简介:Mg–9Li–3Al–1.6Yalloyswerepreparedthroughmixturemethod.Themicrostructure,mechanicalproperties,andcorrosionresistanceoftheas-castandasextrudedalloyswerestudiedbyopticalmicroscopy(OM),scanningelectronicmicroscopy(SEM),X-raydiffraction(XRD),mechanicalpropertiestesting,andelectrochemicalmeasurement.Theas-castMg–9Li–3Al–1.6Yalloywiththeaveragegrainsizeof325lmiscomposedofb-Limatrix,blocka-Mg,andgranuleAl2Yphases.Afterextrusion,thegrainsizeoftheas-castalloyisobviouslyrefinedandreachesto75lm;thestrengthandelongationoftheextrudedalloyareenhancedby17.20%and49.45%,respectively,owingtotheirfinemicrostructureandreductionofcastingdefects.Theas-extrudedalloyshowsbettercorrosionresistancecomparedtotheas-castone,whichmayberelatedtothelowstoredenergyanddislocationdensityintheextrudedalloy,alsothehomogenizationtreatmentbeforeextrusion.
简介:1IntroductionTherareearthcobaltalloyshavethepotentialformakingthemagneticandmagnetoopticalmaterials.Sofar,therareearthcobaltalloyfilmsaresubstantiallyproducedbysputteringorvacuumplating.Ifsuchfilmsarepreparedbyelectrodepositioninstead,productionefficiencywouldbeimprovedandthecompositionofthealloycouldbecontrolled.Becausetheoxidationreductionpotentialsofrareearthelementsareverynegative,organicsolventsmaybeusedaselectrolyticmedia.ElectrodepositionofGdCoandSmCoinorganicsolutionshasbeenreporte...
简介:LayeredcathodematerialLiCo1/3Ni1/3Mn1/3O2wassynthesizedbyPechiniprocess,andinvestigatedusingX-raydiffraction(XRD),scanningelectronmicroscopy(SEM)andgalvanostaticcharge/dischargecycling.Thesampleiswell-crystallizedandhasaphase-purea-NaFeO2structure.Theparticlesizesareuniform,anddistributedintherangeof20-200nm.TheinitialdischargecapacityoftheLi/LiCo1/3Ni1/3Mn1/3O2cellwasabout149mAh·g-1whenitwascycledatavoltagerangeof4.5-2.3Vwithaspecificcurrentof0.25mA.Theresultisbetterincomparisonwithsolid-statesolutionmethod.Thesyntheticprocedurewasdiscussed.Threemajorreactions:chelation,esterification,andpolymerizationsuccessivelyoccurred.
简介:LaCrO_3的nano粉末被一条大音阶的第五音胶化线路准备。从350~550K的LaCrO_3nano粉末的热能力被DSC方法测量并且是表示了:C_(p(LaCrO3))(±0.112)=166.844-8.500x10~(-3)T-1.022x10~6T~(-2)(J/(摩尔·K))(350-550K)。一个EMF测量集会为流电的房间作为电解质与CaF_2被开发。可逆房间的FrommeasuredEMF数据,(-)磅,La_2O_3,LaF_3,|CaF_2|O_2(1atm),LaF_3,LaCrO_3,Cr_2O_3,磅(+),和吉布斯的相关价值释放的O_2(1atm)精力,吉布斯LaCrO_3的形成的免费精力从700~885K被计算:ΔG_(f,LaCrO3)~Θ=-1555.364+0.354T(kJ/mol)(700-885K)。并且免费精力从简单氧化物La_2O_3andCr_2O_3反应改变的吉布斯是打算的是:ΔG_(f,公牛(LaCrO3))~Θ=-94.758+8.530x10~(-2)T(kJ/mol)(700-885K)。
简介:ThemicrostructureandtensilepropertiesofSn-9Znsolderunderdifferentcoolingandagingconditionwerestudied.Duringsolidification,thedistributionofZn-richphasesandgrainsizeinthemicrostructureofSn-9Znsolderweredecidedbythecoolingrate.TheZn-richphaseinSn-9Znsolderunderfurnacecooling,aircoolingandwatercoolingmediawasseparatelyexistedascoarsendendriticandneedlelikeshape,fineneedlelikeshapeandveryfinerod-likeshape,respectively.Afteraging,thecoarsendendriticwasbrokenandthecoarsenneedlelikeZn-richphasewaspartlychangedintofinedistributionofZn-richphaseforSn-9Znsolderwithfurnacecooling,andtherod-likeZnphaseintheSn-9ZnsolderunderwatercoolingwaschangedtoconglomeratedZnwithneedleshape.DuringtensiletestingonSn-9Znsolder,tensilestrengthandductilityreachedthebestwithwatercooling,butdecreasedwithagingeffect.Meanwhile,theductilityofsolderwithaircoolingandthestrengthofsolderwithfurnacecoolingincreasedwithaging.Thefracturemodewasductileandwasindependentofcoolingmediaandagingeffect.Thesizeanddepthofdimplesdecreasedfromwater,furnacetoaircooling.Afteraging,numberandsizeofdimplesincreasedonthesolderwithfurnacecoolingandaircooling.ThechangeonthesizeofdimplesfortheSn-9Znsolderunderdifferentcoolingconditionandwithagingeffectwasaccordancetothetensileproperties.
简介:EmployingLi2CO3,NiO,Co3O4,andMnCO3powdersasstartingmaterials,Li[Ni1/3Co1/3Mn1/3]O2wassynthesizedbysolid-statereactionmethod.Variousgrindingaidswereappliedduringmillinginordertooptimizethesynthesisprocess.Aftersuccessiveheattreatmentsat650and950℃,thepreparedpowderswerecharacterizedbyX-raydiffraction(XRD)analysis,scanningelectronmicroscopy,andtransmissionelectronmicroscopy.Thepowderspreparedbyaddingsalt(NaCl)asgrindingaidexhibitaclearR3mlayerstructure.ThepowdersbyothergrindingaidslikeheptaneshowsomeimpuritypeaksintheXRDpattern.Theformerpowdersshowauniformparticlesizedistributionoflessthan1μmaveragesizewhilethelattershowsawidedistributionrangingfrom1to10μm.EnergydispersiveX-ray(EDX)analysissshowthattheratioofNi,Co,andMncontentinthepowderisapproximately1/3,1/3,and1/3,respecively.TheEDXdataindicatenoincorporationofsodiumorchlorineintothepowders.Charge-dischargetestsgaveaninitialdischargecapacityof160mAh·g-1forthepowderswithNaCladditionwhile70mAh·g-1forthepowderswithheptane.