简介:在这个工作,加入铝到钢被超声进行提高的磨擦促使焊接(USE-FSW)。力量超声被一个超声的转动缝接模块同时地介绍给进金属表之一FSW过程。产生焊接,他们的微观结构和他们的腐蚀性质上的超声的效果被轻、扫描的电子显微镜学和腐蚀调查调查。USE-FSW-joints在接口在金块地区以及FeAl3的一个更薄的连续金属间化合的阶段显示出更少和更小的钢粒子。计算laminography的非破坏性的测试方法证明了眼的显微镜学为两种技术由于非多孔的关节做的观察。腐蚀调查在钠氯化物答案为ENAW-6061/DC04-hybrid关节显示出仅仅低的腐蚀电流密度和没有提高的流电的腐蚀。
简介:在一个加速腐蚀的环境系列,在疲劳和7B04-T6铝合金的腐蚀行为上,热吃惊的效果是坚定的。环境光谱也就是由二个模块组成:咸水花的腐蚀和热吃惊。机械性质上的热吃惊的效果经由张力的测试被决定;SEM,DCS,和XRD被用来在腐蚀产品上决定热吃惊的效果。另外,产品的腐蚀抵抗通过电气化学的测试被查明。结果证明铝合金的机械性质和疲劳生活将与延长热吃惊时间衰退。热吃惊过程可以比在一些艾尔的不热的吃惊标本,和转变上形成的那些导致更稠密的表面腐蚀产品(哦)3进AlOOH。AlOOH可能在腐蚀以后在疲劳生活导致了改进腐蚀抵抗和因此更低的减少,与不热的吃惊标本的相比。重复corrosion/thermal吃惊可能在疲劳生活推迟了进一步的死亡。因此,适当相等的热吃惊温度和时间的选择为设计环境光谱是必要的。
简介:介绍了通过采用水热法合成由纳米片自组装的类球形3D“微纳结构”FeP04·2H2O前驱体,再通过流变相锂化方法在650℃氩气气氛下加热10h,得到3D“微纳结构”LiFePO4锂离子电池正极材料。使用XRD、SEM对产物的晶型和形貌结构进行表征,表明该3D“微纳结构”FeP04·2H2O是由约100nm长、30nm厚的纳米片自组装而成。对该LiFePO4的电化学性能进行测试,结果显示该材料在10C、20C、30C时比容量分别达到116mAh/g、96mAh/g和75mAh/g。同时,该材料的振实密度测试结果为1.4g·cm-3这表明3D“微纳结构”的LiFeP04能较好地兼顾良好的倍率性能和较高的振实密度。
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简介:Layeredcathodematerialsofhigh-temperaturelithiumbatteries,LiNi1/3Mn1/3Co1/3O2aresynthesizedbyasol-gelmethodwithvariationinfinalsinteringtemperatureforboreholeapplications.Thestructure,morphologyandhigh-temperaturedischargeperformanceoftheseresultingproductsareinvestigatedbyX-RayDiffraction(XRD),scanningelectronmicroscopy(SEM),laserparticlesizeanalysis,galvanostaticandpulsedischarge.Theresultsofstructuralanalysisindicatethatthesamplesinteredat800℃hasthecharacteristicsofgoodcrystallinity,narrowsizedistributionandlargespecificsurfaceareaatthesametime.Thedischargeexperimentsalsoindicatethatthissamplehasthebestelectrochemicalproperties,withthemaximumdischargecapacitiesof314.57and434.14mAh·g-1at200and300℃respectivelyandtheminimumcellinternalresistancesatbothtemperatures.
简介:Anovelfluorescentprobe9-(4-(1,2-diamine)benzene-N1-phenyl)acridine(DABPA)wassynthesizedforthedetectionofnitricoxide(NO)andcharacterizedbyIR,1H-NMRandEI-MSspectroscopy.Basedonaphotoelectrontransfermechanism,thefluorescenceintensitiesofDABPAwereinvestigatedwiththedifferentconcentrationsofNO.Undertheoptimalexperimentalconditions,thefluorescenceintensityofDABPAhadagoodlinearrelationship(R2=0.9977)withNOconcentrationintherangefrom1×10-7to1.5×10-6mol/Lwithadetectionlimitof1×10-8mol/L.ThecytotoxicityinducedbyDABPAwasevaluatedbytheMTT(3-(4,5-dimethylthiazol-2-yl)-2,5diphenyltetrazoliumbromide)assayforbiologicalapplication.Furthermore,theprobeDABPAhadalsobeensuccessfullyappliedtoreal-timeimageNOproducedinPC12cellsinthepresenceofL-arginine.
简介:One-dimensional(1D)nanomaterialsandnanostructureshavereceivedmuchattentionduetotheirpotentialinterestforunderstandingfundamentalphysicalconceptsandforapplicationsinconstructingnanoscaleelectricandoptoelectronicdevices.Zincsulfide(ZnS)isanimportantsemiconductorcompoundofII-VIgroup,andthesynthesisof1DZnSnanomaterialsandnanostructureshasbeenofgrowinginterestowingtotheirpromisingapplicationinnanoscaleoptoelectronicdevices.Thispaperreviewstherecentprogresson1DZnSnanomaterialsandnanostructures,includingnanowires,nanowirearrays,nanorods,nanobeltsornanoribbons,nanocables,andhierarchicalnanostructuresetc.Thisarticlebeginswithasurveyofvariousmethodsthathavebeendevelopedforgenerating1Dnanomaterialsandnanostructures,andthenmainlyfocusesonstructures,synthesis,characterization,formationmechanismsandopticalpropertytuning,andluminescencemechanismsof1DZnSnanomaterialsandnanostructures.Finally,thisreviewconcludeswithpersonalviewstowardsfutureresearchon1DZnSnanomaterialsandnanostructures.
简介:ThetransportpropertiesintheLa2/3(Ca1-xSrx)1/3MnO3(x=0,1/3,2/3)filmspreparedusingtheRFmagnetronsputteringmethodwereinvestigated.TheeffectoftheCa,Srdouble-dopingattheApositionintheLa2/3A1/3MnO3onthestructureofthetargetsandtransportofthefilmshasbeenstudied.Withtheincreaseofx,thestructuresofthetargetstransformfromtherhombohedralphasetothecubicphase;themetal-insulatorphasetransitiontemperature(Tp)ofthefilmsincreases;andthecorrespondingpeakresistivitydecreases.Allthephenomenacanbequalitativelyexplainedbythelatticeeffect.
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简介:Theeffectsoflanthanum-praseodymium-ceriummischmetal(LPC)onthemicrostructureandmechanicalpropertiesofMg-Alalloywereinvestigated.WiththeadditionofLPC,anadditionalrod-likeAl11La3phasewasdepositedinthealloy.LPCgreatlyimprovesthetensilestrengthofcastMg-Alalloysbutnegativelyaffectstheelongationofcastalloysabove473K.Castalloysarestrengthenedbybothprecipitationstrengtheninganddispersionstrengtheningatambienttemperature.Whenthetemperatureexceeds473K,onlythedispersionoperatesasastrengtheningmechanism.
简介:从同样渗出的镁合金Mg-3%Al-1%Zn(AZ31)营舍准备的样品在低周期的疲劳测试被利用以便调查频率依赖者疲劳生活。充分颠倒的控制紧张的紧张压缩疲劳测试在空中在1Hz和10Hz的频率被执行。微观结构被光显微镜学(OM)和扫描电子显微镜学(SEM)检验。当紧张振幅比0.2%低时,疲劳生活与装载频率展出了积极关联,并且twinning的活动在10Hz被增加。当紧张振幅比0.2%高时,重要twinning在生活被发现独立于频率的这二频率,和疲劳被观察。为这频率相关的疲劳一生的可能的原因可能由于在装载频率和紧张振幅之上的twinning的依赖。