阻燃镁合金研究

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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