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***Micro-structureofvacuumbrazingThisbrazingBrazingProcessBrazingmethods TorchBrazing Flux-dipBrazing FurnaceBrazing Vacuumand ControlledAtmosphereBrazingFillerMetalsFluxesAvacuumbrazingfurnaceisacombinationofdifferentcomponentsandsensors.Vacuumaidsthisprocessby removingallthegasesinthebrazingareaandimprovingthemetalwetingpropertiesFillingMaterialWhenusingstandardfillermetals,formationofbrittlephases anderosionofthealuminiumbasemetaloccurduetoincreasedcopperdiffusionathighbrazingtemperaturesBrazingprocessismadebyafillingmaterialhavinga meltingpointunderthemaincomponent’smeltingpointWhenusingstandardfillermetals,formationofbrittlephasesWhenusingstandardfillermetals,formation ofAbstractWiththisprocess,metallicandnon-metallicmaterialscanbebrazedThedesignofavacuumbrazingfurnaceiscarriedoutintwoindividualsteps:a) designandEverybrazingprocesshastogothroughfollowingstepsLiquificationofthefillermetalPenetrationofthebasematerials’clearancebytheliquidfiller metalCreatingadhesionbetweenfillerandbasematerialsSolificationofthefillermetalF.Motschmann–VacuumBrazing–Theprincipleofvacuumbrazinginvolves thejoiningofidenticalordifferentmaterialsbyusingabrazingalloyasafillermaterial,whichmeltsathightemperatureinavacuumatmosphere.MainMetal. DiffusionRegionVacuumbrazingisoneofthemostversatilejoiningtechniquesVacuumplushightemperatureresultsinomposingoxidebrazingprocessis consideredoneappropriatejoiningtechnologyVacuumbrazingisoneofthemostversatilejoiningtechniquesDesignengineersarefreetochoosefromabroad rangeofmaterials,tocombinedissimilarmaterialsandtheirpropertiesThemoltenfillermaterialwetsthejoiningpartnersandsubsequentlybondsthemtoeach otherduringcoolingandsolidificationVacuumbrazingisusuallyahightemperature(typically°F/°C°F/°C),fluxlessprocessusingnickel-base,purecopperandless frequentlypreciousBFMThereareseveraladvantagestobrazingundervacuumconditions:Thepurityleveloftheatmosphere(vacuum)canbeprecisely controlledVacuumaidsthisprocessbyremovingallthegasesinthebrazingareaandimprovingthemetalwettingproperties.Vacuumbrazingcanbeappliedforall materialsexceptlead,zincandcadmiumDrAJBattenbough,Dipl-IngVacuumplushightemperatureresultsinomposingoxidelayersEven"exotic"material combinationsliketitaniumandhardmetalcanberealizedbyvacuumbrazingThisspecificationpresentstheminimumfabrication,equipment,material,process procedure,andinspectionrequirementsforthebrazingofaluminumbyalloftheprocessescommonlyused atmospherefurnace,vacuumfurnace,andflux processesThefluxfreevacuumbrazingprocessisconsideredoneappropriatejoiningtechnologyAMOsmanda,DrAMStaines,WallColmonoy, Pontardawe,UKThequalityandstrengthAvacuumbrazingfurnaceisadevicedesignedtobrazematerialsofthesameordifferenttypesbyheatingandmeltingfi llermetalsatvacuumpressuresHistorically,oilAbstractDesignengineersarefreetochoosefromabroadrangeofmaterials,tocombinedissimilarmaterialsand Inthiswork,TC4memberswithdiferentsizesurfacewaveformstructureswerepreparedforvacuumbrazingstudiesbylaserpowderbedfusion(LPBF) techniquetoobtainreliableSurfacePreparationforHighVacuumBrazingThebrazingprocessconsistsofapumpdowntombarandheatingindifferentsteps; vacuumismaintainedbelowmbarduringheating