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1、MaterialsScienceandEngineeringA430(2006)113119EffectsoflowercobaltbinderconcentrationsinsinteringoftungstencarbideTaoLia,b,QingfaLib,J.Y.H.Fuha,∗,PohChingYua,b,C.C.WucaDepartmentofMechanicalEngineering,NationalUniversityofSingapore,9EngineeringDrive1,Singapore117576,SingaporebSingaporeIn
2、stituteofManufacturingTechnology(SIMTech),71NanyangDrive,Singapore639798,SingaporecDepartmentofMechanicalEngineering,SouthernTaiwanUniversityofTechnology,Tainan,TaiwanReceived1March2006;receivedinrevisedform25April2006;accepted23May2006AbstractCementedtungstencarbideshavereceivedmuchatte
3、ntionbecauseoftheirsuperiorcharacteristics.Traditionalcementedtungstencarbidesusuallycontain330wt%binderphase.Inthispaper,WCwithlowCoconcentrationlessthan3wt%isstudiedusingtraditionalpowdermetallurgy.ThebinderphasehastremendouseffectonsinterabilityofWC.Highsinterabilityandhighhardnesscan
4、beachievedfortheWC(0.7m)with0.5wt%Co.Abnormalgraingrowth(AGG)isoftenobservedinsinteringWCwithsmallamountofCo.ItseemsthatAGGisaffectedbytheconcentrationofCoandarangeofCoconcentrationsmayexistforthelargeamountofAGG.Tocontrolthegrainsize,VCisaddedtoinhibitthegraingrowthofWC.Itisobservedtha
5、tthehardnessisaffectedbytheamountofadditionofVC.ControllingtheratioofC/WlessthanunityatlowCoconcentrationswillresultintheproductionofW2Cphase.ThehardnessofWCCoisaffectedbytheamountofW2CphaseinthesampleandW2Cisstableduringthenormalcoolingprocess.©2006ElsevierB.V.Allrightsreserved.Keywords
6、:Cementedtungstencarbide;Hardnesstest;Abnormalgraingrowth;W2Cphase1.Introductionandfracturetoughness.Afiner-grainedmicrostructure,espe-ciallybelowsubmicrometer,withahomogeneousgrainsizeTungstencarbidehaslongbeenwellknownforitsexcep-distributiongivesanincreasedhardness,toughnessandabra-tio
7、nalhardnessandwear/erosionresistancebutpoortough-sionresistance.Recently,inordertoapplycementedcarbidesness.Matricesofductilemetals,suchascobalt,nickel,greatlytocorrosiveenvironment,binderlesscementedcarbides,whichimproveitstoughness.Socementedcarbide(usuallyWCCo),consist
