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Au20Sn箔材焊料及其应用.docx

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Au20Sn箔材焊料及其应用 1.Introduction Au20Snfoilisacompositematerialthatconsistsofgold(Au)andtin(Sn).Ithasexcellentelectricalconductivity,highmeltingpoint,goodcorrosionresistance,andiswidelyusedintheelectronicsandaerospaceindustries.Inordertofabricateelectronicdevicesandaerospacecomponents,itisnecessarytojointheAu20Snfoiltoothermaterials.Therefore,weldingprocessesareessential.ThispaperwilldiscussthepropertiesofAu20Snfoil,weldingmethods,andapplicationsofAu20Snfoilintheelectronicsandaerospaceindustries. 2.PropertiesofAu20SnFoil Au20Snfoilisacompositematerialthathasseveraluniqueproperties.Firstly,Au20Snfoilhashighthermalconductivity,approximately300W/mk,whichenablesquickheattransfer.Secondly,ithasahighmeltingpoint,approximately280°C,whichmakesitresistanttohightemperatures.Thirdly,Au20Snfoilhasgoodworkability,whichallowsittobeeasilymoldedintodifferentshapesandsizes.Fourthly,ithasexcellentelectricalconductivity,whichmakesitsuitableforuseinelectronicdevices.Lastly,ithasgoodcorrosionresistance,whichpreventsitfromrustingoroxidizing. 3.WeldingMethodsofAu20SnFoil WeldingmethodsdependontheapplicationandrequiredperformanceoftheAu20Snfoil.Thereareseveralweldingmethodscommonlyusedintheindustry,includingresistancewelding,laserwelding,andadhesivewelding. 3.1ResistanceWelding Resistancewelding,alsoknownasspotwelding,isacommonmethodusedintheelectronicsindustrytoattachAu20Snfoiltoothermaterials.Thismethoduseselectricalcurrenttocreateheatandjointhetwomaterials.TheheatgeneratedbytheelectricalcurrentmeltstheAu20Snfoilandcausesittofusetotheothermaterial. 3.2LaserWelding Laserweldingisaweldingprocessthatusesahigh-energylaserbeamtomelttheAu20Snfoilandfuseittoanothermaterial.Thismethodiscommonlyusedintheaerospaceindustrybecauseofitsprecisionandabilitytoweldverysmallparts. 3.3AdhesiveWelding AdhesiveweldingisamethodthatusesabondingagenttoattachtheAu20Snfoiltoanothermaterial.Thismethodiscommonlyusedinelectronicdevicesbecauseitallowsformoreflexibilityindesign,anditdoesnotrequirehigh-temperaturewelding.