中的(110)峰向高角度偏移,说明掺杂元素C进入晶格的量也在增加;烧结温度对C掺杂MgB2超导线材的磁通钉扎性能及临界电流密度也有一定的影响,750℃的热处理制度能够使C元素均匀的弥散于MgB2晶格中,成为有效磁通钉扎中心,提高了MgB2线材的临界电流密度.The MgB2/Nb/Cu wires were fabricated by in-situ PIT method.The microstructure and superconductivity of MgB2 wires heat treated at different temperatures were analyzed by X-ray diffraction （XRD）,Scanning Electronic Microscopy （SEM） and Physical Property Measurement System （PPMS）.The results show that （110） peak shifted to higher angle with the heat-treatment temperature increasing,indicating the amount of doping element C breaking into MgB2 crystal lattice increasing;the flux pinning performance and critical current density of MgB2 wires were also influenced by sintering temperature to some extent.Under the 750℃ heat treating regime,doping element C distributed uniformly and became effective flux pinning centers,thus improving Jc performance of MgB2 wires.

关 键 词：微观结构 超导电性 

分 类 号：TM26[一般工业技术—材料科学与工程]