资源描述：
《19芯fe／cu复合包套二硼化镁超导线制备及其超导性能研究》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。
1、19芯Fe／Cu复合包套二硼化镁超导线制备及其超导性能研究低温与超导第35卷第3期本期头条FocusCryo.&Supercond.Vo1.35No.319芯Fe/Cu复合包套二硼化镁超导线制备及其超导性能研究禹争光,马衍伟,王栋棵,张现平,高召顺,闫果,卢亚锋(1.中国科学院电工研究所应用超导实验室,北京100080;2.西北有色金属研究院,西安710016)摘要:采用In～SituPIT方法,以工业级低纯度B粉(92%)和镁粉(99%)为原料制备了19芯Fe/Cu复合包套MSB超导线.断面扫描电镜观测表
2、明,超导线内部超导芯分布排列均匀,Fe层都能完好包围MgB芯体,Fe与cu层结合紧密,填充因子0.17.750~C热处理1h后,样品超导转变温度(onset)=33.5K,转变宽度△=4.8K.X光衍射检测发现,MgB超导相中不存在其它Mg—B化合物杂项,但含有少量Mgo和FeB.多芯化后,超导芯中FeB略有增加.四引线,c测试发现,19芯样品在4.2K,4T时,临界电流密度为5622A/era,比单芯样品14400A/cm降低约2/3.关键词:原位粉末填管法;19芯MgB线材;铁铜复合包套;工业级原料Fabric
3、ationof19..filamentFe/CucompositesheathedMgB2wireanditssuperconductivityYuZhengguang,MaYanwei,WangDongliang,ZhangXianping,GaoZhaoshun,YanGuo,LuYafeng(1.ApedSuperconductivityLaboratory,InstituteofElectricalEngineering,ChineseAcademyofSciences,Beijing100080,Chin
4、a;2.NorthwestInstituteforNonferrousMetalResearch,Xi'an710016,China)Abstract:UsinglowpurityofamorphouseBpowder(92%)andMgpowder(99%)asstartingmaterials,19一filamentFe/Cucom-positesheathedMgB2wirewithouterdiameter1.9mmWaSfabricatedbytheinsitupowder—in—tubemethod.T
5、hesampleWaScharacterizedusingscanningelectronmicroscope,X—raydiffractionandsuperconductingquantuminterferencedevicemagnetometer,transitionJanditsmagneticdependencewereevaluatedbyastandardfour—probetechnique.ItisfoundthateachfilamentsurroundedbyFechemicalbarrie
6、risevenlydistributed,noanyobviousflawCanbedetectedintheinterfacebetweenFeandCu,thefillingfactorofthewirereaches0.17.Thecriticaltemperatureandtransitionwidthare35.5Kand4.8K,respectively.ThesampleafterheattreatmentOf750~Cforlhexhibitshishpu—rityofMgB2withasmalla
7、mountofM:soandFeB2,andthecontentofFB2in19一filamentsampleincreaSescomparedtoinmono—filamentone.At4.2K,4T,thetransportcurrentdensityvalue,Jf0r19一filamentsamplereaches5622A/cm,about2/3lowerthanthatofmonofdamentsample(14400A/cm2).rnledegradationofJ.f0r19一filaments
8、ampleisattributedtotheintroductionofmoreFeB2.Keywords:Insitupowder—in—tube,19一fdamentMgB2superconductor,Fe/Cucompositesheathed,Commercialmaterials1引言二硼化镁(MgB2)是2001年日本科学家Akimitsu发现
