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1、SinteringofWC-CopowderwithnanocrystallineWCbysparkplasmasinteringRAREMETALSVo1.2S,No.3.Jun2006,p.246SinteringofWC—CopowderwithnanocrystallineWCbysparkplasmasinteringWANGXingqingn,XIEHngfangn,GUOHailiangn,0.VanderBiest2',andJ.Vleugels'1)SchoolofMaterialsScienceandEngineering,ShanghaiUniversity,Sha
2、nghai200072,China2)MaterialsEngineeringFacultyofEngineering,KatholikekeUniversiteitLeuven,Leuven3000,Belgium(Received2005—06—01)Abstract:A92WC.8Copowdermix~ewiⅡ133nnlWCgrainswaspreparedbystrengtheningballmillingandwasthensinteredbysparkplasmasintering(SPS)at1000-1200.Cfor5—18minunder10-25kN,respe
3、ctively.Movementoftheposi—tionoflowpunchshownshrinkageofthesinteredbodybeganabove800.C.Theshrinkageslowlyroseasthetemperaturerosefrom800to1000.Candthenquicklyroseatabove1000.Candthellgraduallyroseatabove1150.C.Thedensitiesofthesamplesincreasedwithanincreaseinsinteringtemperature,rapidlybelow1100.
4、C,andthengraduallyabove1100.C.WCgrainsgrowgraduallywithincreasingsinteringtemperature.11hepowderwassinteredtonearfulldensityat1100.Cfor5minunder10kN.111ebestresultofthesamplewith275nnlWCgrainsandnoporeswasobtainedat1150.Cunder10kNfor5min.11heresearchfoundthegraphitediehadafunctionofcarbufiz~tion,
5、whichcouldcompensatethesinteredbodyforthelackofcarbon,andhadthenormalmicrostructure.Keywords:nanocrystallinecementedcarbide;sparkplasmasintering;lowtemperaturesintering;sla'engtheningballmilfing1.IntroductionThecementedcarbideismadefromrefractorymetalliccarbidesandbondingmetals.Itisproducedbypowd
6、ermetallurgy,thatis,powderpreparation,compaction,andhightemperaturesintering.Sinter—ingisaprocessofalloyinganddensificationofthemixedpowdersofmetalliccarbidesandbondingmetals.whichisakeytechniquetoaffectmicro-structuresandpropertiesofthecementedcarbide.Sinteringofcementedcarbideistraditionallycar
7、—riedoutinprotectiveatmospherefurnacesorvac—uumfurnacesatatemperatureofliquidformationn1.Heattransmissionfromheretothesinteredcompactsisfromtheoutertotheinnerbyconvec—tion,conduction,andradiation,soitisaveryslowraisein
