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1、SiCcoattingbylasercladdingSciencePressAvailableonlineatwww.sciencedirect.com●Cl毫NC置oIR置CT0Trans.NonferrousMet.Soc.China16(2006)643—646TransactionsofNonferrousMetalsSocietyofChinaWWW.CSU.edu.cn/ysxb/StructureanderosionresistanceofNi60A/SiCcoattingbylasercladding
2、LOUBai-yang(楼白杨),CHENZhen(陈阵),BAIWan-jirI(白万金),DONGGang(董刚)MOEKeyLaboratoryofMechanicalManufactureandAutomation,InstituteofMaterialandSurfaceEngineering,ZhejiangUniversityofTechnology,Hangzhou310014,ChinaReceived27August2005;accepted8February2006Abstract:TheNi6
3、0AandNi60A/SiCcoatingswereobtainedbylasercladdingon0.45%Cstee1.ThemicrostructureandhardnessofthecoatingswerestudiedbySEMandXRD.TheerosionresistancesofNi60AandNi60A/SiCcoatingswerealsoinvestigated.Theresultsshowthatthestructureofdifferentcoatingsisuptothetempera
4、turegradientandsolidingvelocityinmetal-meltingregionduringlasercladdingprocess.111ecoatingsconsistofacladdmglayer,inwhichdendriticcrystalandbulkycell—likecrystalexistmainly,andathermo.affectedlayer.Ni60A/SiCcoatinghashighermicrohardnessthanthatofNi60Acoating.wh
5、ichismainlycausedbySiCandcomplicatedphasesformedbyNi.Cr,Fe.CandSi.ItisobviousfromtheerosiontestthattheNi60A,SiCcoatinghashigherosionresistance.Keywords:lasercladding;Ni60A;SiC;erosionresistance1IntroductionLasercladdingisusinghighenergydensitylaserbeamtomeltthe
6、claddingmaterialsandmakesthemcoagulateonthesurfaceofthebasematerials.Lasercladdingcoatinghashistrength,goodprocessproperty,highwearresistance,erosionresistance,heatresistanceandsoon,showingmanyenga'neeringapplications,whichisbecomingoneofthebestimportantresearc
7、hdomaininthelasermanufacture[1—6].Thecoatingsaremadebytwomainmethods:powderfeedingandprefabricating.Contrastedwithpowderfeedingmethod,prefabricatingmethodcanformgrain—strengtheningcompositecoatings.Asceramicshasmanyadvantages,themetal/ceramiccompositecoatingsby
8、prefabricatingandpowderfeedinginlasercladdinghavebeenstudiedmoreandmoreinrecentyearsandadditionofpowderceramicssuchasWC,A1203andTiCintothecoatingwasreportedinmanyresearchwor
