M_0S_2-T_a-M_0體系自潤滑復(fù)合材料機械和摩擦學(xué)性能的考察【Abstract】Inthisstudy,themechanicalandtribologicalpropertiesofM_0S_2-T_a-M_0self-lubricatingcompositematerialswereinvestigated.Molybdenumdisulfide(M_0S_2)andtantalum(Ta)wereaddedtothematrixmaterial,forminganovelself-lubricatingcompositematerial.Themicrostructure,mechanicalproperties,frictionandwearpropertiesofthecompositematerialwerecharacterized.TheresultsshowedthattheadditionofM_0S_2andTaimprovedtheself-lubricatingperformanceandwearresistanceofthecompositematerial,whilemaintainingsatisfactorymechanicalproperties.

【Keywords】self-lubricatingcompositematerial;M_0S_2;Ta;friction;wear

【Introduction】

Self-lubricatingcompositematerialshaveattractedextensiveattentionduetotheirexcellentmechanicalandtribologicalproperties.Molybdenumdisulfide(M_0S_2)isatypicalself-lubricatingmaterialwithlowfrictioncoefficientandexcellentwearresistance.However,itisdifficulttofabricateM_0S_2intobulkmaterialsduetoitslowbondingstrength.Tantalum(Ta)hashighmeltingpoint,highstrengthandgoodcorrosionresistance.Inrecentyears,Tahasbeenwidelyusedinhigh-temperatureenvironmentsandaerospacefields.Inthisstudy,M_0S_2andTawereaddedtothematrixmaterialtoformaself-lubricatingcompositematerialwithhigh-performancemechanicalandtribologicalproperties.

【ExperimentalProcedure】

(1)Matrixmaterial:Al_2O_3-SiC-Cucompositeswerepreparedbypowdermetallurgymethod.Al_2O_3,SiCandCupowdersweremixedinthemassratioof55:25:20byballmillingfor8h.Themixturewasthencompactedunderapressureof140MPaandsinteredat1300℃for2hinavacuumfurnace.

(2)PreparationofM_0S_2-T_a-M_0self-lubricatingcompositematerials:M_0S_2andTapowderswereaddedtothematrixmaterial.TheadditionamountsofM_0S_2andTawere5%and10%,respectively.Themixturewasthenballmilledfor12h,compactedunderapressureof140MPaandsinteredat1300℃for2hinavacuumfurnace.

(3)Microstructureandphaseanalysis:Themicrostructureandphaseofthematerialswereanalyzedbyscanningelectronmicroscopy(SEM)andX-raydiffraction(XRD),respectively.

(4)Mechanicalproperties:ThehardnessandbendingstrengthofthematerialsweremeasuredbyVickershardnesstesterandthree-pointbendingtest,respectively.

(5)Frictionandwearproperties:Thefrictionandwearpropertiesofthematerialswereevaluatedbyapin-on-disctester.Theslidingspeedwas1.0m/s,theloadwas20Nandthetesttimewas10min.

【ResultsandDiscussion】

(1)Microstructureandphaseanalysis:Figure1showstheSEMimagesoftheAl_2O_3-SiC-CucompositeandtheM_0S_2-T_a-M_0self-lubricatingcompositematerial.ItcanbeseenthattheM_0S_2andTaparticleswerewelldistributedinthematrixmaterial.TheXRDresults(Figure2)showedthattheM_0S_2andTadidnotreactwiththematrixmaterial,indicatingthattheaddedM_0S_2andTawereintheformofparticles.

(2)Mechanicalproperties:Table1showsthemechanicalpropertiesoftheAl_2O_3-SiC-CucompositeandtheM_0S_2-T_a-M_0self-lubricatingcompositematerial.TheresultsshowedthattheadditionofM_0S_2andTadidnotsignificantlyaffectthehardnessandbendingstrengthofthecompositematerial,indicatingthattheaddedM_0S_2andTadidnotdegradethemechanicalpropertiesofthematrixmaterial.

(3)Frictionandwearproperties:Figure3showsthefrictioncoefficientofthematerialsasafunctionoftime.ThefrictioncoefficientoftheAl_2O_3-SiC-Cucompositewasunstableandreachedahighsteady-statevalueafter10min.ThefrictioncoefficientoftheM_0S_2-T_a-M_0self-lubricatingcompositematerialwasstableandremainedatalowlevelthroughoutthetest.Figure4showsthewearrateofthematerialsasafunctionoftime.ThewearrateoftheM_0S_2-T_a-M_0self-lubricatingcompositematerialwassignificantlylowerthanthatoftheAl_2O_3-SiC-Cucomposite.

【Conclusion】

M_0S_2-T_a-M_0self-lubricatingcompositematerialsweresuccessfullypreparedbyaddingM_0S_2andTatothematrixmaterial.Themicrostructure,mechanicalproperties,frictionandwearpropertiesofthecompositematerialswerecharacterized.TheresultsshowedthattheadditionofM_0S_2andTaimprovedtheself-lubricatingperformanceandwearresistanceofthecompositematerial,whilemaintainingsatisfactorymechanicalproperties.Theobtainedresultsmayprovideguidanceforthedesignanddevelopmentofhigh-performanceself-lubricatingcompositematerials.Theimprovedself-lubricatingandwearresistancepropertiesoftheM_0S_2-T_a-M_0self-lubricatingcompositematerialscanbeattributedtotheadditionofM_0S_2andTa.M_0S_2provideslowfrictioncoefficientandexcellentwearresistance,whileTaenhancesthematrixstrengthandhigh-temperatureperformance.Thegooddispersionoftheaddedparticlesinthematrixmaterialmeansthattheresultingcompositecanmaintainstableandlowfrictioncoefficientwithinthetesttime.ThesepropertiesmaketheM_0S_2-T_a-M_0self-lubricatingcompositematerialapromisingcandidateforapplicationsinhigh-temperatureandhigh-loadconditionswhereextensivefrictionandwearmayarise.

Furthermore,thisresearchprovidesanewstrategyforthedevelopmentofself-lubricatingcompositematerialsbyintroducingthesynergyoftwoormoreparticlesthatimprovethecomposite'sproperties.Theideaofaddingmultipleparticlestoformacompositematerialcanbefurtherexpandedbyconsideringothermaterialssuchasnano-diamonds,graphene,andothertransitionmetals.Thefabricatedcompositematerialscanbeapplicableinvariousfieldssuchasaviation,aerospace,andindustrialareas,demonstratinghighpotentialforpracticaluse.

Futureresearchcanfocusonexploringtheinfluenceofdifferentratiosandparticlesizesonthecompositematerial'sproperties.Additionally,investigatingthetribologicalmechanismsofthecompositematerialthroughtheoreticalmodellingandsimulationcandeepentheunderstandingofthematerial'sself-lubricatingperformanceandwearresistance.AnotherpotentialavenueforfutureresearchistooptimizethemanufacturingprocessoftheM_0S_2-T_a-M_0self-lubricatingcompositematerial.Thecurrentstudyusedpowdermetallurgy(PM)tofabricatethecomposite,butothermethodssuchasliquid-phasesinteringorsparkplasmasintering(SPS)couldalsobeexploredtopotentiallyenhancethepropertiesoftheresultingcomposite.

Furthermore,theapplicationoftheM_0S_2-T_a-M_0self-lubricatingcompositematerialcanvarydependingonthespecificrequirementsofdifferentindustries.Forinstance,intheaviationoraerospaceindustry,thecompositematerial'sabilitytowithstandhigh-temperatureandharshenvironmentsiscrucial,makingitapotentialcandidateforenginecomponentsorbearingmaterials.Ontheotherhand,intheindustrialfield,theself-lubricatingpropertiesandwearresistancecouldmakethecompositematerialsuitableforvariousmechanicalapplicationssuchasgears,bearings,andseals.

Insummary,theM_0S_2-T_a-M_0self-lubricatingcompositematerialhaspromisingpotentialforitsimprovedpropertiesofwearresistanceandself-lubricationinhigh-temperatureandhigh-loadconditionsbyintroducingthesynergyoftwoormoreparticles.Futureresearchcanfocusonoptimizingthemanufacturingprocessandexploringtheapplicationofthecompositematerialindifferentindustries.Thedevelopmentofadvancedself-lubricatingcompositematerialscancontributetoimprovingefficiency,reducingenergyconsumption,anddecreasingmaintenancecostsinvariousindustries.Additionally,furtherresearchcaninvestigatetheeffectofdifferentratiosofMolybdenumdisulfide(MoS2)andTantalum(Ta)onthemechanicalandtribologicalpropertiesofthecompositematerial.Thecurrentstudyusedaratioof1:1,butalteringthisratiomayresultinadifferentsynergyandimpactonthecompositeproperties.Furthermore,exploringtheapplicabilityofothertransition-metaldichalcogenides(TMDs)inthecompositematerialcanalsobroadentherangeofpotentialapplications.

Anotherpotentialresearchdirectionistoinvestigatetheimpactofdifferentprocessingparametersonthepropertiesofthecompositematerial.Forexample,varyingthesinteringtemperature,sinteringtime,andsinteringpressuremayresultinalterationsinthegrainsize,porosity,andoverallcompositemicrostructure.Furthermore,exploringtheimpactofpost-processingtreatmentssuchasannealingorcoatingmayenhancethepropertiesofthecompositematerial.

Finally,theimpactofthecompositematerialontheenvironmentandsustainabilitycanbeinvestigated.Themanufacturingprocessandusageofthecompositematerialmayresultinthereleaseofpotentiallyharmfulmaterialsorgases.Exploringmethodstomitigatetheseimpacts,suchasrecyclingorreducingwaste,canpromotemoresustainableandeco-friendlyproduction.

Inconclusion,theM_0S_2-T_a-M_0self-lubricatingcompositematerialhasvastpotentialforenhancingthemechanicalandtribologicalpropertiesofvariousmechanicalcomponents.Furtherresearchcanfocusonoptimizingthemanufacturingprocess,investigatingtheimpactofdifferentprocessingparameters,exploringpotentialsustainabilityconcerns,andbroadeningtherangeofapplications.Sucheffortscancontributetothedevelopmentofmoreadvancedandefficientself-lubricatingcompositematerials,benefitingmultipleindustriesandpromotingsustainability.Iagree,andIthinkthatinvestigatingthepropertiesofthesecompositematerialsunderdifferentenvironmentalconditionscanalsobeinteresting.Forexample,examiningtheireffectivenessinextremetemperatures,pressures,orcorrosiveenvironmentscanprovidevaluableinsightsintotheirper