简介:TheprocesstoobtainhighT(110K)phasequickly,themicrostructureandpropertiesofAg-sheathedBi(Pb)-Sr-Ca-Cu-Osuperconductortapeshavebeenstudied.ItwasfoundthattheformationtimeofthehighTcphasewasgreatlyshortenedbytheadditionofmoreCaandCutothenominalcompositionofBi(Pb):Sr:Ca:Cu=2:2:2:3andtheadoptionofappropriatesinteringtemperatureandcoolingrate.SuperconductorpowderwithpredominanthighT,phasewaspreparedaftera840C/50htreatment.TheJoftheAg-sheathedtapesandthemagneticfielddependenceofJwereobviouslyimprovedbyrepeatedlypres-singandsintering.Themaximumtransportcurrentdensityat77Kinazeromagneticfieldwas12,200A/cm2.ThemagneticdependenceofJwassummarizedasfollows:6.450A/cm2(B⊥1.B∥S.0.1T)1,810A/cm2(B⊥1.B∥S,1T),390A/cm2(B⊥1.B∥S,2T)(B:magneticfield.1:electriccurrent.S:surfaceoftapes).TheimprovementofJwasattributedtotheformationoftheplate-likestructurewithhomogeneouscompositiondistributionandthestrongc-axistexture.
简介:摘要:SR20飞机飞行环境系统主要是通过传感器和皮托管等部件感受飞机外部环境,将外部环境数据通过各个相应的系统来辅助飞机的导航系统。本文主要对西锐SR20飞机的飞行环境系统的组成和基本原理进行介绍,并且对故障现象做初步分析。
简介:SolderPlus系列锡膏产品是电子和电子机械行业生产用锡膏的最理想选择,该系列无铅锡膏质量更稳定,成本更低,是焊锡丝的最佳替代品。使用SolderPlus锡膏,一个操作工、一台点胶机就可以完成生产线上快速、稳定的点焊,而且适用于任何焊接工艺,更易控制、更高效。所有的无铅锡膏产品都拥有多种助焊剂配方。免清洗锡膏,省去了昂贵的清洗流程。在残留助焊剂可以被清除时可采用RA助焊剂配方和水溶性锡膏。并在近期新推出了具抗塌陷性,