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1、ComparisonofTEGOSTAR738withASTMB23-2alloy(BasedonUSmeasuringtechniques)Thetypicalstress-straindiagramofknownbearingmetalsiscurvedoveritswholelength,whereasthestress-strainbehaviourofTEGOSTAR738presentsamarkedlinearrange,andtheJ.A.E.L.pointliesjustbelow25%ultimatestrengthincom-pression,seeFig.1
2、.ThatmeansthatTEGOSTAR738,contrarytoallotherbearingmetals,possessesalargeelasticrange,approx.6timeslargerthanthatofthealloyASTMB23-2,takingthe100°CJ.A.E.L.valuesasreference.Thisresultsinaconsiderablereductionofplasticdeformationunderhighloadandhightemperature.Fig.2showsthesecreepcharacteristic
3、sofTEGOSTAR738ascomparedwithASTMB23-2alloy.ThecreepintensityofTEGOSTAR738is8timeslower.Fig.3showsthehigherextendedyieldpointasafunctionofthereducedTEGOSTARlayerthicknessappliedonthesteelsupportingbody.Ingeneral,allbearingmaterialsshowthiscompositeeffect,butitcanonlybeutilizedifthematerialposse
4、ssesreducedcreepcharacteristics,likeTEGOSTAR738.ASTMB23doesnotgiveanydataofthematerialpropertiesregardingimpact-bearingcapacity.WetestedthispropertyandfoundthatforTEGOSTAR738andASTMB23-2alloy,itliesonanequallyhighlevel.AdvantagesofTEGOSTAR738asagainstASTMB23-2alloy:•Morethandoublecompressivest
5、rength•Greatlyreducedcreepintensity•Longerservicelifeofthefrictionbearings•Higherutilizablecompressivestrengthduetoreducedlayerthicknessofthebearingmetal•Highimpact-bearingcapacity•Suitabilityforallapplicationranges•Environmentallycompatiblealloywithoutlead,cadmium,nickelandarsenicFig.1:Chemic
6、alcompositionandphysicalpropertiesofTEGOSTAR738andASTMB23-2alloyJohnson`sTemp.ofUltimateStrengthProperSpecifiedNominalCompositionApparentElasticBrinellMeltingCompleteYieldPoint,psiinCompression,PouringofAlloys,percentLimit,psiHardnessPointLique-psiTemp.(J.A.E.L.)factionAlloyGradeSpecificGravit
7、yTinAntimonyCopperZincSilver20C100C20C100C20C100C20C100CDegFDegCDegFDegCDegFDegCTEGOSTAR81,312,06,00,60,17,3512660702011840653019300103002614458235680360970540ASTMB23-289,007,53,57,39610030003350110014900870024,512466241669354795424Fig.
