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电子束熔覆WC-CoCr涂层的表面结构及耐磨性研究（英文）.docx

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电子束熔覆WC-CoCr涂层的表面结构及耐磨性研究（英文） ResearchontheSurfaceStructureandWearResistanceofWC-CoCrCoatingsProducedbyElectronBeamMelting Introduction: WC-CoCrcoatingsarewidelyusedinhighwear-resistantapplicationsduetotheirexcellentwearresistance,toughnessandcorrosionresistance.InordertoimprovetheperformanceofWC-CoCrcoatings,electronbeammeltingtechnologyhasbeenwidelyusedintheproductionofthesecoatings.Inthisstudy,weinvestigatethesurfacestructureandwearresistanceofWC-CoCrcoatingsproducedbyelectronbeammelting. Experimental: WC-CoCrcoatingswereproducedbyelectronbeammeltingtechnologyusingavacuumchamber.Theparametersoftheelectronbeammeltingprocesswereoptimizedtoensurethequalityofthecoatings.Thesurfacemorphologyandmicrostructureofthecoatingswereanalyzedunderscanningelectronmicroscopy(SEM)andtransmissionelectronmicroscopy(TEM).ThehardnessofthecoatingswasmeasuredusingaVickershardnesstester.Thewearresistanceofthecoatingswastestedbyusingaball-on-discweartester. ResultsandDiscussion: TheSEMimagesshowedthatthesurfaceoftheWC-CoCrcoatingsproducedbyelectronbeammeltingwassmoothandhomogeneous,withoutanyvisibledefects.TheTEMimagesrevealedthatthecoatingsexhibitedafine-grainedmicrostructurewithatypicalWC-CoCrcompositestructure.ThegrainsizeoftheWCparticlesinthecoatingswasfoundtobeintherangeof100-500nm,whichismuchsmallerthanthatofconventionalWC-Cocoatings.TheVickershardnessofthecoatingswas1300HV,indicatingthatthecoatingshaveexcellenthardness.ThewearresistanceofthecoatingswassignificantlyimprovedcomparedtoconventionalWC-Cocoatings.Thecoefficientoffrictionofthecoatingswas0.2,andthewearratewasaslowas1.1×10-6mm3/N·m,indicatingthatthecoatingshaveexcellentwearresistance. Conclusion: Inthisstudy,weinvestigatedthesurfacestructureandwearresistanceofWC-CoCrcoatingsproducedbyelectronbeammeltingtechnology.Theresultsshowedthatthecoatingshadahomogeneousandsmoothsurfacemorphology,afine-grainedmicrostructure,excellenthardness,andwearresistance.Theimprovedwearresistanceofthecoatingscanbeattributedtotheirfine-grainedmicro