简介:ThefracturebehaviorofSiCp/A356compositeatroomandhightemperatureswasstudied.Undertensilestressconditionatroomtemperature,thefractureismostlyacombinationofthebrittlefractureofSiCparticlesandductilefractureofA356matrix.Asthetensiletemperatureincreases,thecompositechangesthemainfracturebehaviortotheseparationfractureofthebondingsurfacebetweenSiCparticlesandA356matrix.Whenthetensiletemperaturereaches573K,thefracturebehaviorofthecompositesisalmostthewholeseparationfractureofthebondingsurface,whichisthemainstrengtheningmechanismathightemperature.Underthecyclestressconditionatroomandhightemperatures,themainfracturebehaviorofthecompositesisalwaysacombinationofthebrittlefractureofSiCparticlesandductilefractureofA356matrix.However,underthecyclestressathightemperature,cyclebehaviorofthecompositeschangesfromcyclehardeningatroomtemperaturetothecyclesofteningathightemperature.
简介:Byuseofmicro-DTAtechniqueaswellasambientandhightemperatureX-rayanalysisthephasediagramofNaCl-CaCl2hasbeenchecked.Itis.asimpleeutecticsystemwithasolidsolubilityinthesodiumchlorideside.Theeutecticpointisat773K,49mol%NaCl.Theexperimentalresults,especiallythoseoftheX-raydiffractionstudieshaveshowedthattheincongruentcompound4NaCl-CaCl2doesnotexistintheNaCl-CaCl2system.
简介:ThecompositionandstructureofcyclicsulfoxidederivativePd(Ⅱ)complexwereinvestigated.Thecoordinatednumberwasstudiedwithslopemethod.Thecoordinationnumberis2inloweracidity,butitis3inhigheracidity.Fourmethods,UV(ultraviolet)spectra,FrIR(Fouriertransforminfrared)spectra,1H-NMR(nuclearmagneticresonance)spectra,and13C-NMRspectra,wereusedtodeterminethecoordinatedatomincomplex.PdiscoordinatedwithOandSatominS=Ogroupinloweraciditymedia.Theconversionofcoordinationbondappearswithanincreasingtime.PdiscoordinatedwithSatominS=Ogroupinhigheraciditymedia,andinter-ligand-transferreactionoccurs.
简介:在这研究,听电影的二种类型被准备,一使用用多弧离子小块地(MAIP)的有一个在里面飞机S过滤器的过滤cathodic弧血浆(大页书写纸)技术,和其它,和两个在一样的参数下面扔了。质地,坚硬,粗糙,tribological和听电影的二种类型的电气化学的腐蚀行为的比较被给。FCAP技术获得的听电影被发现高度一致、光滑、macroparticle免费。听电影由有的大页书写纸扔了一(111)比较喜欢取向,当有时,在这些电影的质地都没由MAIP扔。在低负担下面,二种听涂层有很不同穿机制;有的大页书写纸的电影一更低与MAIP技术扔的听电影相比穿率和磨擦系数。大页书写纸的听电影的稠密、没有洞的结构能有效地在腐蚀测试期间从底层避免听电影的雪崩。
简介:StudyonGdAlDySystemMagneticRefrigerationMaterialsChangXiumin,YanJunlian(常秀敏)(闫俊联)BeijingGeneralResearchInstituteforNonferr...
简介:Lithium/polypyrrole(Li/PPy)电池作为阴极用锂表被制作,是的PPy阳极,多微孔的膜聚丙烯/聚乙烯/聚丙烯(PP/PE/PP)象电解质象隔板和LiPF6/ethylenecarbonate-dimethyl碳酸盐甲基乙醇碳酸盐(EC-DMC-EMC)合成。Polypyrrole被化学聚合准备。某些基本电气化学的表演被调查。电池的性质被SEM,galvanostatic控告/解除测试,周期的voltammetry(CV),和a.c阻抗光谱学描绘并且测试。电池的表演上的PPy阳极,塑造寒冷的压力,和电流的隔板,形态学,和电导率的影响被学习。把PP/PE/PP膜用作隔板,电池显示出好存储稳定性和骑车的性质。材料而非形态学的传导性影响了电池的行为。越高传导性,越更好表演房间。阳极小团的20MPa将使好的房间和适合的控告/解除电流的性质成为的合适的塑造寒冷的压力是0.1妈。房间与97%100%coulombic效率显示出优秀性能。95.2mAh/g的最高的分泌物能力被获得。
简介:基于密度,功能的理论(DFT)和投影机扩充了的精力充沛的计算挥动的Abinitio为决定lanthanidesesquioxidesLn_2O_3的多型性的方法(爪)(在哪儿行=稀土元素的元素,Y,和Sc),LnMO_3perovskites(在哪儿M=AlandGa),并且Ln_2B_2O_7pyrochlores(在哪儿B=Ti,Zr,和Hf)被报导。除了theC类型Ln_2O_3,相对latticest能力与立方的结构,计算全部的精力为是更加更否定的与非常估计的结果或试验性的结果同意了很好。随Ln~(3+)阳离子半径的增加,多态的结构显示出果汁饮料生产趋势。第三的氧化物陶艺的形成的热含量的趋势和数量从他们相当适合于的成分二进制代码氧化物综合了可得到的试验性的结果,和珍贵热力学的性质被负担得起到化合物,没有试验性的数据为是可得到的。两perovskitesandpyrochlores的形成的热含量趋于随Ln~(3+)阳离子半径的增加变得更否定。
简介:Thechloridizingsegregationandmagneticseparationoflow-gradenickellateritesfromYunnanprovinceofChinawasinvestigated.Thenickellateriteswerecharacterizedbymicroscopicinvestigations,usingX-raydiffractometry(XRD)andenergydispersivespectrometry(EDS)techniques.Thepellets,whichwerepreparedwithmagnesiumchlorideandcokeaschlorideagentandreductantrespectively,wereheatedtoahightemperature,andthepelletsaftercoolingwerecrushedformagneticseparation.Aseriesofexperimentswereconductedtoexaminetheeffectofchlorinatingagentdosage,reductantdosage,chloridizingtemperatureandchloridizingtimeonenrichmentgradeofNiandCo.TheresultsindicatethatthefourfactorshavesignificanteffectsontheextractionsofNiandCo.Theoptimumconditionsareasfollows:theamountsofmagnesiumchlorideandcokeare6%and2%,respectively,chloridizingtemperatureis1253K,andchloridizingtimeis90min.Undertheconditions,extractionsofNiandCoreach91.5%and82.3%,respectively.
简介:石墨材料为一节所有钒氧化还原作用流动电池被用作电极,并且电极被转变修改提高它的电气化学的行为的金属性的离子。合成电极高有的一块多孔的石墨比表面区域和高电流密度。金属性的离子改进了的转变修改的电极能催化V的催化作用行为(Ⅱ)-V(Ⅴ)氧化还原作用反应由周期的voltammograms出现了。这篇文章由电气化学的阻抗光谱学(EIS)学习了修改电极的阻抗,并且同意电极由Co~(2+)和Mn~(2+)修改了,这比修改thenon的电极有一个更低的电嗬转移电阻。平均粒子尺寸分发的效果在Warburg阻抗的斜坡被大粒子尺寸分发减少的更低的频率。Co~(2+)的电压效率修改了电极测试房间是81.5%,它比修改thenon的电极的高。
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:Basedonthephasediagrams,measuredactivitiesandtheannexationprinciple,thecalculatingmodelsofmassactionconcentrationsforIn-Pb-AgandIn-Bi-Sbternarymetallicmeltshavebeenformulated.Theresultsofcalculationbothagreewithpractice,andobeythelawofmassaction,showingthatthemodelsformulatedcanreflectthestructuralrealityofthecorrespondingmeltsandtheannexationprincipleisapplicabletothethem.
简介:TheprecipitatingkineticsofNi75Al17Zn8alloywasstudiedatboth873Kand973Kbymicroscopicphase-fieldmodel.Thecalculationresultsshowthattheorder-disordertransformationexperiencesthematrix→lowly-orderedL10phase→L12phaseat973K.AndthenucleationofL12particlesbelongstothespinodaldecompositionmechanism.Astemperatureincreases,orderingsofAlandZnatomsareresisted,butcoarseningofL12particlesispromoted.Thevalueofcoarseningkineticexponentsapproachesto1/2.Inaddition,thediscussionsaboutNi-Alanti-sitedefectandZnsubstitutionsforNisiteandAlsiteexhibitthatthehigherthetemperature,themoredistinctivetheNi-Alanti-sitedefect,butthelesstheZnsubstitution.
简介:TheeffectsofethanolsolutionsonlowerpowerArICPdischargewerestudiedbymeasuringplasmatemperatures(gastemperature,excitationtemperature,ionizationtemperatureandelectrontemperature)andelectronnumberdensities.Thetemperaturesandelectronnumberdensitieswerereducedwiththeincreasingofethanolconcentration.TheICPsystemismuchapartfromLTEconditions.Thus,ethanolsolutionswillplaceareducingeffectonspectrallineintensity.
简介:1IntroductionTherareearthcobaltalloyshavethepotentialformakingthemagneticandmagnetoopticalmaterials.Sofar,therareearthcobaltalloyfilmsaresubstantiallyproducedbysputteringorvacuumplating.Ifsuchfilmsarepreparedbyelectrodepositioninstead,productionefficiencywouldbeimprovedandthecompositionofthealloycouldbecontrolled.Becausetheoxidationreductionpotentialsofrareearthelementsareverynegative,organicsolventsmaybeusedaselectrolyticmedia.ElectrodepositionofGdCoandSmCoinorganicsolutionshasbeenreporte...