Hardness and wear resistance of carbon nanotube reinforced Cu matrix nanocomposites

Hardness and wear resistance of carbon nanotube reinforced Cu matrix nanocomposites

MaterialsScienceandEngineeringA449–451(2007)

Hardness and wear resistance of carbon nanotube reinforced Cu matrix nanocomposites

46–50

HardnessandwearresistanceofcarbonnanotubereinforcedCumatrixnanocomposites

KyungTaeKim,SeungIlCha,SoonHyungHong

DepartmentofMaterialsScienceandEngineering,KoreaAdvancedInstituteofScienceandTechnology,

373-1Kusung-dong,Yusung-gu,Daejeon305-701,RepublicofKoreaReceived24August2005;receivedinrevisedform16November2005;accepted15February2006

Abstract

Carbonnanotube(CNT)reinforcedCumatrix(CNT/Cu)nanocompositesarefabricatedbyanovelfabricationprocess,namedasmolecularlevelprocess,whichinvolvessuspendingCNTsinsolventbysurfacefunctionalization,mixingCuionswithCNTsuspension,drying,calcinationandreduction.ThemolecularlevelprocessproducesCNT/Cunanocompositepowders,inwhichtheCNTsarehomogeneouslyimplantedwithinCupowders.ThenanocompositepowdersareconsolidatedintoCNT/Cunanocompositesbysparkplasmasintering.ThehardnessandslidingwearresistanceofCNT/Cunanocompositeareenhancedbytwoandthreetimes,respectively,comparedtothoseofCumatrix.TheenhancementofhardnessisduetotheeffectofhomogeneousdistributionofCNTsinCumatrix,goodbondingatCNT/Cuinterfacesandhighrelativedensityofnanocomposites.ThedispersedCNTsinCu-matrixnanocompositegivessigni cantlyenhancedwearresistancebyretardingthepeelingofCugrainsduringslidingwearprocess.

©2006ElsevierB.V.Allrightsreserved.

Keywords:Carbonnanotube;Copper;Nanocomposite;Molecularlevelprocess;Wearresistance

1.Introduction

Severalresearcheshaveshownthatthecarbonnanotube(CNT)canconsiderablyenhancethemechanicalandconduc-tivepropertiesofpolymerandceramicmatrixduringlastdecade[1–3].InCNT/polymernanocomposites,theadditionofcar-bonnanotubeasreinforcementimprovesthestrengthofthepolymermatrixbyseveraltimes[4,5].Althoughtherearesomedoubtonevaluationmethodforfacturetoughness[6],Zhanetal.[7]showedremarkableenhancementoffracturetoughnessinCNT/aluminananocomposite.Ningetal.[8]andMoetal.[9]introducedsol–gelprocessforCNT/SiO2andCNT/Al2O3nanocompositeswhichshowtheenhancementoffracturestrength,hardnessandfracturetoughness.However,comparedtoCNT/polymerandCNT/ceramicnanocompos-ites,CNT/metalnanocompositesattractlessattentionduetotheirinferiormechanicalpropertiesthanexpected.EventhoughseveralresearchershavefabricatedCNT/metalnanocompos-itesbypowdermetallurgyprocessincludingmixingofCNTswithmetalpowdersfollowedbyhotpressing,theCNT/metal

nanocompositeshavefailedtoshowanticipatedenhancementofmechanicalproperties[10,11].InpreviousresearchesonCNT/metalnanocomposites,inferiormechanicalpropertiesaremainlycausedbyagglomerationofCNTsandlowrelativeden-sityofthenanocompositeranged85–95%.Recently,Chaetal.[12]developedthemolecularlevelprocessforhomogeneousdispersionofCNTsinmetalmatrixandusedsparkplasmasinter-ing(SPS)processforhighlydensi edCNT/metalnanocompos-ites.Althoughmostinvestigationshavefocusedonfabricationprocessandmechanicalproperties,veryfewstudieshavebeenreportedonwearpropertiesofCNT/metalnanocomposites.Inthisstudy,CNT/Cunanocompositesarefabricatedbymolecularlevelprocessfollowedbysparkplasmasinteringpro-cessandthemicrostructure,hardnessandwearresistanceofCNT/Cunanocompositesarecharacterized.2.Experimentalprocedures

2.1.FabricationofCNT/Cunanocompositepowdersbymolecularlevelmixingprocess

TheschematicfabricationprocessstepsformolecularlevelprocessofCNT/CunanocompositeareshowninFig.1.The

Correspondingauthor.Tel.:+82428693327;fax:+82428693310.E-mailaddress:shhong@kaist.ac.kr(S.H.Hong).

0921-5093/$–seefrontmatter©2006ElsevierB.V.Allrightsreserved.doi:10.1016/j.msea.2006.02.310

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