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1、Wear255(2003)883892AwearmapofbearingsteellubricatedbysilverfilmsSeungHoYanga,HosungKonga,∗,Eui-SungYoona,DaeEunKimbaTribologyResearchCenter,KoreaInstituteofScienceandTechnology,39-1Hwawolkok-dongSungbuk-ku,Seoul,SouthKoreabDepartmentofMechanicalEngineering,Yo
2、nseiUniversity,Seoul,SouthKoreaAbstractWearmapofbearingsteellubricatedbysilverfilmhasbeenconstructedtodelineatetheweartransitionbehaviorwiththechangeinoperatingconditions.Experimentswereperformedindryslidingconditionsusingtwotypesofball-on-disktypetestrigsund
3、erthecontactpressureof1001000MPaandtheslidingspeedof201000mm/sinambientair.Forthesilvercoating,anultrathinIBADsilverbondlayerwasfirstlydepositedonAISI52100steelsurfacesandthenarelativelysoftsilverfilmwasdepositedbyathermalevaporationmethodontothefirstlayer.This
4、functionallygradientfilmshowedagreatimprovementinthelife,mainlyowingtothebetterbondstrength.Inordertobuildupageneralframeworkonthetribologicalbehaviorofthefunctionallygradientsilverfilms,alltestdatawereplottedonamapwhoseaxesarecontactpressureandslidingspeed.As
5、aresult,threemainregimeswereclearlyidentified:(i)elastic/plasticdeformationofsilvercoatingwithoutfailure,(ii)mildwearregimeafterinitialfailureofsilvercoatingand(iii)severewearregime.Inthemildwearregime,thecontactsurfaceswerecoveredwithtransferlayersofagglomer
6、atedwearparticles.Thetransferlayeractedasaprotectivelayerandresultedinlowfrictionafterinitialfailureofthecoating.Theformationoftransferlayerwassuppressedbyseveraldestructiveactions,whentheslidingspeedwashigh.And,aboveacriticalslidingspeed,notransferlayerwasa
7、bletoform.Inthediscussion,anempiricalmodelthatcouldexplaintheexistenceofcriticalslidingspeedwasproposed.©2003ElsevierScienceB.V.Allrightsreserved.Keywords:Wearmap;Transferlayer;Functionallygradientfilm;Criticalvelocity1.Introductionaftertheinitialfailureofcoa
8、tingoccurred.LotsofworkhavefocusedonthegenerationmechanismoftransferlayerSoftmetalliccoatinghasbeenfocusedasagoodsolid[49]andtheroleofthetransferlayeronfrictionandwearlubricatingfilmforthespacebe
