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1、贵州大学硕士学位论文阻燃镁合金研究姓名:陈延超申请学位级别:硕士专业:有色金属冶金指导教师:尹卓湘20080601贵州大学2008届硕士研究生毕业论文AbstractAsthelightestmetalstructurematerial.magnesiumalloysarefoundusingwidelyinautomotive.electronicandaeronauticalindustriesbecauseofanumberofdesirablefeatures。includinghighspecific
2、strength,highspecificstiffness,goodmagnetic。shieIdingability,gooddampingability,goodmachinabilityandrecycledeasily.Magnesiumalloyispronetobeoxidizedandburningdunngthemeltingprocessinairforitshighoxygenaffinity,whichlimitsitslarge-scaleindustrialapplications.
3、Atpresent。fluxesandprotectivegasesarecurrentlyusedforthemeltingandproductionprocesses,butbothmethodsstillremainmanyproblemssuchasenvironmentalpollutinggreatly、devicescomplicatedandproductqualityunstable,sothatweshouldlookforamoreeffectivemethodasbumingprohib
4、itor.Alloyingisapromisingmethodofpreventingmagnesiumalloyfrombuming.Accordingtothemetaloxidationtheory,thepaperhasafurtherstudyontheoxidationthermodynamicandkinetic,andgetsthestructureandgrowthregularityoftheoxidefilmontheignition-proofmagnesiumalloy.Alloyin
5、gisusedforpreventingmagnesiumalloyfrombumingdunngmelting.Bytheadditionofalloyingelement。alayerofprotectivefilmwithdensestructureisformedonthesurfaceofthemoltenalloy,increasingitsbumingtemperature.Furthermore,alloyingcanevidentlyenhancemechanicalproperties.Fi
6、nallyweexpecttoobtainthenew-typeignition-proofmagnesiumalloy,whichhasnotonlytheexcellentignition-proofcharacteristicbutalsoexcellentmechanicalproperties.ThesubjectchoosesmagnesiumalloyZM5whichiswidelyusedastheoriginalalloy.Theeffectsofmischmetal、CaandLiaddit
7、ions,withdifferentmethodsandamount,onthebumingtemperatureofZM5magnesiumalloyareinvestigated.TheeffectsofalloyingelementadditionsonthemechanicalpropertiesofZM5magnesiumalloyarealsoinvestigated.Newmagnesiumalloywithbothexcellentignition—proofpropertyandaccepta
8、blemechanicalpropertiesisobtained。moreover,theignition-proofprincipleisalsoanalyzedpreliminanly.ItisdiscoveredthatCaormischmetaladditionstoZM5alloycanfornlalayerofdense-filmonthesurfaceandheight
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