WC_Co_Cr_超音速火焰喷涂粉末和涂层性能.docxVIP

Vol.19No.5.2014WC-Co(Cr)超音速火焰喷涂粉末和涂层性能周伍喜1,2，李玉玺2，颜维2，易长宾2，杨再江2(1.中南大学材料科学与工程学院，长沙，410083；2.自贡长城硬面材料有限公司，四川自贡，643000)摘要：采用喷雾造粒和真空烧结工艺制备粒度15~45μm的WC-12%Co(WC12Co)、WC-17%Co(WC17Co)、WC-10%Co-4%Cr(WC10Co4Cr)球形喷涂粉末，并采用超音速火焰喷涂(HVOF)法在同一喷涂参数下制备WC12Co,WC17Co,WC10Co4Cr涂层，应用金相显微镜、X-射线衍射仪、扫描电镜、显微硬度计等表征粉末和涂层的结构和性能。结果表明：制备的3种碳化钨基喷涂粉末球形度高，流动性好(~13s/50g)，松装密度接近(4.8~5.0g/cm3)，粉末物相均为WC和Co相，各粉末微观结构和物理性能均满足液体燃料HVOF喷涂要求；3种粉末制备的涂层的沉积率高(52%~55%)、孔隙率低(1.1%)、显微硬度高(1200~1300HV300g)；各涂层脱碳程度小，涂层物相均为WC、W2C和非晶或纳米晶相；相同喷涂工艺下WC17Co、WC12Co、WC10Co4Cr涂层的耐磨粒磨损性能依次增强，同时WC10Co4Cr涂层具有较强的耐盐雾腐蚀性能。关键词：热喷涂；硬质合金；碳化钨；磨损；腐蚀中图分类号：TG174文献标识码：A文章编号：1673-0224(2014)5-0805-07High-velocityoxygenfuelsprayedWC-Co(Cr)powdersandcoatingpropertiesZHOUWu-xi1,2,LIYu-xi2,YANWei2,YIChang-bin2,YANGZai-jiang2(1.SchoolofMaterialsScienceandEngineering,CentralSouthUniversity,Changsha410083,China;2.ZigongTungstenCarbideCo.,Ltd,Zigong643000,China)Abstract:WC12Co,WC17Co,WC10Co4CrcoatingswerepreparedbysuperhighvelocityoxygenfuelspraywiththesamesprayedparametersusingagglomeratedandsinteredWC12Co,WC17Co,WC10Co4Crpowderswithparticlesizerangeof?45~+15μm.Thepropertiesofpowdersandcoatingswerecharacterizedbymeansofopticalmicroscopy,X-raydiffractionanalysis,microhardnessmeterandsoon.Theresultsindicatethatallpowdersexhibitgoodflow-ability(~13s/50g)andsphericalmorphologiesandnearlythesameapparentdensity(4.8~5.0g/cm3);WCandCophasesaredetectedinallthepowders;themicrostructureandphysicalpropertiesofallthepowdersaresuitableforthespraying.Highdepositionefficiency(52%~55%)andVickersmicrohardness(1200~1300HV300g),lowporosity(1.1%),areobtainedforcoatings;WC,W2Cphaseandamorphousornanocrystallinephaseweredetectedinallcoatings;theresultsofabrasivewearrateshowthatWC10Co4Crcoatinghasthebestabrasivewearresistancethanothertwocoatingsunderthesamesprayparameter;WC10Co4Crcoatingalsohasthebestcorrosionresistanceinsaltfogexposure.Keywords:thermalspray;cementedcarbide;tungstencarbide;wear;corrosion热喷涂碳化钨基(WC12Co,WC17Co，WC10Co4Cr)涂层在工业上有着广泛的应用，能显著提高工件表面的耐磨性和耐腐蚀性，从而延长工