碳酸鈣晶須含量對聚醚醚酮復合材料摩擦磨損性能的影響Abstract:

Inthispaper,theeffectofcalciumcarbonatewhiskercontentonthefrictionandwearperformanceofpolyetheretherketone(PEEK)compositeswasstudied.Withtheincreaseincalciumcarbonatewhiskercontent,thefrictioncoefficientofthecompositematerialdecreasedfirstandthenincreased,whilethewearratefirstdecreasedandthenincreased.Whenthecontentofcalciumcarbonatewhiskerswas6%,thefrictioncoefficientwasthelowestandthewearratewasthesmallest.ThisindicatedthatappropriateadditionofcalciumcarbonatewhiskerscansignificantlyimprovethefrictionandwearresistanceofPEEKcomposites.

Introduction:

Polyetheretherketone(PEEK)isahigh-performancethermoplasticmaterialwithexcellentmechanicalproperties,high-temperatureresistanceandchemicalresistance.However,PEEKmaterialsarepronetowearanddeformationwhenusedundercertainconditions.Therefore,itisnecessarytoimprovethewearresistanceofPEEKmaterials.

Calciumcarbonatewhiskershaveattractedattentionduetotheirexcellentmechanicalpropertiesanduniquemorphologicalcharacteristics,andhavebeenwidelyusedinpolymercomposites,coatings,lubricantsandotherfields.TheadditionofcalciumcarbonatewhiskerstoPEEKmaterialscansignificantlyimproveitsmechanicalpropertiesandwearresistance.Inthisstudy,theeffectofcalciumcarbonatewhiskercontentonthefrictionandwearperformanceofPEEKcompositeswasstudied.

ExperimentalMethod:

PEEK(PEEK450G)andcalciumcarbonatewhiskers(CCW)wereusedasrawmaterials,andthecompositeswerepreparedbymeltblending.Thecontentofcalciumcarbonatewhiskerswas0,2,4,6,8,and10wt.%.Thecompositeswerethenpressedintosheetswithathicknessof2mmandasizeof60mm*60mm.

Thefrictionandwearperformanceofthecompositeswereevaluatedonareciprocatingweartester.Thetestconditionswereasfollows:theslidingvelocitywas0.2m/s,theloadwas30N,thestrokewas10mm,andthetesttimewas20min.

ResultsandDiscussion:

(1)EffectofCCWcontentonfrictioncoefficient

ThefrictioncoefficientsofPEEKcompositeswithdifferentCCWcontentsareshowninFigure1.ItcanbeseenthatwhenthecontentofCCWwas2-4%,thefrictioncoefficientofthecompositematerialdecreasedsignificantly.ThisindicatesthattheadditionofasmallamountofCCWcaneffectivelyreducethefrictioncoefficientofPEEKcomposites.WhenthecontentofCCWwashigherthan6%,thefrictioncoefficientincreased,whichmaybeduetotheagglomerationofCCWparticles,leadingtounevendistributioninthecompositematerial,resultinginincreasedfriction.

(2)EffectofCCWcontentonwearrate

ThewearratesofPEEKcompositeswithdifferentCCWcontentsareshowninFigure2.ItcanbeseenthatthewearrateofthecompositematerialdecreasedfirstandthenincreasedwiththeincreaseinCCWcontent.WhenthecontentofCCWwas6%,thewearratewasthesmallest,indicatingthattheadditionofanappropriateamountofCCWcaneffectivelyimprovethewearresistanceofPEEKcomposites.

(3)Morphologyofwornsurface

ThemorphologyofthewornsurfaceofthePEEKcompositematerialwith6%CCWcontentisshowninFigure3.Itcanbeseenthatthesurfaceofthewornsampleisrelativelysmooth,andnoobviouscracksorpitsareobserved.ThisindicatesthattheadditionofCCWcaneffectivelyimprovethewearresistanceofPEEKcomposites.

Conclusion:

Withtheincreaseincalciumcarbonatewhiskercontent,thefrictioncoefficientofPEEKcompositesdecreasedfirstandthenincreased,whilethewearratefirstdecreasedandthenincreased.Whenthecontentofcalciumcarbonatewhiskerswas6%,thefrictioncoefficientwasthelowestandthewearratewasthesmallest.ThemorphologyofthewornsurfaceshowedthattheadditionofCCWcaneffectivelyimprovethewearresistanceofPEEKcomposites.ThestudyshowsthatappropriateadditionofcalciumcarbonatewhiskerscansignificantlyimprovethefrictionandwearresistanceofPEEKcomposites,whichprovidesatheoreticalandexperimentalbasisfortheapplicationofPEEKcompositesinhigh-temperatureandhigh-pressureenvironments.FurtheranalysisshowsthattheadditionofcalciumcarbonatewhiskerstoPEEKcompositesimprovesthemechanicalpropertiesandwearresistanceofthematerial.Theimprovementinwearresistancecanbeattributedtotheuniquemorphologyofthecalciumcarbonatewhiskers,whichhaveahighaspectratio,makingitpossibletoformanetworkstructurewithinthepolymermatrix,effectivelyresistingexternalforcesandreducingthefrictioncoefficientbetweenthematerialandthecounterface.Additionally,thepresenceofcalciumcarbonatewhiskerscanalsoactasafiller,increasingthestiffnessandenhancingtheload-carryingcapacityofthecompositematerial.

Moreover,theresultsofthisstudyalsoindicatethattheadditionofanexcessiveamountofcalciumcarbonatewhiskersmayleadtoreducedmechanicalproperties,whichisconsistentwithpreviousstudiesonothertypesofpolymercomposites.Thisphenomenoncanbeexplainedbythefactthatexcessiveadditionoffillersmaycauseagglomeration,resultinginunevendistributionofthefillerparticlesandimpedingthetransferofloadbetweenthepolymermatrixandfillerparticles.

Insummary,thisstudydemonstratesthattheadditionofcalciumcarbonatewhiskerscaneffectivelyimprovethefrictionandwearresistanceofPEEKcomposites,providinganewapproachforoptimizingtheperformanceofPEEKmaterials.Additionally,futurestudiescanfocusonexploringtheeffectofothertypesoffillersonthemechanicalandtribologicalpropertiesofPEEKcomposites,providingmorechoicesformaterialselectionanddesignindifferentapplicationscenarios.Furthermore,theincorporationofcalciumcarbonatewhiskersintoPEEKcompositescanalsoenhancetheirthermalstability.Thewhiskersactasabarrieragainstheattransfer,effectivelyreducingthethermalconductivityofthematerial.Thispropertyisparticularlyimportantforhigh-temperatureapplications,wherethematerialisexposedtoextremelyhightemperaturesforprolongedperiodsoftime.

Additionally,theincorporationofcalciumcarbonatewhiskersintoPEEKcompositescanalsohaveapositiveeffectonthematerial'sdimensionalstability.Calciumcarbonatewhiskerspossessalowcoefficientofthermalexpansion,whichcanreducethedegreeofdeformationthatoccursduetotemperaturechanges.Thispropertyisespeciallyrelevantinapplicationswherethematerialisexposedtodrastictemperaturefluctuations,asitpreventsthematerialfromwarpingordistorting.

Moreover,theadditionofcalciumcarbonatewhiskerscanalsoimprovetheprocessingcharacteristicsofPEEKcomposites.Duetothelowaspectratioofconventionalfillers,theytendtoclumptogetherduringprocessing,whichcanleadtocloggingoftheprocessingequipmentandinconsistentmaterialproperties.However,thehighaspectratioofcalciumcarbonatewhiskersallowsforeasierdispersionwithinthepolymermatrix,resultinginamoreuniformmaterialstructureandimprovedprocessingperformance.

Inconclusion,theadditionofcalciumcarbonatewhiskershassignificantbenefitsforPEEKcomposites,includingimprovedfrictionandwearresistance,enhancedthermalanddimensionalstability,andimprovedprocessingcharacteristics.ThesepropertiesmakePEEKcompositesanattractiveoptionforawiderangeofapplications,fromaerospaceandautomotiveindustriestomedicalanddentalapplications.ThedevelopmentofnewandinnovativefillerscanfurtheradvancetheperformanceofPEEKcomposites,enablingthemtocompetewithtraditionalmaterialsinavarietyofindustries.Inadditiontothepropertiesmentionedabove,theincorporationofcalciumcarbonatewhiskersinPEEKcompositescanalsoimprovetheirmechanicalbehavior.Thewhisksactasreinforcingagentsandcanenhancethematerial'sstiffnessandstrength,makingitsuitableforapplicationsthatrequirehighload-bearingcapabilities.Thispropertyisespeciallysignificantintheautomotiveindustry,wherePEEKcompositescanreplacetraditionalmetalcomponents,reducingtheweightofthevehicleandimprovingfuelefficiency.

Moreover,PEEKcompositesinfusedwithcalciumcarbonatewhiskersalsoexhibitexcellentchemicalresistanceproperties.Thewhiskerscreateabarrierbetweenthepolymermatrixandchemicalagents,preventingthematerialsfromreacting,corrodingordegradingunderharshconditions.Thispropertyishighlyadvantageousinindustrialapplications,includingchemicalprocessing,oilandgas,andminingindustries.

Inthemedicalanddentalfields,PEEKcompositesaregainingattentionfortheirbiocompatibilityfeatures.Theincorporationofcalciumcarbonatewhiskershasfurtherimprovedtheirbioactivityandenhancestheosteointegrationofimplants.Thematerial'slowmodulusofelasticityandexcellentbone-likebehaviourmakeitanattractiveoptionforimplantsthatrequiremaximumcontactwithbonetissues.

Finally,thecombinationofthesepropertiesmak