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1、SurfaceandCoatingsTechnology108±109(1998)564±569FormationofbilayerNi±SiCcompositecoatingsbyelectrodepositionSunKyuKim,HongJaeYoo*SchoolofMaterialsandMetallurgicalEngineering,UniversityofUlsan,Ulsan680-749,SouthKoreaAbstractCompositeplatingisamethodofc
2、o-depositing®neparticlesofmetallic,non-metalliccompoundorpolymersintheplatedlayertoimprovematerialproperties,suchaswear-resistance,lubrication,orcorrosionresistance.BilayerNi±SiCcompositecoatingswereproducedinthisresearchonthebaseofareportedstudy.Befo
3、reproducingbilayerNi±SiCcompositecoatings,effectsoftheparticlesize,theparticlecontent,thepHoftheelectrolyte,thetemperature,thecurrentdensity,thestirringrateontheamountofSiCdepositedintheNilayerwereinvestigated.Bymanipulatingthecurrentdensityandtheplat
4、ingtimeproperly,bilayerNi±SiCcompositecoatingswereproducedandmechanicalpropertiesofthesecoatingswereevaluatedbymicro-indentationhardnesstests.Ó1998ElsevierScienceS.A.Allrightsreserved.Keywords:Compositecoating;Functionallygradientmaterials;Bilayer;Ni±
5、SiC;Electrodeposition1.IntroductionNi±SiCFGM,weinvestigatedeffectsoftheparticlesizeofSiC,thecurrentdensity,stirringratesontheco-deposi-Compositeelectroplatingisamethodofco-depositingtionofSiCintheplatedNilayer.Throughthemanipula-®neparticlesofmetallic
6、,non-metalliccompoundsortionoftheseprocessvariables,abilayerstructureofpolymersintheplatedlayertoimprovematerialpropertiesNi±SiCwasproduced.suchaswear-resistance,lubrication,orcorrosionresist-ance.Nickel,copper,andchromiumweremainlyusedasametalmatrix,
7、andiron,cobalt,silver,gold,nickel±phos-phorousandnickel±boronwerealsostudied[1±6].Metals,2.Experimentalproceduremetaloxides,carbides,boridesandpolymerswereusedasco-depositingparticles.Diamondandceramicparticles,Theparticlesizeofthesiliconcarbideusedin
8、thesuchassiliconcarbides,wereusedforwear-resistantexperimentwas1.2,8.0,14.0and20.0mm.Theparticlecompositeplating,whereasMoSandPTFEwereusedforshapewasamixtureofroundandaccicularshapes.The2lubricity[7].platingelectrolytewasanickelsulfamatebathof
