WSi2MoSi2復(fù)合材料的磨擦磨損特性

Abstract

WSi2MoSi2compositematerialiswidelyusedintheaerospace,

automobileandotherhigh-techfieldsduetoitsexcellent

mechanicalandphysicalproperties.Inordertoexplorethefriction

andwearpropertiesofthematerial,aseriesoftestswerecarried

outonWSi2MoSi2compositematerialinthisstudy.The

experimentusedpin-on-discslidingcontactmethodtosimulatethe

frictionandwearbehaviorofthematerialunderdifferentloadsand

slidingspeeds.Thewearvolumeandwearrateofthematerial

weremeasured,andthewearmechanismwasanalyzed.Theresults

showedthatunderthesametestconditions,thematerialexhibits

excellentwearresistanceandfrictionalproperties,andthewear

ratedecreaseswiththeincreaseoftheslidingspeedandload.The

frictioncoefficientofthematerialincreaseswiththeincreaseof

theslidingspeedandload.Thewearmechanismofthematerialis

mainlyabrasivewearandadhesivewear.Insummary,WSi2

MoSi2compositematerialhasexcellenttribologicalpropertiesand

isapromisingmaterialforhigh-loadandhigh-speedapplications.

Keywords:WSi2MoSi2,frictionandwear,pin-on-disc,wear

mechanism

Introduction

WSi2MoSi2compositematerialisanewtypeofhigh-temperature

structuralmaterial,whichhasexcellentthermalstability,high-

temperaturestrength,oxidationresistance,andcorrosionresistance

[1-2].Becauseofitsexcellentproperties,ithasbeenwidelyused

intheaerospace,automobileandotherhigh-techfields[3-4].

However,theperformanceofthematerialissignificantlyaffected

bythefrictionandwearproperties,whichlimitsitsapplication

range[5-6J.Therefore,thestudyofthefrictionandwearproperties

ofWSi2MoSi2compositematerialhasimportantpractical

significance.

Inthisstudy,thepin-on-disctestmethodwasusedtoinvestigate

thefrictionandwearbehaviorofWSi2MoSi2compositematerial.

Theinfluenceoftheslidingspeedandloadonthefrictionand

wearpropertiesofthematerialwasstudied,andthewear

mechanismwasanalyzed.

ExpeiimentalProcedure

Materials

TheWSi2MoSi2compositematerialusedinthisexperimentwas

preparedbypowdermetallurgymethod.Thecompositionofthe

materialisshowninTable1.

Table1.CompositionofWSi2MoSi2compositematerial

ComponentPercentagebyweight(%)

WSi230

MoSi270

ExperimentalSetup

Thepin-on-disctestmethodwasusedtostudythefrictionand

wearbehaviorofWSi2MoSi2compositematerial.Theschematic

diagramoftheexperimentalsetupisshowninFigure1.Asteel

discwithadiameterof80mmandathicknessof5mmwasused

asthefrictioncouple,andthecompositematerialwasmadeintoa

cylindricalpinwithadiameterof10mmandalengthof20mm.

Thetestwascarriedoutonauniversalmaterialtestingmachineat

roomtemperatureunderdryslidingconditions.

Figure1.Schematicdiagramoftheexperimentalsetup.

TestProcedure

Thetestswereconductedunderdifferentloads(10-50N)and

slidingspeeds(0.5-1.5m/s).Thefrictioncoefficientandwear

volumewererecordedduringthetest,andthewearratewas

calculated.

ThewearmechanismofthematerialwasanalyzedbySEM

(scanningelectronmicroscope)andEDS(energy-dispersive

spectrometer)analysisofthewornsurface.

ResultsandDiscussion

FrictionCoefficient

Thevariationofthefrictioncoefficientwithslidingspeedandload

isshowninFigure2.Itcanbeseenthatthefrictioncoefficientof

thematerialincreaseswiththeincreaseofslidingspeedandload.

Whentheloadis10Nandtheslidingspeedis0.5m/s,thefriction

coefficientisabout0.25.Whentheloadis50Nandthesliding

speedis1.5m/s,thefrictioncoefficientisabout0.45.Theincrease

offrictioncoefficientmayberelatedtotheincreaseofcontact

pressureandtemperature.

Figure2.Variationoffrictioncoefficientwithslidingspeedand

load.

WearVolume

Thevariationofwearvolumewithslidingspeedandloadisshown

inFigure3.Itcanbeseenthatthewearvolumeofthematerial

increaseswiththeincreaseofslidingspeedandload.Whenthe

loadis10Nandtheslidingspeedis0.5m/s,thewearvolumeis

about2.3x10-8mm3.Whentheloadis50Nandthesliding

speedis1.5m/s,thewearvolumeisabout1.2x10-7mm3.

Figure3.Variationofwearvolumewithslidingspeedandload.

WearRate

Thevariationofwearratewithslidingspeedandloadisshownin

Figure4.Itcanbeseenthatthewearrateofthematerialdecreases

withtheincreaseofslidingspeedandload.Whentheloadis10N

andtheslidingspeedis0.5m/s,thewearrateisabout4.6x10-7

mm3/Nm.Whentheloadis50Nandtheslidingspeedis1.5m/s,

thewearrateisabout2.0xl0~7mrrP/Nm.

Figure4.Variationofwearratewithslidingspeedandload.

SEMandEDSAnalysis

TheSEMandEDSanalysisofthewornsurfaceofthematerial

underdifferenttestconditionsareshowninFigure5.Itcanbeseen

thatthewearmechanismofthematerialismainlyabrasivewear

andadhesivewear.Whentheloadandslidingspeedaresmall,the

abrasivewearisdominant.Whentheloadandslidingspeedare

large,theadhesivewearisdominant.

Figure5.SEMandEDSanalysisofthewornsurfaceofthe

material.

Conclusion

Inthisstudy,thefrictionandwearbehaviorofWSi2MoSi2

compositematerialwasinvestigated.Themainconclusionsareas

follows:

1.WSi2MoSi2compositematerialexhibitsexcellentfrictionand

wearpropertiesunderdifferenttestconditions.

2.Thefrictioncoefficientofthematerialincreaseswiththe

increaseofslidingspeedandload.

3.Thewearvolumeandwearrateofthematerialincreasewiththe

increaseofslidingspeedandload.

4.Thewearmechanismofthematerialismainlyabrasivewear

andadhesivewear.

Insummary,WSi2MoSi2compositematerialhasexcellent

tribologicalpropertiesandisapromisingmaterialforhigh-load

andhigh-speedapplications.Thestudyprovidesatheoreticalbasis

andexperimentaldataforfurtheroptimizingtheperformanceof

thematerial.TheexcellentfrictionandwearpropertiesofWSi2

MoSi2compositematerialmakeitpreferableforhigh-temperature

andhigh-loadapplicationsinmodernindustries.Duetoitsunique

chemicalcomposition,WSi2MoSi2compositematerialexhibitsa

highresistancetowardsoxidationandcorrosion,whichfurther

enhancesitswearresistanceproperties.Therefore,ithasgreat

potentialinaerospace,automobile,andenergyindustries.

Theresultsofthestudyhighlightthatthevariationofthesliding

speedandloadhasasignificantimpactonthefrictionandwear

behaviorofthematerial.AdetailedanalysisoftheSEMandEDS

showedthatabrasivewearandadhesiveweararetheprimarywear

mechanismsthatcontributetothelossinthematerial.Furthermore,

theincreaseintheslidingspeedandloadnotonlycausesan

increaseinthewearvolumebutalsoadecreaseinthewearrateof

thematerial.Thisbehaviorismainlyduetotheformationofhigh-

temperaturephasesatthecontactpointduetoincreasedsliding

speedandload,whichenhancesthematerial'sresistancetowear.

Inconclusion,thepresentstudyprovidesexperimentalresultsfor

furtheroptimizationofWSi2MoSi2compositematerial's

tribologicalproperties.Theresultsalsoindicatethatthecomposite

materialcanholdgreatpotentialasawear-resistantmaterialfor

high-temperature,high-loadapplicationsinmodernindustries.

However,furtherresearchonthemateriaFswearmechanismsand

optimizationofitspropertiesisrequiredforitspractical

applicationatanindustrialscale.Apartfromitsimpressive

tribologicalproperties,WSi2MoSi2compositematerialalso

exhibitsexcellentmechanicalproperties.Thisincludesahigh

elasticmodulusandhighstrength,makingitanidealmaterialfor

applicationsthatrequirehigh-strengthcomponents,suchas

turbinesandengineparts.Themateriafselectricalproperties,such

asitshighelectricalconductivity,alsomakeitsuitableforusein

electroniccomponentssuchassensorsandheatingelements.

SeveralmethodshavebeenusedtofabricateWSi2MoSi2

compositematerial,includingpowdermetallurgy,sintering,and

hotpressing.Thesemethodshavebeenoptimizedtoachieveahigh

degreeofhomogeneityanduniformdistributionofbothWSi2and

MoSi2phases,whichenhancesdiemalerial^tribologicaland

mechanicalproperties.Thecompositematerialhasalsobeen

subjectedtoseveralheattreatmentprocessestomodifyits

microstructureandimproveitsproperties.

FutureresearchonWSi2MoSi2compositematerialwillfocuson

optimizingitspropertiesforspecificapplications.Forinstance,

researchersmayexploretheuseofdifferentreinforcement

materialstoimprovethematerial'swearresistanceforspecific

applications.Theymayalsoinvestigatetheuseofdifferent

processingtechniques,suchasadditivemanufacturing,tofabricate

complexcomponentswiththematerial.

Inconclusion,thestudyofWSi2MoSi2compositematerialhas

shownitsremarkabletribologicalandmechanicalproperties,

makingitapromisingmaterialforuseinhigh-temperatureand

high-loadapplicationsinmodernindustries.Withfurtherresearch

anddevelopment,thismaterialhasthepotentialtorevolutionize

themanufacturingprocessesacrossmanyindustries.Oneareaof

potentialapplicationforWSi2MoSi2compositematerialisinthe

aerospaceindustry.ThemateriaFsexcellenttribologicaland

mechanicalpropertiesmakeitidealforuseinhigh-temperature

andhigh-loadcomponentssuchascombustionchambers,turbine

blades,andexhaustnozzlesforaircraftengines.Ryusingthis

compositematerial,aerospacemanufacturerscanincreasethe

durabilityandreliabilityoftheircomponents,reducing

maintenancecostsandimprovingsafety.

WSi2MoSi2compositematerialalsoshowspromiseforuseinthe

automotiveindustry.ThemateriaFshighstrengthandwear

resistancemakeitsuitableforuseinenginecomponentssuchas

pistons,valves,andbearings.Additionally,themateriafshigh

electricalconductivitycouldbeusefulinelectroniccomponents

suchassensorsandignitionsystems.

Intheenergysector,WSi2MoSi2compositematerialcouldbe

usedingasturbinesandotherhigh-temperatureapplications.The

material'sexcellenttribologicalpropertieswouldreducefriction

andwear,increasingtheefficiencyandlifespanofthesedevices.

Thecompositematerialcouldalsobeusedinnuclearreactors,

whereitshighmeltingpointandradiationresistancemakeitan

idealmaterialforuseinfuelcladdingandothercomponents.

Finally,WSi2MoSi2compositematerialcouldalsofind

applicationsinthemedicalanddentalindustries.Themateriafs

biocompatibilityandcorrosionresistancemakeitsuitableforuse

inimplantsandprosthetics,whileitshighstrengthandwear

resistancecouldmakeitusefulfordentaldrillsandinstruments.

Inconclusion,WSi2MoSi2compositematerialhasthepotentialto

revolutionizemanufacturingprocessesacrossarangeofindustries.

Itsremarkabletribologicalandmechanicalpropertiesmakeitideal

foruseinhigh-temperatureandhigh-loadapplications,and

ongoingresearchanddevelopmentwilllikelyuncoverevenmore

potentialapplicationsforthisversatilematerial.Thereareseveral

advantagesofusingWSi2MoSi2compositematerialinvarious

applications.Oneofthemajorbenefitsisthematerial'sexcellent

tribologicalproperties,suchaslowfrictionandwearresistance,

whichcansignificantlyreducemaintenancecostsandimprovethe

reliabilityofmachinery.Thisalsotranslatestoincreasedefficiency

andenergysavings,makingthematerialidealforuseinenergy-

intensiveindustrieslikeaerospaceandautomotive.

Anotheradvantageisthemateriafshighmeltingpoint,whichis

around2000℃,makingitresistanttoextremetemperaturesevenin

harshenvironmentslikegasturbines,nuclearreactors,