1.-ASTM-D2739-导电胶的体积电阻率的标准试验方法

Designation:D2739−97(Reapproved2010)StandardTestMethodforVolumeResistivityofConductiveAdhesives1ThisstandardisissuedunderthefixeddesignationD2739;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofthevolumeresistivityofresin-basedconductiveadhesivesinthecuredcondition.Thetestismadeonathinadhesivelayeraspreparedinabondedspecimen.Thistestmethodisusedforconductiveadhesivesthatarecuredeitheratroomtemperatureoratelevatedtemperatures.1.2ThevaluesstatedineitherSIorotherunitsshallberegardedseparatelyasstandard.SIequivalentstoscrewthreadsareshowninthefigures.1.3Thisstandarddoesnotpurporttoaddressthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D618PracticeforConditioningPlasticsforTestingD907TerminologyofAdhesives2.2FederalSpecification:QQ-B-626Composition2232.3ASTMAdjuncts:AssemblyJig43.Terminology3.1Definitions:3.1.1ManytermsinthistestmethodaredefinedinTermi-nologyD907.3.1.2conductivity,n—theratioofthecurrentdensitycarriedthroughaspecimentothepotentialgradientparallelingthecurrent.Thisisnumericallyequaltotheconductancebetweenoppositefacesofaunitcubeofliquid.Itisthereciprocalofresistivity.D2864,D273.1.3resistivity,volume,n—theratiooftheelectricpotentialgradienttothecurrentdensitywhenthegradientisparalleltothecurrentinthematerial.D1566,D114.SummaryofTestMethod4.1Thevolumeresistivityofadhesivelayerscuredbetweenmetaladherendsismeasuredonaresistancebridge.Tensileadhesionplugs(Fig.1)5aredescribedinthistestmethod.Anyothertestspecimensandmaterialscanbeusedaslongassimilarprecautions(seeSection7)areobservedregardingpreparationandtolerances.5.SignificanceandUse5.1Accuratemeasurementofthevolumeresistivityofconductiveadhesivesisimportant,particularlywithrespecttoapplicationsinelectronicpackagingtechniques.Thismethodmeasurestheresistanceofconductiveadhesivesusedinthinfilmsaspartofabondedassembly.Thisdoesnotimplythatthemeasuredresultsareapplicabletodifferentconfigurationswithdifferentmetals.Thismethodmaybeusedforacceptancetestingandforscreeningmaterials.6.Apparatus6.1Kelvin(Resistance)Bridge,calibratedto1%accuracy.66.2Withtheagreementoftheinterestedparties,anymetaltensileadhesionplugs(Fig.1)canbeusedtopreparethetensileadhesionspecimens.NOTE1—Differentmetalswillinherentlyprovidedifferentresistancevalues.Themeasuredresistanceisdependentonresistanceattheadhesive-adherendinterfaceduetometaloxideformation.Theextentofoxideformationvarieswithlocalityandlaboratoryconditions.Brass,conformingtoFederalSpecificationQQ-B-626Composition22,isaconvenientmetal.However,inordertominimizeoxideformation,1ThistestmethodisunderthejurisdictionofASTMCommitteeD14onAdhesivesandisthedirectresponsibilityofSubcommitteeD14.80onMetalBondingAdhesives.CurrenteditionapprovedOct.1,2010.PublishedOctober2010.Originallyapprovedin1968.Lastpreviouseditionapprovedin2004asD2739–97(2004).DOI:10.1520/D2739-97R10.2ForreferencedASTMstandards,visittheASTMwebsite,@astm.org.ForAnnualBookofASTMStandardsvolumeinformation,refertothestandard’sDocumentSummarypageontheASTMwebsite.3AvailablefromStandardizationDocumentsOrderDesk,DODSSP,Bldg.4,SectionD,700RobbinsAve.,Philadelphia,PA19111-5098,—No.192,HermanH.Smith,Inc.,orequivalent.6Satisfactoryresistancebridgesaremadeby:LeadsandNorthupCo.BridgeCatalogNo.4306,MinneapolisHoneywellDivisionCatalogNo.1622,andBiddleInstrumentsCatalogNo.603282.Copyright©ASTMInternational,100BarrHarborDrive,POBoxC700,WestConshohocken,PA19428-2959.UnitedStates1CopyrightASTMInternationalProvidedbyIHSunderlicensewithASTMLicensee=HongKongPolytechnicUniversity/9976803100NotforResale,01/04/201620:07:29MSTNoreproductionornetworkingpermittedwithoutlicensefromIHS--```,,`,``,,`,,`,,,``,```,,,,,`-`-`,,`,,`,`,,`---especiallywheremeasurementsarecritical,asinrefereemeasurements,itisrecommendedthatthemetalplugsbeplatedwitheithergoldorsilvertoathicknessofnotlessthan1µm(0.000040in.).Anysizeplugupto30mmindiametercanbeusedwiththeaidofanalignmentjig.47.TestSpecimen7.1Thoroughlyabradethefaceofthespecimentobebonded(otherthangold-orsilver-plated)withcrocuscloth4527orequivalent,andwipewithcleansolvent,suchasreagent-grademethylethylketone,immediatelypriortobond-ing.7.2Mixtheadhesivetobetestedinaccordancewiththemanufacturer’sinstructions,takingcaretomixinaslittleairaspossible.7.3Coatsufficientadhesiveonthesurfacetobebondedtoensureuniformsqueeze-outaroundtheedgeofthebondedarea.Removeexcessadhesive,controllingthebondthicknessassho