铜2f铝钎焊用锌基钎料的研制与其炉中钎焊工艺分析-(6221)

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1、西安理工大学硕士学位论文obtainedinZn-richregionthanAl-richregion.AcontinuousthinCu-Alintermetalliccompound(IMC)layerwithVickersmicro-hardnessashighas557HVformedattheweld/copperinterface,wherecrackwaseasytooccurandspread.Theaveragetensilestrengthofthealuminum/copperbrazedbuttjointis50.62MPa.3

2、.Themainconclusionsofthefurnacebrazingexperimentinvacuumfurnacewerepresentedasfollows.AcontinuousthinCu-AlIMClayerformedattheweld/copperinterfaceinbuttjoint,andthehighestVickersmicro-hardnessliedinthisarea.IMClayerwaseasytoappearandspreadcrack,resultinginfracturedonthesolderingse

3、amforallthebuttjoints.Fractureofbuttjointspresentedtobecleavagebrittlefractureandsmallscaledeformation,gravitysegregationphenomenonwasnotobserved.Thetensilestrengthofbuttjointswas53.4MPainvacuum,whichwashigherthanthatinprotectiveatmosphere.AcomplexIMClayersconsistedofZn-Al-Cu、Zn-

4、CuandCu-AlformedbetweentheCusideandweldseam，buttheCu-AlIMCwasslimmestandnotcontinuous.Inthiscase,fractureoccurredontheAlbasemetal,meaningabetterbondingstrength.Comparedtobuttjoint,lapjointshadthelowerVickersmicro-hardness(381HV).Keywords:Zinc-basefillermetal;Furnacesoldering;Micr

5、ostructure;Spreadability;Mechanicalproperties;IV万方数据目录目录摘要......................................................................................................错误!未定义书签。Abstract................................................................................................错误!未定义书

6、签。1绪论...................................................................................................................................11.1铝铜连接的应用与困难........................................................................................11.2铜铝材料连接方式..............................

7、..................................................................21.2.1机械连接现状..............................................................................................21.2.2熔化焊连接现状..........................................................................................31.2.

8、3压焊连接现状.................................