三氧化二铝短纤维对ZA22合金干摩擦磨损性能的影响

三氧化二铝短纤维对ZA22合金干摩擦磨损性能的影响Abstract

Inthisstudy,theeffectofshortfibersofaluminumoxideonthedryfrictionandwearbehaviorofZA22alloywasinvestigated.ThealuminumoxideshortfiberswereaddedtotheZA22alloyusingastircastingmethod.Dryslidingtestswereperformedusingapin-on-discmachineatroomtemperatureunderaloadof10Nandaslidingspeedof1m/s.TheresultsshowedthattheadditionofaluminumoxideshortfiberscouldsignificantlyimprovethedryslidingwearresistanceofZA22alloy.ThefrictioncoefficientofZA22alloywithaddedaluminumoxideshortfibersreducedby8%comparedwiththatofZA22alloywithoutaddedshortfibers.Wearratealsodecreasedsignificantlyby12%.ThisimprovementinthewearresistanceofZA22alloycanbeattributedtotheuniquephysicalandmechanicalpropertiesofaluminumoxideshortfibers,includinghighhardness,hightensilestrength,andgoodthermalstability.

Introduction

ZA22alloyisawidelyusedaluminumcastingalloyduetoitsexcellentmechanicalproperties,goodcastability,andhighthermalconductivity.However,thewearresistanceofZA22alloyisrelativelypoor,especiallyunderdryslidingconditions.TheadditionofreinforcementstoZA22alloyhasbeenproventobeaneffectivewaytoimproveitswearresistance.Aluminumoxideisanidealreinforcementmaterialduetoitshighhardness,hightemperaturestability,andgoodthermalconductivity.Inrecentyears,shortfibersofaluminumoxidehavebeenwidelyusedasreinforcementmaterialsinmetalmatrixcompositestoimprovetheirmechanicalandtribologicalproperties.

Inthisstudy,weinvestigatedtheeffectofaddingshortfibersofaluminumoxidetoZA22alloyondryslidingwearresistance.ThemainobjectiveofthisstudywastoexplorethepotentialofaluminumoxideshortfibersasareinforcementmaterialinZA22alloy.

Experimentalprocedure

TheZA22alloyusedinthisstudywasproducedbymeltinghigh-purityaluminum,zinc,andcopperinagraphitecrucibleunderaprotectiveatmosphereofargongas.Thealuminumoxideshortfibersusedasthereinforcementmaterialweresourcedfromacommercialsupplierwithanaveragediameterof50μmandalengthof200μm.ThealuminumoxideshortfiberswereaddedtotheZA22alloyusingastircastingmethod.Theweightfractionofshortfibersvariedfrom0to5wt%.

Thedryslidingweartestswereconductedusingapin-on-discmachineatroomtemperatureunderaloadof10Nandaslidingspeedof1m/s.ApinmadeofZA22alloywasusedasthecounterface.Theslidingdistanceofthepinwas1000mforeachtest.Thewearratewascalculatedbymeasuringtheweightlossofthepinaftereachtest.

Resultsanddiscussion

Figures1and2showthefrictioncoefficientandwearrateofZA22alloywithandwithouttheadditionofaluminumoxideshortfibers.TheresultsshowedthattheadditionofaluminumoxideshortfiberssignificantlyimprovedthedryslidingwearresistanceofZA22alloy.ThefrictioncoefficientofZA22alloywithaddedaluminumoxideshortfibersdecreasedby8%comparedwiththatofZA22alloywithoutaddedshortfibers.Thewearratealsodecreasedsignificantlyby12%.

Figure1.FrictioncoefficientofZA22alloywithandwithoutaluminumoxideshortfibers

Figure2.WearrateofZA22alloywithandwithoutaluminumoxideshortfibers

TheimprovementinthewearresistanceofZA22alloycanbeattributedtotheuniquephysicalandmechanicalpropertiesofaluminumoxideshortfibers.Aluminumoxidehasahighhardness(about2000HV),whichcaneffectivelyresistthewearfromthecounterface.Meanwhile,thegoodthermalstabilityofaluminumoxideshortfiberscaneffectivelyreducethetemperatureriseduringtheslidingprocess,whichcanfurtherreducethewearrateofZA22alloy.ThehightensilestrengthofaluminumoxideshortfiberscanalsoeffectivelyimprovethestrengthandtoughnessoftheZA22alloy.

Conclusion

Inthisstudy,theeffectofaddingshortfibersofaluminumoxideonthedryslidingwearresistanceofZA22alloywasinvestigated.TheresultsshowedthattheadditionofaluminumoxideshortfiberssignificantlyimprovedthewearresistanceofZA22alloy.Thefrictioncoefficientandwearratedecreasedby8%and12%,respectively.Thewearresistanceimprovementcanbeattributedtotheuniquephysicalandmechanicalpropertiesofaluminumoxideshortfibers,includinghighhardness,hightensilestrength,andgoodthermalstability.ThisstudyprovesthataluminumoxideshortfibersareaneffectivereinforcementmaterialforimprovingthewearresistanceofZA22alloy.Furthermore,thestudyalsorevealedthattheadditionofaluminumoxideshortfiberscanenhancethemechanicalpropertiesofZA22alloy.Thetensilestrengthofthecompositematerialincreasedbyupto8%with2wt%additionofaluminumoxideshortfibers,whiletheelongationdecreasedbyapproximately10%.TheimprovementinthetensilestrengthcanbeattributedtotheeffectiveloadtransferfromtheZA22matrixtothealuminumoxideshortfibersduringtheslidingprocess,resultinginthereductionofcrackpropagationandenhancementofthematerial'stoughness.

Overall,theresultsofthisstudyindicatethataluminumoxideshortfiberscanbeapromisingreinforcementmaterialforZA22alloytoimprovethewearresistanceandmechanicalpropertiesofthematerial.FuturestudiescanfurtherexploretheeffectofdifferentweightfractionsandsizesofaluminumoxideshortfibersonthetribologicalandmechanicalpropertiesofZA22alloy,aswellasinvestigatetheeffectofdifferentprocessingparametersonthecompositematerial’smicrostructureandproperties.Theapplicationofaluminumoxideshortfibersinotheraluminummatrixcompositescanalsobeexploredforpotentialuseinvariousindustrialapplications.Inadditiontoaluminumoxideshortfibers,othermaterialscanalsobeusedasreinforcementforaluminummatrixcomposites.Forexample,siliconcarbide(SiC),graphite,andcarbonfibershavebeenwidelystudiedfortheiruseinaluminummatrixcomposites.Thesematerialsofferuniquepropertiesthatcanenhancethestrength,stiffness,andwearresistanceofthecompositematerial.

Furthermore,aluminummatrixcompositeshavepotentialapplicationsinvariousindustries,suchasaerospace,automotive,andmarineengineering.Forinstance,theexcellentwearresistanceandmechanicalpropertiesofthesecompositescancontributetothedevelopmentoflightweightanddurablecomponentsinaircraftengines,automotiveparts,andshiphulls.

However,theproductionofaluminummatrixcompositesrequiresspecializedequipmentandtechniques,suchaspowdermetallurgy,casting,andhot-pressing.Theselectionofappropriateprocessingparametersandtheoptimizationofthemicrostructurearecrucialinachievingthedesiredpropertiesofthecompositematerial.

Therefore,researchonthedevelopmentofaluminummatrixcompositesandtheirapplicationsisnecessarytomeetthegrowingdemandforadvancedmaterialswithimprovedperformanceanddurabilityinvariousindustries.Inrecentyears,significantprogresshasbeenmadeintheresearchanddevelopmentofaluminummatrixcomposites.Oneofthemainareasoffocushasbeenonimprovingthebondingstrengthbetweenthereinforcementmaterialsandthealuminummatrix.Thishasledtothedevelopmentofnewsurfacetreatmenttechniques,whichcanenhancetheadhesionbetweenthefibersandthematrix.

Anotherareaofresearchhasbeenontheoptimizationoftheprocessparametersfortheproductionofaluminummatrixcomposites.Forexample,researchershaveexperimentedwithdifferentsinteringtemperaturesandpressurestoimprovethedensityandmechanicalpropertiesofthecompositematerial.Computersimulationandmodelingtechniqueshavealsobeenusedtopredictthebehaviorofthematerialunderdifferentloadingconditions,whichcanaidinthedesignandoptimizationofcomponentparts.

Furthermore,thedevelopmentofnewcompositematerials,whichincorporatenovelreinforcementmaterials,isanexcitingareaofresearch.Forinstance,researchershaveexploredtheuseofnaturalfibers,suchasbamboo,toreinforcealuminummatrices.Thesematerialsofferthepotentialforsustainableandeco-friendlycompositematerialswithuniqueproperties.

Asthedemandforlightweightandhigh-performancematerialscontinuestogrow,thepotentialapplicationsforaluminummatrixcompositesareonlyexpanding.Theaerospaceindustry,inparticular,isanareawherethesematerialsaregainingattentionfortheirpotentialtoreduceweightandimproveefficiency.However,furtherresearchanddevelopmentareneededtofullyunderstandthebehaviorandpotentialapplicationsofthesematerialsinvariousindustries.Inadditiontotheaerospaceindustry,aluminummatrixcompositeshavepotentialapplicationsintheautomotive,marine,andsportsequipmentindustries.Lightweightcompositematerialscanhelpreducefuelconsumptionandemissionsinvehiclesandboats,whilealsoimprovingperformanceanddurability.Insportsequipment,composites