简介：本文采用放电等离子烧结技术烧结Fe-2Cu-1.5Ni-0.5Mo-0.8C混合粉末,并通过建立致密化模型,详细讨论粉末的快速致密化过程.结果表明,当升温速率为100℃/min,在1000℃保温5min,混合粉末可获得近乎全致密烧结体.由传统压制方程建立的致密化模型,其拟合结果与实验烧结位移曲线基本一致,压坯的快速致密化主要通过颗粒重排、局部塑性变形、整体塑性变形三个阶段实现.
简介：摘要：在溶剂热条件下合成了两种新型硒代锡酸盐[Fe(en)3]2Sn2Se6 (1) 和[Ni(tren)(en)]2SnSe3∙H2O (2) (tren =三(2-氨基乙基)胺，en = 乙二胺)、，化合物1，2均由过渡金属(TM)配合物与二聚体[Sn2Se6] 阴离子组合而成，化合物2中还存在一个水分子，水分子参与了扩展氢键的作用，形成了氢键网络。值得关注的是，两个化合物表现出较好的光电流响应(ca.86 μA/cm (1)和84 μA/cm (2))，表明这两种化合物具有较高的光电子转移和光电子空穴对分离效率。本文首次研究了混合乙烯多胺与TM同时存在的硒代锡酸盐对亚甲基蓝(MB)的降解率， [Fe(en)3]2Sn2Se6为41 %，[Ni(tren)(en)]2SnSe3∙H2O为36 %，拓宽了硒代锡酸盐的光电研究领域。
简介：Cu和Ni原子经历liquid–solidelectromigration(L-S他们)的散开行为用Cu/Sn/Ni被调查在5.0×103在250°C的2。电子的流动方向显著地影响Cu和Ni原子的跨solder相互作用，即在顺风的散开下面，Cu和Ni原子能扩散到相反的接口；当在迎风的散开，Cuatoms然而并非Ni下面原子能扩散到相反的接口时。当电子从Cu流动到Ni时，仅仅Cu原子扩散到相反的阳极Ni接口，导致从Ni3Sn4进(Cu，Ni)6Sn5并且进进一步[(Cu，Ni)6Sn5+Cu6Sn5],当noNi原子扩散到相反的阴极Cu接口并且这样时界面的Cu6Sn5留下了。从Ni的Whenelectrons流动到Cu，Cu和Ni原子扩散到相反的接口，resultingin从起始的Cu6Sn5进(Cu，Ni)6Sn5并且进进一步[(Cu，Ni)6Sn5+(Ni,Cu)3在阳极Cu接口的Sn4]当时那从起始的Ni3Sn4进(Cu，Ni)6Sn5并且进进一步(Ni，Cu)3在阴极Ni接口的Sn4损坏，电子比另外的方法从Cu流动到Ni是更多的。
简介：DensityofmoltenNiandNi-Walloyswasmeasuredinthetemperaturerangeof1773～1873Kwithasessiledropmethod.ThedensityofmoltenNiandNi-Walloystrendstodecreasewithincreasingtemperature.ThedensityandmolarvolumeofthealloystrendtoincreasewithincreasingWconcentrationinthealloys.ThecalculationresultshowsanidealmixingofNi-Walloys.
简介：NanocrystallineNi粉末成功地被制作由机械地在有1个wt.%Y_2O_3粒子的低温实验法的温度(cryomilling)的milling。试验性的结果证明了Ni谷物尺寸面对Y_2O_3粒子在cryomilling的2h以后被归结为25nm。cryomilledNi/Y_2O_3粉末能维持他们的nanocrystalline结构直到900℃，否则融化中的62%个Ni指。有约100nm的athermally稳定的谷物尺寸的体积nanocrystallineNi/Y_2O_3材料被cryomilling生产，冷均衡说的紧迫，由热均衡说的压列在后面。体积nanocrystallineNi/lwt.%Y_2O_3的微坚硬是315DPH，它二倍高于常规Ni的。
简介：ToseparatethecadmiumandnickelresourcesinwasteNi-Cdbatteries,aself-designedvacuumdistillationrecyclingsystemwasstudiedunderlaboratoryconditions.Theeffectsofsystemtemperature,operatingpressure,andtimeontheseparationofNiandCdwerestudiedrespectively.Themechanismofvacuumthermalrecyclingwasalsodiscussed.ResultsshowthatvacuumdistillationisaveryeffectiveseparationmethodforwasteNi-Cdbatteries.AtaConstantpressure,theincreaseoftemperaturecanimprovetheseparatingefficiencyofCd.Whenthetemperatureis1173K,Cadmiumcanevaporatecompletelyfromthesamplesduring3hat10Pa,ThereductionofpressureinacertainrangeiseffectivetotheseparatingofCdfromNi-Cdbatteriesbyvacuumdistillation.
简介：ToreducetheproductioncostofBi-2223superconductingtapes,Bi-2223/Ag/Nitapeswerefabricatedbythepowder-in-tubeprocess.TheeffectofheattreatmentonthemicrostructureandcriticalcurrentoftheBi-2223/Ag/Nitapeswerestudied.ThephasecompositionsofthesampleswerecharacterizedusingXRD.ThemicrostructurewasobservedusingSEM.ExperimentalresultsindicatethathighertemperatureismoreconducivetotheformationofBi-2223phaseatanatmosphereof8.5%O2.Afterthetwo-steph...
简介：Thesimulationofnanoindentationintosinglenickelcrystalisperformedbyusingquasicontinuummethod.Thestrainenergy-displacementandload-displacementcurvesarepresentedtostudythemechanicalbehaviorofthedislocationnucleation.Thecharacteristicsofthestackingfaultanddislocationnucleationaredeterminedbycalculatingthecentro-symmetryparametersandanalyzingthedisplacementfieldoftheatomsbeneaththeindenter.Thestructureofthestackingfaultandthecharacteristicsofdislocationobtainedinthesimulationbyquasicontinuummethodarereproducedinthesimulationbymoleculardynamics.
简介：ThesecondaryhardeningreactionisaccompaniedwithprecipitationoffinecarbidesinhighCoNiultrahighstrengthsteel.Thecrystalstructureoftheprecipitatingcarbidesisunambiguouslydeterminedbymicrobeamdiffractionintransmissionelectronmicroscopy.Itisidentifiedthattheneedle-shapedcarbidesareM2Cwithahexagonalstructure.TheconcentrationofsubstitutionalalloyingelementsinthecarbidesquantifiedbyenergydispersiveX-rayspectroscopy(EDS)alsosupportstheresultabove.ThespatialstructureofM2CisidenticalwithL'3type.Metalatomsareinaclosepackedhexagonalstructure,thecarbonatomspartlydistributewithrandomintheoctahedralintersticesandthefillingprobabilityislessthan1/2.Particularattentionwaspaidtotherelationshipofneedle-shapedcarbides/ferritematrixatsecondaryhardeningpeaktemperedat482℃for5h.Observationbyhighresolutiontransmissionelectronmicroscopy(HRTEM)confirmsthatcarbideswithblack-whitecontrastarefullycoherentwithferriteandhaveindividualcrystalstructure,andthecoarsenedcarbideswithmoirefringearepartiallycoherentwithmatrix.TheorientationrelationshipbetweenM2CandferritematrixisdirectlyobservedandidentifiedwiththewellestablishedP-Srelationship[001]α//[111]c.
简介：Threetypesofcarbonnano-onions（CNOs）includingNi@CNOs.Fe3C@CNOsandFe0.64Ni0.36@CNOsnanoparticleshavebeensynthesizedbycatalyticdecompositionofmethaneat850℃usingnickel,ironandiron-nickelalloycatalysts.Comparativeandsystematicstudieshavebeencarriedoutonthemorphology,structuralcharacteristicsandgraphiticcrystallinityoftheseCNOsproducts.Furthermore,theelectrochemicalhydrogenstoragepropertiesofthreetypesofCNOshavebeeninvestigated.MeasurementsshowthattheNi@CNOshavethehighestdischargecapacityof387.2mAh/g,coiTespondingtoahydrogenstorageof1.42%.ThiscomparisonstudyshowstheadvantagesofeachcatalystinthegrowthofCNOs.enablingthecontrollablesynthesisandtuningthepropertiesofCNOsbymediatingdifferentmetalsandtheiralloyforusinginthefuelcellsystem.
简介：Stenoscepasp的美女。在在在Mpumalanga省的蛇的地点的Ni亢奋的蓄电池Berkheyacoddii的叶子的feed，南非。这些地点在正常范围与Ni集中包含Nihyperaccumulators，Ni蓄电池，和植物。Weconducted学习到：(ⅰ)决定美女的整个身体的金属集中(包括那些饥饿倒空他们的勇气)；(ⅱ)比较Stenoscepasp。对在为整个身体的金属集中的一样的产地的另外的蚂蚱的美女；并且(ⅲ)当食物为Stenoscepasp采购原料，比较Nihyperaccumulator和Ni蓄电池植物的适用性。并且另外的蚂蚱。Stenoscepa美女有极其高整个身体的Ni集中(3500μgNi/g)。这是部分由于在内脏的食物使少些包含的昆虫饿了.Stenoscepa美女比另外的蚂蚱更好显著地熬过的Ni(950μgNi/g)从也收集了一serpentine或一个非蛇的地点当作为食物提供了high-Ni植物时。在在四Berkheya种(二个Ni亢奋的累加器和二个Ni累加器)之中的主机偏爱测试，Stenoscepasp.preferredNi亢奋的累加器种类离开。使用的一个偏爱实验threeSenecio种类离开(哪个种类，Seneciocoronatus，被Nihyperaccumulator和一张Ni蓄电池人口代表)显示出那Stenoscepasp。比较喜欢的NiaccumulatorSeneciocoronatus离开到所有另外的选择。我们结束那Stenoscepasp。是极其Ni容忍的。Stenoscepasp。美女比较喜欢亢奋的蓄电池Berkheya种类的叶子，但是提高的Ni集中独自不决定他们的食物偏爱。我们建议Stenoscepa美女的极其高整个身体的Ni集中可以在这些蛇的社区影响食物网关系。
简介：Flexiblethin-filmsupercapacitorswithhighspecificcapacitancearehighlydesirableformodernwearableormicro-sizedelectricalandelectronicapplications.Inthiscontribution,Ni-Cohydroxides(NCH)nanosheetsweredepositedontopofNi-Cualloy(NCA)nanowirearraysformingafreestandingthin-filmcompositeelectrodewithhierarchicalstructureforsupercapacitors.Duringelectrochemicalcycling,thedissolutionofCuintoCuionswillcreatemoreactivesitesonNCA,andtheredepositedcopperoxidecanbecoatedontoNCH,givingrisetosubstantialincreaseinspecificcapacitancewithcycling.Meanwhile,NCAandNCHhaveexcellentconductivity,thusleadingtoexcellentrateperformance.Thisflexiblethin-filmelectrodedeliversanultrahighinitialspecificcapacitanceof0.63F·cm~(-2)(or781.3F·cm~(-3)).Duringcharge-dischargecycles,thespecificcapacitancecanincreaseupto1.18F·cm~(-2)(or1475F·cm~(-3))alongwiththe'self-etching'process.Theelectrodepresentsabetterspecificcapacitanceandratecapabilitycomparedwithpreviouslyreportedflexiblethin-filmelectrode,andthisnoveldesignofetchingtechniquemayexpandtootherbinaryorternarymaterials.
简介：Afacilestep-by-stepapproachisdevelopedforsynthesizingthehigh-efficiencyandmagneticrecyclableFe_3O_4@SiO_2@Ag@Nitrepang-likenanocomposites.ThismethodinvolvescoatingFe_2O_3nanorodswithauniformsilicalayer,reductionin10%H_2/AratmospheretotransformtheFe_2O_3intomagneticFe_3O_4,andfinallydepositingAg@Nicore-shellnanoparticlesontheL-lysinemodifiedsurfaceofFe_3O_4@SiO_2nanorods.Thefabricatednanocompositesarefurthercharacterizedbyx-raydiffraction,transmissionelectronmicroscopy,scanningelectronmicroscope,Fouriertransforminfraredspectroscopy,andinductivelycoupledplasmamassspectroscopy.TheFe_3O_4@SiO_2@Ag@Nitrepang-likenanocompositesexhibitremarkablyhighercatalyticefficiencythanmonometallicFe_3O_4@SiO_2@AgnanocompositestowardthedegradationofRhodamineB(RhB)atroomtemperature,andmaintainsuperiorcatalyticactivityevenaftersixcycles.Inaddition,thesesamplescouldbeeasilyseparatedfromthecatalyticsystembyanexternalmagnetandreused,whichshowsgreatpotentialapplicationsintreatingwastewater.
简介：采用共沉淀法制备了不同Zn掺杂量的Li（Ni1/3Co1/3Mn1/3）1-xZnxO2（x=0-0.08）固溶体,通过X射线衍射（XRD）和光电子能谱（XPS）分析,研究了不同Zn掺杂量对Li（Ni1/3Co1/3Mn1/3）1-xZnxO2固溶体晶体结构和过渡金属表面化学状态的影响。实验结果表明：当Zn掺杂量x小于0.006时,固溶体材料具有稳定的层状结构;微量Zn的掺杂能够增强晶体材料的整体键能。
简介：三元材料LiMn1/3Ni1/3Co1/3O2比容量高,结构稳定,热稳定性好,成本低,是锂离子电池正极材料市场最具竞争能力的材料之一.重点总结和分析了三元材料掺杂、表面修饰等改性方面的研究,并对其未来的发展前景进行了展望.
简介：通过前处理，在聚甲基丙烯酸甲酯微球表面形成活性中心，采用化学液相沉积法．在微球表面沉积镍合金层，制成了单分散PMMA／Ni复合粒子，采用XPS、XRD、SEM、比表面分析仪、微米激光粒度分布仪等多种分析测试方法对制得的复合粒子的结构及性能进行表征，结果表明：制备的复合粒子大小约10μm，呈单分散性，分散度在0．025左右，包覆层呈较好的球形，结构致密，形状规则，具有一点的柔软度，合金层大约在0．5μm，主要成分为含高磷的镍磷合金。
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![两种新的零维团簇结构硒代锡酸盐[Fe(en)3]<b style='color:red'>2</b>Sn<b style='color:red'>2</b>Se6 和[<b style='color:red'>Ni</b>(tren)(en)]<b style='color:red'>2</b>SnSe3∙H<b style='color:red'>2</b>O的溶剂热合成及表征](/image/thesis1 "两种新的零维团簇结构硒代锡酸盐[Fe(en)3]<b style='color:red'>2</b>Sn<b style='color:red'>2</b>Se6 和[<b style='color:red'>Ni</b>(tren)(en)]<b style='color:red'>2</b>SnSe3∙H<b style='color:red'>2</b>O的溶剂热合成及表征")
![Improved electrochemical performances of yttrium oxyfluoride-coated Li[Li0.2Mn0.54<b style='color:red'>Ni</b>0.13Co0.13]O<b style='color:red'>2</b> for lithium ion batteries](/image/thesis17 "Improved electrochemical performances of yttrium oxyfluoride-coated Li[Li0.2Mn0.54<b style='color:red'>Ni</b>0.13Co0.13]O<b style='color:red'>2</b> for lithium ion batteries")
