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1、ParticleSizeandMicrostructureofNiNanopowdersPrepared byAnodicArcPlasmaZhi-qiangWeiLanzhouUniversityofScience&Technology;LanzhouUniversityOutline1.Introduction2.Experimental3.Resultsanddiscussions4.ConclusionsIntroductionInrecentyears,metalnanopowdersha
2、veattractedconsiderableinterestforscientificresearchandstillisthesubjectofintenseinvestigationduetotheirintriguingpropertiesandtheirpotentialapplications,whicharedeterminedbytheparticlesizeandstructure.Consequently,theyareimportanttoalargevarietyofappl
3、ications,includingactivator,lubricator,dope,activationandsinteringmaterials,high-densemagneticrecordingmaterials,etc.Alltheseapplicationsrequirethepowderstobemadeofisolatedparticles.Theparticlesizeandthestructurestronglydependonthemethodofthenanopartic
4、leproduction.Accordingly,thepreparationmethodsandcharacterizationofthesepowdershavebeenmaintopicsinthefieldofmetalmaterials.Manytechniqueshavebeenusedtopreparenanometal–powders,suchasvapordecomposition,mechanicalcrushingbyballmilling,sol-gelprocessing,
5、gas-phasechemicalreaction,water-heatingreaction,laserhightemperatureburningmethod,etc.However,suchpowderspreparedbythesemethodsusuallycannotbeisolated.Inaddition,themajorityoftheprocesscannotbefulfilledpromptlyandgenerallycannotbeindustrialized.Commerc
6、ialexploitationofnanopowdersiscurrentlylimitedbyhighsynthesiscosts.Fromapracticalviewpoint,itisvitaltodevelopawaytomanufacturehighqualitynanopowdersinlargequantitiesatlowcosts.Forthisreason,aspeciallucrativeprocesshasbeendevelopedinourlaboratorytoprepa
7、rehighqualitynanopowders.Preliminaryresultsshowedthatthisprocessasaverypromisingtechnique,therearethreemainadvantagesbyanodicarcdischargingplasmamethod:(1)thisprocessisconvenient,inexpensiveandaneffectivepreparationmethod,(2)Thenanopowdersbythisprocess
8、withuniformsize,monodisperseandanarrowsizedistributionandhavelowimpuritycontamination;(3)ThepropertiescanbeeasyimprovedbyvaryingthetechnologyParametersintheprocess,especiallycapableofcontinuouslyproductivityandsuitableforbulkproductioni
