La、Fe摻雜納米復(fù)合AgSnO-,2-電接觸材料的研制及其電弧特性研究.pdf

1、萬名j主鏹斜旗學(xué)弦碩士學(xué)謹(jǐn)鉿殳論文題目：隨、、Fe摻雜納米復(fù)合Agsno。學(xué)科專業(yè)：指導(dǎo)教師：張燕王俊勃(教授)答辯委員會主任委員；答辯日期、：一屜銀虎教授)2006：33西安工程科技學(xué)院碩士學(xué)位論文PreparationandArcCharacteristicsofNanocompositeAgSn02ContactMaterialsDopedwithLaandFeAbstractAgSn02alloyisanewandinnocuo

2、usAgMeOcontactmaterial，whichhadbeingrecognizedastheoutstandingchoicetoreplaceAgCdOintheseyearsHowever，thecommercialcontactshavesomedefects，suchasthehighcontactresistance，hightemperaturerisinginuse，coarsegrains，baddispers

3、ityofoxideandlowdecentralizationofSn02Inadditionthecontactspreparedbyconventionalpowdermetallurgyprocesshavelowplasticityandtractilityhi【ghimpurityintheprocess；allofthesemustleadtothelowelectriccapabilityandprocesscapabi

4、lityInthispaperanoveltypeofAgSn02alloydoped、ⅣitlllanthanumorferricwasfabricatedbyhighenergyballmillingandsinteringThemicrostructure，electriccontactperformanceandelectricarcsevolutionofthenewnanocompositecontactmaterialsw

5、ereinvestigated，forthepurposeofprobingthenewlawsandphenomenaTheexperimentresultsshowthatthenanosizedcompoundpowderscouldbepreparedbychemicalCoprecipitation，whichdispersedhomogeneouslyNanometerMeOsizecanbecontrolledYsinte

6、ringtemperatureandtimeAfterhighenergyballmillingandsintering，thenanocompositeAgSn02seriescontactswereobtainedThemicrostructureshowstheoxideparticleshomogeneouslydispersedinthesilvermatrixandparticlessizelessthan20nmCompa

7、red、ⅣitllconventionalAgSn02In203Thenanocompositecontactshavethelowarcerosionrate；thestatisticaldistributionofbreakdownfieldofnanocompositecontactsiscentralized；theaveragebreakdownfieldofundopedandLadopednanocompositeAgSn

8、02issmallerthanthatofcommercialAgSn02Lrl203，butFedopednanocompositeAgSn02contacthasthehigherbreakdownfield；TheevolutionprocessofLaandFedopedcontactalloyhavethecharacterssuchaslongertimeforarcformation，shortertimeforarcst

9、ableburning，largervolumeandlightercolorofplasmaplumes，largernumberofcathodespotsandquickermotionofcathodespotsonthecathodesurface，cathodespotsofnanocompositecontactmaterialsuniformlydispersedonthesurfaceofthecontact，andt

10、hemeltingerosioninthearcingprocessissmallThetheoreticalanalysisshowthatthedopingLaandFeCanobviouslypreventthegrowingupofnanosizedSn02crystallitesasincreasingcalciningtemperatureandholdingtimeThenanosizedparticlessuspende