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首页 Wuhan institute of technology materials 08 retry

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Wuhan institute of technology m…

爱情d失控
2018-04-26 0人阅读 举报 0 0 暂无简介

简介:本文档为《Wuhan institute of technology materials 08 retrydoc》,可适用于社会民生领域

WuhaninstituteoftechnologymaterialsretryWuhaninstituteoftechnologymaterialsretryWhatistheconceptofmaterialscienceandengineeringWhatarethefourelementsWhatarethethreecharacteristicsMaterialscienceandengineeringistheknowledgeandapplicationoftherelationshipbetweenmaterialcomposition,structure,preparationprocessandmaterialperformanceThefourelementsare:compositionandstructure,synthesisandproductionprocess,performance,useefficiencyMaterialscienceandengineeringcharacteristics:Multidisciplinecrossmaterialscienceandengineeringandphysics,chemistry,metallurgy,metallography,ceramics,computationalmathematics,etchasadistinctphysicalmaterialsscienceisanactual,servefortheeconomicconstruction,isanappliedscienceTheresearchresultsinlabmustpasstheengineeringresearchanddevelopmenttodeterminereasonabletechnologicalprocess,thefinalbulkproductionmeetstherequirementsofengineeringmaterialsThescienceofmaterialscienceindevelopmentisnotascompleteasmechanicsandelectricity,itisasubjectthatisconstantlydevelopingWhatarethetwohotissuesofthemajorAfuelcellNearlytwo,thirtyyears,duetoalackofenergyandenvironmentalprotection,forthedevelopmentandutilizationofnewcleanandrenewablesourcesofenergy(fuelcellswithhighenergyconversion,theadvantagesofsmallpollutiontotheenvironmentispaidgreatattentiontobyallcountriesintheworld)AfuelcellisanefficientenergyconversiondevicethatconvertsthechemicalenergythatprovidesfueldirectlyintoelectricityItisthefourthgenerationofpowergenerationtechnology,whichiswater,powerandnuclearpowerItscharacteristicsare:Duetothechemicalenergydirectlyintoelectricity,comparedwiththegeneralpowergenerationway,toavoidthechangesintheformofenergyisnotlimitedbycarnotcycle,highenergyconversionefficiencyInaddition,duetothelackofmovingpartsinthebattery,theworkisveryquietTheloadresponseofthebatteryisgoodandreliableCarbonnanotubesIsaonedimensionalquantummaterialswithspecialstructure(theradialsizeofnanoscale,axialsizeformicronlevel)Itismainlycomposedofhexagonalarrayonthenumberofcarbonatomslayertodozensoflayersofconcentriccirculartube,maintainingaconstantdistancebetweenlayerandlayerAsonedimensionalnanomaterials,theweightislight,thehexagonstructureisconnectedperfectly,hasmanyabnormalmechanics,electricalperformance:mechanicalpropertiesItsdensityisonlyaboutofthesteel,thestructureissimilartopolymermaterials,butthetensilestrength,modulusofelasticityoftpa,withitsenhancedplasticexcellentmechanicalpropertiesandresistancetofatigue,creep,smalldeformationandslidingperformanceisgoodelectricalperformanceadvantageofthecharacteristicsofthehollowstructure,canbeusedformouldmanufacturingsomenanoscalemetalwireSomepipediameterofcarbonnanotubesisagoodconductorofperformanceisbetterthanthatofgraphitematerial,otherpipediametercouldbeasemiconductorperformanceofthermalconductivityHasaverylargelengthtodiameterratio,andthusitsalongthelengthdirectionoftheheattransferperformanceishigh,theverticaldirectionofheattransferperformanceislow,itcanbemadeintohighanisotropicheatconductionmaterialTherearealotofnewmethodsformaterialsynthesisandpreparationForexample,oneofthemshouldbeexplainedPlasmachemicalvapordepositionmethod(PCVD)PVCDisbymeansofplasmainhighenergyelectronandreflectthegasatoms,moleculesofinelasticcollisiondissociationandionization,resultinginalargeamountofyuandepositgroups,suchasatoms,ionsoractivegroupanddepositionfilmtothesubstratesurfaceNonequilibriumplasmaactivationisthemainadvantageofPCVDinsteadoftraditionalheatingactivation,whichcanreducethedepositiontemperatureofthesubstrateBecauseofitslowdepositiontemperatureanddepositionrateisfast,goodplating,equipmentoperationandmaintenanceissimpleandwidelyusedfordepositingfilmandhardfilmThismethodofhighpurity,membranedensity,formationofcrystaldirection,intheelectronicindustryarewidelyusedinthepreparationofhighpuritymaterialsandcrystalmaterialsThechemicalreactionsinvolved:pyrolysis,REDOXreaction,compoundreductionreaction,etcSolgelSolgelmethodreferstoorganicorinorganiccompoundsaftersolutionsolgelandcuringAfterheattreatmentandoxideorothercompoundwassolidmethodBecauseofthesolgelprocesshashighpurity,homogeneity,lowprocessingtemperature,thereactionconditionstheadvantagesofeasycontrolandwidelyusedinspecialopticalglass,specialfilm,ultrafinepowder,compositematerials,opticalfiber,biologicalmaterialsandotherfieldsItsmainfeaturesare:Lowtemperaturesyntheticoxide,whichmakesitpossibletomakeproductsthatcannotbeheatedathightemperatureIncreasetheuniformityofthematerial,themulticomponentsolutionisthemolecularlevel,theatomiclevelmixingIncreaseproductivityItismadeofmaterialssuchasblockmaterials,fibermaterials,coatingandfilmmaterials,ultrafinepowdermaterialsandcompositematerialsThereactionsinvolvedare:ThereactionofhydrolysisCondensationSelecttestmethodsandsummarizetheircontentXPS(Xrayphotoelectronspectroscopyanalysis)Electronicenergyspectrumisinrecentdecadesdevelopedakindofresearchonmaterialsurfacepropertiesandthestateoftheemergingphysicalmethod,inthiscase,thesurfaceofsolidoftheoutermostlayersinthesurfacelayeroftheatom,generallytoseveralnmXrayphotoelectronspectroscopyisuseforexcitationsource,shottosampletheliningoftheelementsintheelectronic,anddirectmeasurementofsecondaryelectronenergy,theenergyperformancefortheelementofinnerelectronbindingenergyEb,Ebvariesaccordingtotheelements,andhashighresolution,canbegotfromvalenceelectronstoKshellelectronionizationenergyatalllevels,contributestoanunderstandingofiongeometricconfigurationsandorbitalbondingpropertiesTheformulaisderivedfromthephotoelectriceffectApplicationofXPS:chemicalanalysis:thecomponentanalysisofelementsandquantitativeanalysisofsolidsurfacestostudythestructureofcompoundsCanbeusedforcementhydrationcalciumsilicateinthesurfaceanalysisofOspeaksinthespectrumanalysisandpeakwidthchangethedirectionofthemobilecandeterminethehydrationreactioniscarriedoutforthedeterminationofsurfaceESCACaSiratiocananalyzethehydrationprocessanditsproductTransmissionelectronmicroanalysisTransmissionelectronmicroscopy(sem)isusedafocusedelectronbeamasthelightsource,uniformirradiationtosampleasmallareatobeseen,duetotheuseofelectronbeamtransparentfilmsample,somostoftheelectronicthroughthesample,theintensitydistributionandobservedthemorphologyofsamplearea,organizationandstructureThetransformationcanshowtheimage,organization,andstructureoftheimageonthescreenThecontrastofitselectronicimageisderivedfromqualitycontrast,diffractioncontrastandphasecontrastTransmissionelectronmicroscopyisahighresolution(nmresolution)andamagnification(,times)microscopeItissuitableforobservationandanalysisofthematerialappearance,structure,thedislocationofthecrystal,thefaultofthelaminate,theemptygroupandothercrystaldefectsTransmissionelectronmicroscopyrequiresasamplethicknessoftonanometers,oreventensofnanometers,tobe"transparent"totheelectronbeamTherearethreekindsofsamples:superfinepowderparticles,thinfilmswithacertainmethod,andthecomplexmembraneofthesurfaceofthematerialbythecomplexmethodThisisthesecondinterviewquestionoftheyearandtheanswer,whichisbasicallythis,theback

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