C C-SiC復(fù)合材料的制備及其濕式摩擦磨損性能研究

CC-SiC復(fù)合材料的制備及其濕式摩擦磨損性能研究Abstract：Inthisstudy,CC-SiCcompositematerialswerepreparedbyacombinationofchemicalvaporinfiltration(CVI)andliquidsiliconinfiltration(LSI)methods.ThewetfrictionandwearpropertiesofCC-SiCcompositeswereinvestigatedunderdifferentslidingspeedsandloadsusingaball-on-disktribometer.TheresultsshowedthattheCC-SiCcompositeshadgoodmechanicalandwetfrictionproperties.

Introduction：Carbon-carbon(CC)compositeshavebeenwidelyusedinaerospace,automobileandotherfieldsduetotheirexcellentthermalconductivity,highspecificstrengthandhightemperatureresistance.However,CCcompositeshavepoorwearresistanceandarepronetooxidationunderhightemperatureandhighhumidityconditions.InordertoimprovethewearresistanceandoxidationresistanceofCCcomposites,SiCwasintroducedintotheCCmatrixtoformCC-SiCcompositematerials.TheCC-SiCcompositeshavebeenwidelystudiedandappliedinthefieldsofaerospace,nuclearenergyandhightemperatureengineering.

MaterialsandMethods：TheCC-SiCcompositeswerepreparedbyacombinationofCVIandLSImethods.TheCCpreformwasfirstpreparedbyaCVIprocessusingmethaneasthecarbonsource.TheCCpreformwastheninfiltratedwithliquidsiliconundervacuumtoformtheCC-SiCcompositematerial.ThewetfrictionandwearpropertiesoftheCC-SiCcompositeswereinvestigatedusingaball-on-disktribometer.Theslidingspeedandloadwerevariedtoevaluatethefrictionandwearperformanceofthecomposites.

ResultsandDiscussion：TheCC-SiCcompositesshowedgoodmechanicalandwetfrictionproperties.Thefrictioncoefficientincreasedwithincreasingslidingspeedandload.Thewearrateofthecompositesdecreasedwithincreasingslidingspeedandload,indicatingthatthewearresistanceofthecompositesimprovedunderhigh-speedandhigh-loadconditions.ThemicrostructureoftheCC-SiCcompositeswasanalyzedbyscanningelectronmicroscopy(SEM).TheSEMimagesshowedthattheSiCparticlesweredistributeduniformlyintheCCmatrix,providingexcellentmechanicalpropertiesandwearresistance.

Conclusions：TheCC-SiCcompositematerialsweresuccessfullypreparedbyacombinationofCVIandLSImethods.ThewetfrictionandwearpropertiesoftheCC-SiCcompositeswereinvestigatedunderdifferentslidingspeedsandloads.TheresultsshowedthattheCC-SiCcompositeshadgoodmechanicalandwetfrictionproperties,indicatingthattheyhavegreatpotentialforapplicationsinhightemperatureandhighhumidityenvironments.Inadditiontotheirexcellentmechanicalpropertiesandwearresistance,CC-SiCcompositesalsohavegoodthermalshockresistanceandoxidationresistance,makingthemsuitableforapplicationsinhightemperatureenvironments.TheSiCparticlesdispersedintheCCmatrixcanactasreinforcementandinhibitthediffusionofoxygenatoms,thusimprovingtheoxidationresistanceofthecomposites.

TheproductionprocessofCC-SiCcompositesiscomplexandinvolvesmultiplesteps,includingthepreparationoftheCCpreform,infiltrationwithliquidsilicon,andhightemperaturetreatmenttoformtheSiCphase.However,withtheadvancementofmaterialsprocessingtechnologyandtheoptimizationofproductionprocesses,large-scaleproductionofCC-SiCcompositeshasbecomeachievable.

Overall,thecombinationoftheexcellentpropertiesofCCandSiCmakesCC-SiCcompositesapromisingmaterialforvarioushightemperatureandhighhumidityapplications,suchasbrakediscs,thermalprotectionsystems,andfurnacecomponentsintheaerospace,automobile,andindustrialfields.FuturestudieswillfocusonfurtherimprovingthemechanicalandwetfrictionpropertiesofCC-SiCcompositesthroughmaterialdesignandprocessingoptimization.OnepotentialapplicationofCC-SiCcompositesisintheaerospaceindustry.Thesecompositescouldbeusedforthermalprotectionsystemsonspacecraftandreusablelaunchvehicles,astheyhavehightemperatureresistanceandlowcoefficientofthermalexpansion.Inaddition,CC-SiCbrakediscshavebeensuccessfullytestedinaircrafts,showingexcellentwearresistanceandhighbrakingperformance.

Intheautomotiveindustry,CC-SiCcompositescouldbeusedforbrakediscsandclutchcomponentsinhighperformancevehicles.Thewearresistanceandthermalpropertiesofthesecompositesmakethemidealforsuchapplications.Additionally,thelightweightnatureofCC-SiCcompositescouldimprovefuelefficiencyandreduceemissions.

Intheindustrialfield,CC-SiCcompositescouldbeusedforfurnacecomponents,suchaswallsandrefractoryplates,duetotheirhightemperatureresistanceandoxidationresistance.Thesecompositescouldalsobeusefulinotherhigh-temperatureapplications,suchasheatexchangersandgasturbinecomponents.

However,onechallengeforthewidespreaduseofCC-SiCcompositesistheircost.Theproductionprocessiscomplexandrequiresexpensiveequipment,makingthecostofCC-SiCcompositeshigherthantraditionalmaterials.Researchersareworkingondevelopingmorecost-effectiveproductionmethodstomakethesecompositesmoreaccessible.

Inconclusion,CC-SiCcompositesofferexcellentmechanical,thermal,andwearproperties,makingthempromisingmaterialsforvariousapplicationsinhightemperatureandhighhumidityenvironments.Withcontinuedresearchanddevelopment,thesecompositescouldfindwidespreaduseinindustriessuchasaerospace,automotive,andindustrialmanufacturing.AnotherpotentialapplicationofCC-SiCcompositesisintheenergyindustry.CC-SiCcompositeshavebeenusedtodevelopfuelcellcomponentsduetotheirexcellentelectricalconductivityandchemicalresistance.Thesecompositescouldalsobeusedaselectrodesinenergystoragesystems,suchasbatteriesandsupercapacitors.

Moreover,CC-SiCcompositeshavebeenusedtoproducecuttingtoolsformachiningapplications,suchasdrillingandgrinding.Thehighstrength,hardness,andwearresistanceofthesematerialsmakethemidealforsuchapplications,wheretheycanimprovecuttingspeedsandincreasetoollife.

Inthemedicalfield,CC-SiCcompositescouldbeusedasdentalimplantsandprostheticjoints,astheyexhibitgoodbiocompatibilityandwearresistance.Theporousnatureofthesecompositesalsoallowsforbetterintegrationwiththesurroundingbonetissue.

Inthedefenseindustry,CC-SiCcompositescouldbeusedforarmorandprotectivesystemsduetotheirhighstrengthandhardness.Thesecompositescouldalsobeusedinradar-absorbingmaterialsduetotheirlowdielectricconstant.

Finally,CC-SiCcompositescouldbeusedintheconstructionindustry,suchasinflooringandroofingtiles,duetotheirheatandcorrosionresistance.Thesecompositescanalsobeusedtoreinforceorreplacesteelstructuresinbridgesandbuildings,astheyarelightweightandhavehighstrength-to-weightratios.

Overall,theuniquepropertiesofCC-SiCcompositesmakethemattractiveforawiderangeofapplicationsinvariousindustries.Whiletheircostremainsachallenge,continuedresearchanddevelopmentcanhelpmakethesematerialsmorecost-effectiveandaccessibleforwidespreaduse.Intheaerospaceindustry,CC-SiCcompositesofferpotentialusesinaircraftcomponentssuchasenginecomponents,nozzles,andexhaustsystems.Thesematerialshavetheabilitytowithstandhightemperaturesandarelightweight,whichiscrucialforreducingtheweightofanaircrafttoimprovefuelefficiency.

Intheelectronicsindustry,CC-SiCcompositesarebeingexploredforuseinintegratedcircuitsandmicroelectromechanicalsystems(MEMS)duetotheirhighthermalconductivityandlowthermalexpansioncoefficient.Thismakesthemidealforuseinhigh-powerelectronicdevicessuchasthoseusedinspaceapplications.

Inthetransportationindustry,CC-SiCcompositescouldbeusedtoproducehigh-performancebrakepadsduetotheirhighwearresistanceandlowthermalexpansioncoefficient.Inaddition,theirlightweightnaturemakesthemofinterestinthedevelopmentoflightweightautomotivecomponents,suchasbodypanelsandchassisco