基于綠色理論與方法的Cu-Al接頭設計研究.pdf

1、蘭州理工大學碩士學位論文基于綠色理論與方法的CuAl接頭設計研究姓名：劉孝麗申請學位級別：碩士專業(yè)：材料加工工程指導教師：夏天東20120603基于綠色設計理論與方法的cu—Al接頭設計研究寡I—Ill—一一一——l舅量皇曼曼曼曼量AbstractDuetotheincreaseinpriceofcopper，therehasbeenatrendofemployingaluminumpipeinsteadofcopperpipeinre

2、frigerationindustry，becauseofitssimilarthermalconductivityatareducedmarketpriceandlowerspecificdensity碭ecopperaluminumpipehasbeenwidelyusedintherefrigerationindustryTheconnectionprocessofdissimilarmaterialssuchasaluminum

3、andcopperusesthebrazingmethodtoformapermanentjointForthisreasonalargenumberofmechanicalandelectricalproductsofcopperandaluminumpartsbrazedjointsWasabandoned，causedaseriouswasteofresourcesRegardthis，remanufacturingofCuAIb

4、razedcompositeonthebasisof4R(Reduce，Reuse，Remanufacture，Recycle)isreallyurgentcurrentlyHowever，thethermalseparatingmethodandelectrolyticseparatingmethodcouldonlyseparatesCu／A1buttjointswithAl12Sifillersalloys，itcannotsep

5、aratesCu／AllapjointsForthisreasonitisintendedtointroducethegreenwelding，whichwillbeintegratedintotheproductsentirelifecycleofprocessgradually，F(xiàn)romthedesigndevelopment，manufacturingtomaintenance，recycling，everystageGreend

6、esignisanimportantpartinmanufacturingelectronicproductsInthiswork，the3衄，5衄，7mlnand10衄lablengthoftheCuA1brazedjointshadbeenresearchedInthisstudyintroducedthegreenwelding，whichwillimprovetherecycleabilityoftheCuAIbrazedjoi

7、ntsfromtechnologicaldesignSOurCeAndtoCuA1brazedjointslifecycleofenergydissipationevaluated，thusforCuAIbrazedjointsdesignprovidethereasonableandfeasibleenergyanalysismethodandtheapplicationmethodThemacrostructureandleakti

8、ghtnessandbondings仃engthoftheinterfaceofCuAlbrazedjointswereanalyzedrespectivelyItisseenfromthemacrostmcturepictures，When5咖lablength(X)WasdesignedbondinginterfacequalityrevealedtheperfectTheShearstrengthtestShowsthatthes

9、hearstrengthincreasedatfirst、7I，inlincreasinglablengthfrom3衄to7millandthendecreasedasthelablengthmovedbeyond7mmItshowedthattheshearstrengthofthe7mmjointswasthebestunderthes鋤∞condition，themaximumshearstrengthofthe7mmjoint

10、sCanreach7564MP&Itisevidentthatintheinterfacialleaktightnessofjointstest，t11el印jointsdidnotleakfinallyevenafterjointsweresubjectedtothermalcycles，e文c印t也e1aplengthofCuAIbrazedjointsis3mmTherefore，lablengthfrom5衄to10衄，this

11、rangeofthejointslablengthCallsettleforindustrialrequirementFinallytheadaptedlaplengthparameterswithinthescopeofthisstudyweredeterminedaccordingtoacriterionoftherecycleexperimentItisconcludedfromthetheoreticalandexperimen

12、talresultsthatthelablengthfor5mmofCuAlbrazedjoints、析tllA1—12SifillersalloyscomplieswiththegreenweldingdesignconceptCuAlbrazedjointslifecycleofenergydissipationevaluatedindicatethatthehigllweldingmethodandreasonablelaplen