预览加载中，请您耐心等待几秒...

制作Nb_3Sn多芯复合超导线材的新方法.docx

预览
1/2
2/2

在线预览结束，喜欢就下载吧，查找使用更方便

下载提示 文本预览

如果您无法下载资料，请参考说明：

1、部分资料下载需要金币，请确保您的账户上有足够的金币

2、已购买过的文档，再次下载不重复扣费

3、资料包下载后请先用软件解压，在使用对应软件打开

制作Nb_3Sn多芯复合超导线材的新方法 I.Introduction Superconductivityisauniquephenomenonwherecertainmaterialsexhibitzeroelectricalresistanceatverylowtemperatures.Thispropertyhasapplicationsinvariousfields,includingmedicalimaging,powertransmission,andhigh-energyparticleaccelerators.Nb3Snisoneofthemostpromisingmaterialsforhigh-fieldsuperconductingmagnetsasitexhibitshighcriticalmagneticfieldsandhighcurrentdensity.However,producinghigh-qualityNb3Snwiresforhighmagneticfieldapplicationsremainsachallenge.Inthispaper,wepresentanewmethodforproducingNb3Snmulti-strandcompositesuperconductingwires. II.LiteratureReview TheproductionofNb3Snwireinvolvesacomplexprocessthatrequiresprecisecontrolofvariousparameterssuchasthechemistryofthestartingmaterials,heattreatment,deformation,andinsulation.Varioustechniqueshavebeendevelopedtoproducehigh-qualityNb3Snwire,includingpowder-in-tube(PIT),internaloxidation(IO),andbronzeprocess(BP).However,eachofthesetechniqueshasitslimitationsintermsoftheachievablecriticalcurrentdensitiesandmagneticfieldperformance. PITisawell-establishedtechniqueforproducingNb3Snwire,butitspracticalityforproducinghigh-fieldconductorsislimitedduetothedifficultyofachievinghighpackingfractionsandmaintainingthestructuralintegrityofthecore.IOisalsoapromisingtechnique,butitisstillunderdevelopment,andfurtherresearchisneededtoimproveitscriticalcurrentdensity.BPisamaturetechniquethatproduceshigh-qualityNb3Snwires,butitislimitedbylowpackingfractionsandlowcurrentdensityinhighmagneticfields. III.Methodology Ourproposedmethodinvolvesthefollowingsteps: Step1:ProductionofNb3Snfilaments First,Nbfilamentswithadiameterof50μmwerefabricatedbytheconventionalcolddrawingtechnique.TheseNbfilamentswerethencleanedwithadilutesolutionofhydrochloricacid(HCl)andnitricacid(HNO3)toremoveanyimpurities. Next,athinlayeroftin(Sn)withathicknessof500nmwasdepositedontotheNbfilamentsusingaphysicalvapordeposition(PVD)technique.TheSn-coatedNbfilamentswerethenannealedinavacuumfurnaceat800°Cfor30minutestoformaNb3Snlayeronthesur