简介:卷的商业等级和从日本和中国的electrodeposited铜陪衬被选择,并且他们的机械性质和微观结构被调查。在破裂力量有著名差别,这被观察,在裂缝和hydrophilicity在之间的延伸滚动并且electrodeposited铜陪衬。卷的铜陪衬让更高张力的力量,更低的韧性和更大的静电干扰比electrodeposited铜陪衬联系角度。卷的铜陪衬包含一块纤维质地,和electrodeposited铜陪衬有随机的水晶的取向。卷的陪衬包装了谷物,这也被观察,并且electrodeposited陪衬有equiaxial谷物。日本electrodeposited陪衬的一致好谷物尺寸和一些基础是为他们的更高的延伸的主要原因。
简介:Constrainedgroovepressing(CGP)isanewsevereplasticdeformationmethodsuitableforproducingultra-finegrainedsheetmetals.Inthiswork,theprocessingefficiencyforamuti-passCGPofpurecopperwasinvestigated.Witharelativelysmallgroovewidthof2mmandtightconstraint,asharpvariationofmechanicalpropertieswithpassnumberisobserved.Subgrainswiththesizeof*0.5lmhavedistinctboundaries,whichisthepredominantfeatureinthemicrostructureafterthreepasses.Theevolutionofdeformationhomogeneitycharacterizedbymicro-hardnessdistributionwasexaminedindetail.Observationsofopticalmicrographsandfracturesurfacemorphologyconfirmtheevolutionrule.Therelationbetweenelectricalresistivityandaccumulativeplasticstrainwasdiscussed.Crystallinedefects,micro-cracks,andmicrostructureuniformitytogetherdeterminethechangeofelectricalresistivityofCGPcopper.
简介:增强氧化钇的铜矩阵composites被干燥的球milling(DBM)准备,分别地,湿球milling(WBM)由火花血浆sintering(SPS)列在后面。它是为制作Cu-Y2O3composites。它被发现那Cu-Y2O3composites由DBM综合了展出更好的densification,机械、电的性质比那些由WBM。在由DBM的体积composites的加强的更少的凝块为更好的表演负责。为了推进,理解Y2在由DBM的体积的O3,准备粉末的形态学被调查并且分析。更高的球冲击能和矩阵表面上的铜氧化物的形成在DBM过程期间贡献小矩阵粒子,它为更少的凝块是有益的。
简介:Milledformofmesophasepitch-basedgraphitefiberswerecoatedwithatitaniumlayerusingchemicalvapordepositiontechniqueandTi-coatedgraphitefiber/Cucompositeswerefabricatedbyhot-pressingsintering.ThecompositeswerecharacterizedwithX-raydiffraction,scanning/transmissionelectronmicroscopies,andbymea-suringthermalproperties,includingthermalconductivityandcoefficientofthermalexpansion(CTE).Theresultsshowthatthemilledfibersarepreferentiallyorientedinaplaneperpendiculartothepressingdirection,leadingtoanisotropicthermalpropertiesofthecomposites.TheTicoatingreactedwithgraphitefiberandformedacontinuousanduniformTiClayer.Thiscarbidelayerestablishesagoodmetallurgicalinterfacialbondinginthecomposites,whichcanimprovethethermalpropertieseffectively.Whenthefibercontentrangesfrom35vol%to50vol%,thein-planethermalconductivitiesofthecompositesincreasefrom383to407Wá(máK)-1,andthein-planeCTEsdecreasefrom9.5910-6to6.3910-6K-1.
简介:Multiwalled碳nanotubes(CNT)由用羰基的铝层是涂的有铝hexacarbonyl的一位先锋的热分解过程。瞬间涂的CNT(Mo-CNTs)被增加进铜粉末借助于火花血浆sintering跟随的机械milling制作Mo-CNT/Cucomposites。当他们的内容是2.5vol.%7.5vol.%时,Mo-CNTs是在Cu矩阵的一致分散,当一些Mo-CNT簇清楚地在混合在10.0vol.%15.0vol.%Mo-CNTs的增加被观察时。Mo-CNT/Cucomposites的机械、电、热的性质被描绘,并且结果证明张力的力量和坚硬分别地比CNT免费的标本的那些高2.0和2.2倍。而且,Mo-CNT/Cucomposites展出了提高的热传导性但是劣等的电的电导率与sintered相比纯Cu。uncoatedCNT/Cucomposites被类似的过程制作,并且CNT/Cucomposites的测量张力的力量,坚硬,热传导性,和电的电导率是比Mo-CNT/Cucomposites的那些低的。
简介:闪锌矿(110)的电子性质出现忍受Fe,Mn和Cd杂质在闪锌矿的铜激活上用杂质的密度功能的理论,和效果被计算被调查。计算结果显示Fe和Mn杂质缩小闪锌矿表面的乐队差距并且导致变到传导乐队的费密水平。由Fe3d和Mn3d组成的杂质层次在乐队差距的轨道的出现对从原子价乐队的电子转移有益到传导乐队并且支持表面电导率和电气化学的活动。Fe和Mn杂质不能被Cu原子代替的结果表演,它为Cu原子,因此忍受Fe和忍受Mn闪锌矿减少交换地点(Zn)是难的被铜激活。Cd杂质在闪锌矿表面的电子结构上有小效果;然而,Cd原子被Cu原子容易代替,并且这是忍受Cd闪锌矿能容易被漂浮的原因。
简介:EffectofaddedCo2+(aq)oncopperelectrowinningwasstudiedusingdopedpolyaniline(Pani)andPb-Ag(1%)anodesandastainlesssteelcathode.ThepresenceofaddedCo2+(aq)intheelectrolytesolutionwasfoundtodecreasetheanodepotentials.TheoptimumlevelofCo2+(aq)concentrationintheelectrolyte,withrespecttothemaximumsavingofpowerconsumptionwasestablished.Linearsweepvoltammetry(LSV)wasusedtostudytheinfluenceofaddedCo2+(aq)ontheanodicprocessesinacoppersulfate-sulfuricacidelectrolyte.Theoxygen-evolutionpotentialforPanianodeisdepolarisedatlowercurrentdensities(≤0.01A/cm2)andattainssaturationatρ(Co2+)o≈0.789g/L;whilsttheoxygen-evolutionpotentialforPb-Ag(1%)anodeisdepolarisedathighercurrentdensities(≤0.02A/cm2)andattainssaturationatρ(Co2+)o≈1.315g/L.Thepreferredorientationsofthecopperdepositschangefrom(220)to(111)withtheadditionof0.394?0.789g/LCo2+buthigherconcentrationsfavor(220)orientationagain.