简介：Inthiswork,thewettability,agingandshearpropertiesofanewtypeoflead-freesolderpasteSn-07Ag-05Cu+BiNi(SACBN07)wasinvestigatedbyconductingaseriesofcomparisonexperimentswithSAC305andSAC0307solderpaste.TheresultsshowthatwettabilityofSACBN07isalmostequaltoSAC305,andbetterthanthatofSAC0307solderpaste.Thethicknessofintermetalliccompound(IMC)layerinSACBN07/Cuislowerthanthatofothertwotypesofsolderjointafteraging.AndCu_3SnlayerofSACBN07/CuisthinnerthanthatofSAC305andSAC0307.Inaddition,theSACBN07solderjointsperformthebestshearstrengthamongthesethreetypesofsolderpastes.

简介：Cesiumcontentintheseawateris3.0910-4mg·L-1,andammonium-typemordenitewasusedtoexchangecesiumfromcesiumsource.K-typemordenitewasobtainedbyhydrothermalsynthesismethod.Afterammonium-modified,ionexchangepropertiessuchassaturatedionexchangecapacitiesandselectivitycoefficientsforalkalimetalionsweredetermined.Atthesametime,ionexchangeisothermalcurvesofammonium-typemordeniteforCs+andNH4+weredeterminedat25°C.Pitzerelectrolytesolutiontheorywasusedtoworkoutactivitycoefficientsofthesystem,andtheKiellanddiagramoftheionexchangesystemwasobtained.Thecalculatedequilibriumconstant(Ka)andionfreeenthalpy(DG0)ofmordeniteforCs+andNH4+are1.455and-930.3J·mol-1,respectively,indicatingthationexchangeprocessofammonium-typemordeniteforcesiumisaspontaneousprocess.

简介：ProblemsaboutsurfacemountingprocessforfinepitchdevicesandreasonsonsolderbridgingofLtypeleaddevicesweldedaredepicted.Bridgingmechanismandinfluencefactorsareanalyzedwithtwo-dimensionalgeometricmodel.Basedonthis,high-densitysurfacemounttechnology(SMT)forfinepitchLtypeleaddevicesheatedbyscan-ninglaserisraised.SurfacemountprocessforQFP208onprintedcircuitboard(PCB)isstudied.Theresultsoftestsarethatitisquitepossibletosolvethesolderbridgingofsurfacemountingforpitchdeviceswithscanninglaser-heat-ingmethod.

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简介：Precipitationresponseofarecentlydevelopedb-typeTi–25Nb–2Mo–4Snalloy(wt%)duringagingwasinvestigatedindetail.Experimentalresultsindicatethatthemetastableωorequilibriumαphasecanformalternativelyevenunderthesameagingcondition,dependingontheconditionpriortotheaging,i.e.,solutiontreatmentorseverecoldrolling.Thisprovides,forthefirsttime,thedirectevidenceforthecompetitionbetweenωandαinagedβ-typeTialloys.Thispeculiaragingresponseisfoundtobecloselyrelatedtohigh-densitydislocationsandgrainboundarieswhichsuppresstheformationofωbutfavortheprecipitationoffineaphase.

简介：p类型(100)上的HfO2电影的乐队排列磁控管劈啪作响种的InP底层被调查。化学状态和系统的结合的特征被X光检查光电子光谱学(XPS)描绘。结果证明没有Hf-P或Hf在里面的存在，有在2在接口的O3和InPO4。紫外分光光度计(UVS)被采用获得HfO2的乐队差距价值。在3d和Hf4f，核心级的系列和原子价系列被采用获得HfO2/InP的原子价乐队偏移量。试验性的结果出现(5.88??T

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简介：在这，纸，脱臼的高密度，谷物边界和纳米规模猛抛包括严重冷滚动和短时间的退火处理通过一条thermo机械的途径被介绍给亚稳的Ti-36Nb-5Zr合金(wt%)。martensitic转变被延迟，并且有stabilizers的低内容的阶段在thermo机械的处理以后在房间温度被保留。作为结果，两低模量(57?GPa)并且高力量(950?MPa)被获得。结果显示通过微观结构优化控制martensitic转变开始温度而不是作文设计是可行策略，与制作低模量类型Ti合金的目的。

简介：NanocrystallineMg2Ni-typealloyswithnominalcompositionsofMg20Ni10–xCux(x=0,1,2,3,4,massfraction,%)weresynthesizedbyrapidquenchingtechnique.Themicrostructuresoftheas-castandquenchedalloyswerecharacterizedbyXRD,SEMandHRTEM.Theelectrochemicalhydrogenstorageperformancesweretestedbyanautomaticgalvanostaticsystem.ThehydridinganddehydridingkineticsofthealloysweremeasuredusinganautomaticallycontrolledSievertsapparatus.Theresultsshowthatalltheas-quenchedalloysholdthetypicalnanocrystallinestructureandtherapidquenchingdoesnotchangethemajorphaseMg2Ni.Therapidquenchingsignificantlyimprovestheelectrochemicalhydrogenstoragecapacityofthealloys,whereasitslightlyimpairsthecyclingstabilityofthealloys.Additionally,thehydrogenabsorptionanddesorptioncapacitiesofthealloyssignificantlyincreasewithrisingquenchingrate.

简介：Theeffectsoflow-CoAB5typehydrogenstoragealloyspreparedbyquenchingandannealingontheperformancesofMH-Nibatterieswereinvestigated,andthecharacteristicsofthelow-CoAB5typehydrogenstoragealloyswerecomparedwiththoseofthehigh-CoAB5typehydrogenstoragealloyaswell.Theresultsshowedthatthefasterthecoolingofthelow-Cohydrogenstoragealloyis,thebetterhomogeneityofthechemicalcompositionforthealloyandthelongercyclelifeofthebatteryare,buttheelectrochemicaldischargecapacityandhigh-ratedischargeabilityarereduced.Thehigh-ratedischargeabilityandchargeretentionofMH-Nibatteriesfortheconventionalas-castannealedlow-Cohydrogenstoragealloyweresuperiortothosefortherapidlyquenchedlow-Cohydrogenstoragealloyandthehigh-Cohydrogenstoragealloy,butalittleinferiorinthecyclelife.

简介：ＳｉｌｉｃｏｎＥｐｉｔａｘｉａｌＷａｆｅｒｆｏｒＸＢａｎｄＤｏｕｂｌｅＲｅａｄ－ｔｙｐｅＤＤＲＩＭＰＡＴＴＤｉｏｄｅｓｂｙＡｔｍｏｓｐｈｅｒｅ／ＬｏｗＰｒｅｓｓｕｒｅＧｒｏｗｔｈＴｅｃｈｎｉｑｔＷａｎｇＸｉａｎｇｗｕａｎｄＬｕＣｈｕｎｙｉ王向武，陆春...

简介：InordertoimprovetheelectrochemicalcyclestabilityofLa-Mg-Nisystem(PuNi3-type)hydrogenstoragealloy,NiinthealloyswaspartiallysubstitutedbyM(M=Cu,Al,Mn).AnewLa-Mg-NisystemelectrodealloysLa0.7Mg0.3Ni2.55-xCo0.45Mx(M=Cu,Al,Mn;x=0,0.1)werepreparedbycastingandrapidquenching.Theeffectsofelementsubstitutionandrapidquenchingonthemicrostructuresandelectrochemicalperformancesofthealloyswereinvestigated.TheresultsbyXRD,SEMandTEMshowthatthealloyshaveamultiphasestructure,includingthe(La,Mg)Ni3phase,theLaNi5phaseandtheLaNi2phase.Therapidquenchingandelementsubstitutionhaveanimperceptibleinfluenceonthephasecompositionsofthealloys,butbothchangethephaseabundanceofthealloys.Therapidquenchingsignificantlyimprovesthecompositionhomogeneityofthealloysandmarkedlydecreasesthegrainsizeofthealloys.TheCusubstitutionpromotestheformationofanamorphousphaseintheas-quenchedalloy,andareversalresultbytheAlsubstitution.Theelectrochemicalmeasurementindicatesthattheelementsubstitutiondecreasesthedischargecapacityofthealloys,whereasitobviouslyimprovesthecyclestabilityofthealloys.ThepositiveinfluenceofelementsubstitutiononthecyclelifeofthealloysisinsequenceAl＞Cu＞Mn,andnegativeinfluenceonthedischargecapacityisinsequenceAl＞Mn＞Cu.Therapidquenchingsignificantlyenhancesthecyclestabilityofthealloys,butitleadstoadifferentextentdecreaseofthedischargecapacityofthealloys.