tribological properties of nickel-graphite composite against different counterfaces at elevated temperatures

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1、Tribologicalpropertiesofnickel-graphitecompositeagainstdifferentcounterfacesatelevatedtemperaturesSciencePressTrans.NonferrousMet.Soc.China17(2007)s99一s104TransactionsofNonferrousMetalsSocietyofChinaWWW.CSt1.edu.cn/ysxb/Tribologicalpropertiesofnickel—graphitecompositeagainstdifferent

2、counterfacesatelevatedtemperaturesLIJian?liang(李建亮),XIONGDang—sheng(~党生),WANYi(万轶)DepartmentofMaterialsScienceandEngineering,NanjingUniversityofScienceandTechnology,Nanjing210094,ChinaReceived15July2007;accepted10September2007Abstract:Nickel—basedgraphite—containingcompositeswereprep

3、aredbypowdermetallurgymethod.Theeffectofgraphiteadditiononmechanicalpropertiesofnickel—basedalloywasinvestigatedandthetribologicalpropertiesfromroomtemperatureto600℃weretestedbyapin—on—disktribometerwithalumina,siliconnitrideandnickel—basedalloyascounterfaces.Themicrostructurewasanal

4、yzedbyX-raydiffraction(XRD)andscanningelectronmicroscope(SEM)attachedwithenergydispersivespectroscopy(EDS).ThewornsurfacesathightemperaturewereobservedbyopticalmicroscopeandSEM.Theresultsshowthatthetensilestrengthandhardnessofcompositesdecreaseafteraddinggraphite.whilethefrictionandw

5、earpropertiesarealIireprovedbyadding12%(massfraction)graphite.Comparedwiththecounterfaceofaluminaandsiliconnitride.thefrictioncoefficientsandwearratesarelowerwhenthecompositerubsagainstnickel—basedalloycontainingmolybdenumdisulfide.Keywords:high-?temperature;solidlubrication;self-lub

6、ricatingcomposite;Ni-?basedalloy;graphite1IntroductionAttemperatureabove350.C.conventionalliquidlubricantsbegintodegrade.Underthesecircumstances.advancedsolidlubricantsmustbeemployed『l1.Graphitewasacommonlyusedsolidlubricant.Nickel—basedalloysarewidelyusedinthehigh—efficiencyenginedu

7、etotheirexcellenthigh—temperatureperformance[2].Whenthesolidlubricantsarecompoundedwiththenickel—basedalloyself_lubricatin2,thecompositecanbefabricated[3].ZHUetall4】preparedNi3Al/graphitecompositeandfoundthatitsfrictioncoefficientdropstoO.2atroomtemperature.However,thehigh—temperatur

8、efrictionpro