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1、Designation:B702?93(Reapproved2015)StardSpecificationfCopperTungstenElectricalContactMaterial1ThisstardisissuedunderthefixeddesignationB702thenumberimmediatelyfollowingthedesignationindicatestheyearofiginaladoptioninthec

2、aseofrevisiontheyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperepsilon()indicatesaneditialchangesincethelastrevisionreapproval.1.Scope1.1Thisspecificationcoverselectricalcontactcomponentsma

3、defromcoppertungstenbypowdermetallurgicalprocedures.1.2Thisspecificationcoverscompositionswithinthecoppertungstensystemnmallyspecifiedbyusersofcontacts.1.3Thevaluesstatedininchpoundunitsaretoberegardedasstard.Nootherunit

4、sofmeasurementareincludedinthisstard.1.4Thisstarddoesnotpurpttoaddressallofthesafetyconcernsifanyassociatedwithitsuse.Itistheresponsibilityoftheuserofthisstardtobecomefamiliarwithallhazardsincludingthoseidentifiedintheap

5、propriateDataSafetySheet(SDS)fthisproductmaterialasprovidedbythemanufacturertoestablishappropriatesafetyhealthpracticesdeterminetheapplicabilityofregulatylimitationspritouse.2.ReferencedDocuments2.1ASTMStards:2B328TestMe

6、thodfDensityOilContentInterconnectedPosityofSinteredMetalStructuralPartsOilImpregnatedBearings(Withdrawn2009)33.SignificanceUse3.1Proprietarymethodsfmanufactureofthesematerialsvarysignificantlyamongsuppliersthesemethodsi

7、nfluencesuchpropertiesasarcerosioncontactresistancetendencytoweldinservice.Sincetheperfmanceofcontactsinadevicedependsonnumerousfactsoutsidethecontactitself(openingspeedclosingspeedcontactpressurecontactbounceenvironment

8、alvariationsassemblytechniquevariationsetc.)thisspecificationcannotensureperfmancecontrolintheapplication.Aspartofthequalificationoninitialsamplesitisrecommendedthattheuserfunctionallyelectricallytestthematerialsfalldevi

9、cesapplicabletothematerial’suse.Thisspecificationwillprovideameansfthecontactmanufacturercontactusertoreachagreementonthedetailsofmaterialtobesuppliedfaspecifiedusereasonableassurancethatfuturelotswillbesimilarinproperti

10、esmicrostructuretotheinitialtestsamplecontactssupplied.4.deringInfmation4.1dersfthismaterialunderthisspecificationshallincludethefollowinginfmation:4.1.1Dimensions(seeSection8)4.1.2Chemicalcomposition(seereferencetablesi

11、nRelatedMaterialaspossibleguideline)4.1.3Physicalproperties(seeSection6referencetablesasguideline)4.1.4Certification(seeSection11)4.1.5Otherfeaturesasagreeduponbetweenthevendtheuser.5.ChemicalRequirements5.1Thematerialsh

12、allconfmtocompositionlimitsasagreeduponbetweenthemanufacturertheuser.5.2ThechemicalanalysisshallbemadeinaccdancewiththemethodsprescribedinthenewesteditionofAnnualBookofASTMStardsbyanyotherapprovedmethodagreeduponbetweent

13、hemanufacturerthepurchaser.6.OtherProperties6.1Themanufacturerthepurchasershallagreeonqualificationtestsfdeterminationofphysicalproperties.6.2Thetestsshallbeperfmedonproductionpartswhereverpracticalapplicable.(Smallsizec

14、ontactsdonotlendthemselvestoaccurateconductivitymeasurement.)6.3Thetestsshallbedeterminedafterconsiderationofthefunctionofthepart.6.4ThetypicalpropertiesoffivemostcommontypesofcoppertungstencontactsaregiveninAppendixX1.1

15、ThisspecificationisunderthejurisdictionofASTMCommitteeB02onNonferrousMetalsAlloysisthedirectresponsibilityofSubcommitteeB02.05onPreciousMetalsElectricalContactMaterials.CurrenteditionapprovedOct.12015.PublishedOctober201

16、5.iginallyapprovedin1982.Lastpreviouseditionapprovedin2010asB702–93(2010).DOI:10.1520B070293R15.2FreferencedASTMstardsvisittheASTMwebsitewww.astm.gcontactASTMCustomerServiceat.FAnnualBookofASTMStardsvolumeinfmationrefert

17、othestard’sDocumentSummarypageontheASTMwebsite.3Thelastapprovedversionofthishisticalstardisreferencedonwww.astm.g.Copyright?ASTMInternational100BarrHarbDrivePOBoxC700WestConshohockenPA194282959.UnitedStates1ASTMInternati

18、onaltakesnopositionrespectingthevalidityofanypatentrightsassertedinconnectionwithanyitemmentionedinthisstard.Usersofthisstardareexpresslyadvisedthatdeterminationofthevalidityofanysuchpatentrightstheriskofinfringementofsu

19、chrightsareentirelytheirownresponsibility.Thisstardissubjecttorevisionatanytimebytheresponsibletechnicalcommitteemustbereviewedeveryfiveyearsifnotrevisedeitherreapprovedwithdrawn.Yourcommentsareinvitedeitherfrevisionofth

20、isstardfadditionalstardsshouldbeaddressedtoASTMInternationalHeadquarters.Yourcommentswillreceivecarefulconsiderationatameetingoftheresponsibletechnicalcommitteewhichyoumayattend.Ifyoufeelthatyourcommentshavenotreceivedaf

21、airhearingyoushouldmakeyourviewsknowntotheASTMCommitteeonStardsattheaddressshownbelow.ThisstardiscopyrightedbyASTMInternational100BarrHarbDrivePOBoxC700WestConshohockenPA194282959UnitedStates.Individualreprints(singlemul

22、tiplecopies)ofthisstardmaybeobtainedbycontactingASTMattheaboveaddressat6108329585(phone)6108329555(fax)(email)throughtheASTMwebsite(www.astm.g).PermissionrightstophotocopythestardmayalsobesecuredfromtheCopyrightClearance

23、Center222RosewoodDriveDanversMA01923Tel:(978)6462600TABLEX1.1ChemicalRequirementsAClassAClassBClassCClassDClassECopper%48–5238–4228–3223–2718–22Tungsten%balancebalancebalancebalancebalanceAdditives(Individualtotal)max%1.

24、001.001.001.001.00PhysicalPropertiesBClassAClassBClassCClassDClassEHardnessRockwellB69–8377–9085–9889–10294–106DensityMgm3at96%theetical11.712.713.714.315.0ElectricalconductivityC%IACS56–6449–5744–5241–4838–45Electricalc

25、onductivityD%IACS38–5634–4929–4327–4125–37Note—Hardnessdensityvaluescoverbothtypes.PhysicalPropertiesEClassAClassBClassCClassDClassETensileStrengthksiMPa50–60344–41355–65379–44875–85516–58585–95585–65490–100620–689Modulu

26、sofRuptureksiMPa75–85517–586110–120758–827130–140896–965140–150965–1034150–1601034–1103CoefficientofExpansionin.in.FmmK7.210?61310?66.610?611.910?65.710?610.310?65.310?69.510?64.910?68.810?6AAnalysisisregularlymadeftheel

27、ementsfwhichspecificlimitsarelisted.Ifhoweverthepresenceof“other”elementsissuspectedindicatedinthecourseofroutineanalysisfurtheranalysisshallbemadetodeterminethatthetotalofthese“other”elementsthelistedimpuritiesarenotine

28、xcessofthetotalimpuritieslimit.BThesedatadonotconstituteapartofthespecifications.Theyindicatetothepurchaserthepropertiesthatmaybeexpectedfromagivenparticlesizeofpowder.Thevalueswillvarytosomedegreewiththesizeofpartconfig

29、urationofpartcompositionmicrostructure.Certainspecificapplicationsmayrequiremodificationofthesebasicmaterials.Insuchcasethepropertiesrequiredaredeterminedbyagreementbetweenthepurchaserthesupplier.CTypicalvaluesfinfiltrat

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