Wear characterization of thermal spray welded Ni–Cr–B–Si–RE alloy coatings

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1、journalofmaterialsprocessingtechnology209(2009)1368–1374journalhomepage:www.elsevier.com/locate/jmatprotecWearcharacterizationofthermalsprayweldedNi–Cr–B–Si–REalloycoatingsZhenyuZhanga,b,∗,ZhipingWangb,BunvLiangaaMechanicalEngineeringDepartment,LanzhouPolytechnicalCollege,Lanzhou,Ga

2、nsu730050,PRChinabStateKeyLaboratoryofNewNonferrousMetalMaterials,LanzhouUniversityofTechnology,Lanzhou,Gansu730050,PRChinaarticleinfoabstractArticlehistory:ThepresentcontributionreportsthetribologicalpropertiesofNi–Cr–B–Si–REalloycoatings,Received17July2007thermalsprayweldedontoste

3、elsubstrate.AstudywasconductedthatcharacterizedtheReceivedinrevisedformcriticalnormalloadsandslidingspeedonthewearbehaviorofaNi–Cr–B–Si–REalloy.The17March2008wornsurfacesoftheNi–Cr–B–Si–REalloycoatingswereexaminedwithafieldemissiongunAccepted29March2008scanningelectronmicroscopy(FEGS

4、EM),energydispersivespectroscopy(EDS)andX-rayphotoelectronspectroscopy(XPS).Theresultsshowthatanadheredoxidedebrislayerwasformedonthewornsurfaceinfrictionwhichcontributedtodecreasedwear.WearrateofKeywords:thecoatingsincreasedwiththeload,butdecreasedwiththeslidingspeedintherangeofNi–

5、Cr–B–Si–REalloycoatings0.02–0.08m/s,thenincreasesalittleat0.1m/sslidingspeed.TheaveragefrictioncoefficientThermalsprayweldedisabout0.48,anddecreasedwiththeload,butincreasedwithslidingspeedatfirst,andthenWeartendedtoslightdecrease.WearmechanismisdominatedbyalargeamountofcounterpartWear

6、debrislayermaterialtransferredtothecoating.©2008ElsevierB.V.Allrightsreserved.1.Introductiontureoxidationandcorrosionresistance,anditiswidelyusedinchemicalindustry,petrolindustryandsteelindustry,whereTheincreasinglyextremeconditionsinwhichcomponentsareinstancesofslidingorerosionbetw

7、eenoneormorebodiesarerequiredtoworkhaveledtotheuseofthermalspraycoat-commonlyencountered(Wangetal.,2001;LuandXue,1998;ingsinalotofindustrialapplications.SpecialattentionhasKimetal.,2003).TheNi–Cr–B–Si–REalloy,subjectofthisstudy,beenpaidinFe-basedandNi-basedalloyssincetheyprovidepres

8、entsahighbondingstr