简介：

简介：Ferrumniobatewassynthesizedbysolid-phasesinteringmethodinavacuumcarbontubefurnaceat1300℃for180min.ThephasetransformationofferrumniobatecarbothermalreductionprocesswasstudiedbyXRD.ThereductionreactionsofferrumniobateindifferenttemperaturestagesweredeterminedbytheTG-DSCcurve.Meanwhile,accordingtotheTGcurve,thereactionkineticsparameterswerecalculatedbyA.W.Coatsintegrationandthecontrolstepsindifferenttemperaturestageswereascertained.Theresultsshowedthatthereductionofferrumniobatestartsatthetemperatureof1000℃,andthereductionprocesscarriesoutintwostepsaccordingtosinteringtemperature.Inatemperaturerangeof1000-1238℃（thefirststep）,themainreductionproductsareNbO2andFe;thekineticequationofinitialstageis[-ln（1-α）]4=kt,controlledbynucleationgrowth,andtheapparentactivationenergyis388kJ/mol;withthetemperatureincreasing,thekineticequationisα＋（1-α）ln（1-α）=kt,whichistheValensitwo-dimensionaldiffusionkineticequation,andtheapparentactivationenergyis264.4kJ/mol.Themainreactioninarangeof1238-1344℃（thesecondstep）isthereductionofNbO2toNbC,thekineticequationis[（1-α）-1/3-1]2=kt,whichiscontrolledbythethree-dimensionaldiffusion,andtheapparentactivationenergyis482.7kJ/mol.

简介：三维的磨擦促使焊接(FSW)过程模型基于液体力学被开发了。在焊接过程的材料运输被认为是laminar，粘滞、非牛顿经过一根旋转大头针流动的液体。划分焊接地区的一个标准根据速度地和粘性地的合作被给了。也就是说，在工具大头针附近存在的0-easy-flow地区对应于焊接金块地区；在0-easy-flow地区和1粘性乐队之间的区域被通信到热机械的影响地区(TMAZ)。模型给一些有用信息通过速度分发的模拟结果在FSW改进材料流动的理解。为了估价磨擦，促使大头针设计，三种大头针几何学，一个人是列大头针，第二是逐渐变细大头针，和最后大头针是螺丝钉线程逐渐变细大头针，在模型被使用。大头针几何学严重在0-easy-flow地区影响了速度分发的模拟结果。在0-easy-flow地区的速度分发能被看作优化磨擦的标准搅动工具设计。这研究将受益指导磨擦搅动工具设计。

简介：有在早年龄的时间的电的抵抗力的变化被用来调查水和进程和孔开发。基于水泥的材料水和的孔减小过程被一个建议方法开发。孔减小在设定的时期是快的。结果发现毛孔断绝比在类似于过滤方法的结果的高水位线比率在更低的水/水泥比率更快发生。

简介：Amodelwaspresentedtodescribethemicrostructureevolutionduringthedirectionalsolidificationprocess.Inthismodel,theproblemofdifferentpropertiesinthesolidandliquidphasewassolvedbymakingthepropertiescontinuousatthesolid/liquidinterface.Furthermore,arandomnoisewasincorporatedtoreflecttheanisotropicgrowth.Moreover,theaveragingsoluteconservationwasdevelopedtokeepthetotalsoluteconservationintheinterfaceregion.Asimpleingotwassimulatedbythismethod,themodelcanrepresentthemicrostructureevolution,soluteconcentrationredistribution,micro-segregationandthecolumnar-to-equiaxedtransition.

简介：减少形成的负担，springback的删除，象生产高力量一样增加表的formability分开是主要原因使用热踩过程。热踩过程和22MnB5钢分别地是现状过程和等级；然而新奇的过程和钢等级在考虑下面。在当前的研究，在半和充分热的踩过程下面的钢等级MSW1200空白的行为被描绘。在半热的踩的过程期间，空白第一被加热到大约650的温度

简介：交流阻抗是一个新方法由电气化学的参数的变化在水和和水泥浆糊的变硬的过程期间学习毛孔结构和水和度的变化。采用的交流阻抗方法，我们与苍蝇灰和炉渣学习了水和和水泥浆糊的变硬的过程，并且在阻抗参数上分析了不同水和年龄，水文件夹比率和矿物质混合的影响。而且，我们由测试方法和X光检查衍射的常规孔把结果与那些作比较方法。结果证明那交流阻抗能在水泥和具体研究作为一种新技术被拿。

简介：CuSpinealmicrospherescongregatedfrominterleavingnanoflakeswiththicknessof40to200nmweresynthesizedbyapyridine-solvothermalprocessviathereactionbetweencupricchloride(CuCl2·2H2O)andthioacetamide(TAA,CH3CSNH2).TheproductswerecharacterizedbyX-raydiffractionandscanningelectronmicroscopy.UV-Visabsorptionspectrum,excitationandphotoluminescencespectraofCuSpinealmicrosphereswereobtainedatroomtemperaturetoinvestigatetheiropticalproperties.ApossiblegrowthmechanismontheformationofCuSpinealmicrospheresisproposed.ThefactorsinfluencingtheevolutionofmorphologiesofCuScrystalsincludingthedosageofthereactants,surfactant,andsulphur-sourcewerealsoanalyzed.

简介：Thepurposeofthisresearchistoquantifytheeffectsofcompositionalandprocessingparametersonthemicrostructureandpropertiesofdualphasesteelproduceddirectlybyhotrollingandrapidcooling.Steelswiththebasecompositionof0.1%C,1.4%Si,and1.0%Mnwithadditionsof0.5%Crtoinfluencehardenability,0.04%Nbtoretardrecrystallizationinthelatterstagesofrolling,or0.02%Titoinhibitgraingrowthduringandafterreheatingwereinvestigated.Investigationwasmadetopredictmicrostructureevolutionandtocorrelatemicrostructurewithprocessingparameters.Theeffectsoftheimportantmicrostructureparameterssuchasferritegrainsize,martensitevolumefraction(VM)andmorphology(polygonalorfibrous)onthetensileandimpactpropertiesarediscussed.Multiplelinearregressionanalysisoftheultimatetensilestrengthhasshownthat,increasingVMandmartensitemicrohardnessandgrainrefinementofferritearethemajorcontributionstoincreasethestrengthofthesteel.Itwasfoundthatthedual-phasesteelproducedbycontrolledrollingprocess,withamicrostructurewhichconsistedoffinegrainedferrite(4μm)and35%～40%fibrousmartensite,presentedoptimumtensileandimpactpropertiesbecauseofenhancedresistancetocrackpropagation.

简介：吸引从西方的湖北省鲕状的赤铁矿矿石烤被调查。为减小烤鲕状的赤铁矿矿石的机制被讨论并且分析。它被发现那闪光吸引烤磁性分离过程是为从西方的湖北处理鲕状的赤铁矿矿石的一条有希望的途径省。

简介：活跃的催化的种是否在在CNT或另外的nanowire生长期间的液体，稳固的阶段，表面premelting或表面过程，是争论的。以便为催化地成年的碳nanotube(CNT)探索机制，为在不同温度下面种的CNT的机制尝试性地被建议。与乙醇化学药品蒸汽免职(CVD)，碳n.anotubes(CNT)作为催化剂用钴(公司)在Si底层上controllably被综合。CNT生长上的公司粒子尺寸，生长温度和乙醇压力的效果被调查。在生长温度的不同范围的公司粒子尺寸上的CNT生长的不同依赖被发现。

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简介：在这个工作，有大约100nm和一段几测微计的一致直径的TiO2nanorods被大音阶的第五音胶化模板方法成功地准备。另外，准备的beeninvestigated.The取样的TiO2的形态学和nanorods有的结构上的先锋的臼齿的比率的影响被Fourier变换描绘红外线的光谱学(FTIR)，X光检查衍射(XRD)和扫描电子显微镜学(SEM)。XRD结果显示TiO2nanorods在锐钛矿和金红石阶段被使结晶，在退火到直到2h的400-700°C以后。

简介：Amodelcombinedbothmacroscopictransportandmicrostructuralevolutionisappliedtodescribetheinfluenceofthermosolutalconvectiononmicrostructuralevolutionduringthesolidificationprocess.Firstly,thevolumeaveragemethodandSimpleralgorithmareusedtosolvethemacroscopictransportequation.Thenthecalculatedresultsareincorporatedintothecellularautomaton(CA)modeltosimulatethemicrostructuralevolution.Usingthismodel,asimplecastingingotisappliedtosimulatemicrostructuralevolution.Throughthesimulation,itisfoundthatthethermosolutalconvectionhasastronginfluenceontheredistributionoftemperaturefieldandsolutefield,whichinfluencethesolidificationmicrostructuralevolution.

简介：Sheetmetalformingiswidelyappliedtoautomobile,aviation,spaceflight,ship,instrument,andapplianceindustries.Inthispaper,basedonanalyzingtheshortcomingofgeneralfiniteelementanalysis(FEA),theconceptionofparametricfiniteelementanalysis(PFEA)ispresented.Theparametricfiniteelementanalysis,artificialneuralnetworks(ANN)andgeneticalgorithm(GA)arecombinedtoresearchthoroughlyontheproblemsofprocessparametersoptimizationofsheetmetalforming.Theauthorprogramstheoptimizationschemeandappliesitinaresearchofoptimizationproblemofinsidesquareholeflangingtechnologicalparameters.Theoptimizationresultcoincideswellwiththeresultofexperiment.Theresearchshowsthattheoptimizationschemeoffersagoodnewwayindiedesignandsheetmetalformingfield.

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简介：Thehydrodynamicdeepdrawingprocessenablesnetshapeornearnetshapeformingofcomplicatedsheetmetalpartsmadefromdifficultlyformingmaterials,suchasaluminiumorhighstrengthsteels.Basedontheconventionalhydrodynamicdeepdrawingprocess,anewprocess,hydrodynamicdeepdrawingprocess,inwhichradialpressureisappliedtotherimoftheblank,isproposed.ThisnewprocesshasbeenanalysedusingFEMsimulationsandtheobtainedresultshavebeencomparedwiththeexperimentalresults.ThematerialusedintheexperimentswasAl-Mg-Sialloy,andintheFEM-simulationstheelastic-plasticbehaviourofAl-Mg-SialloywasmodelledusingBarlat's89yieldcriteria.

简介：Withtheaidofthelatestfiberopticsensingtechnology,parametersinthecureprocessofthermosettingresin-matrixcomposite,suchastemperature,viscosity,voidandresidualstress,canbemonitoredentirelyandefficiently.Inthispaper,experimentresultsofviscositymeasurementincompositecureprocessinautoclaveusingfiberopticsensorsarepresented.Basedonthesensedinformation,acomputerprogramisutilizedtocontrolthecureprocess.Withthistechnology,thecureprocessbecomesmoreapparentandcontrollable,whichwillgreatlyimprovethecuredproductsandreducethecost.

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简介：AhypereutecticAl-Sialloypowderwaspreparedbyultrasonicgasatomizationprocess.Themorphologies,microstructureandphaseconstituentofthealloypowderwerestudied.TheresultsshowedthatpowderofthealloywasveryfineanditsrnicrostructurewasmainlyconsistedofSicrystalsplusintermetalliccompoundAl9FeSi3,whichwere.veryfineanduniformlydistributed.