WC-Co(Cr)超音速火焰喷涂粉末和涂层性能  

High-velocity oxygen fuel sprayed WC-Co(Cr)powders and coating properties

作　　者：周伍喜[1,2] 李玉玺 颜维 易长宾 杨再江 

机构地区：[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

出　　处：《粉末冶金材料科学与工程》2014年第5期805-811,共7页Materials Science and Engineering of Powder Metallurgy

基　　金：国家科技支撑计划资助项目(2012BAE06B02)

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（~13 s/50g），松装密度接近（4.8~5.0 g/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（1200~1300 HV300 g）；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。WC12Co, WC17Co, WC10Co4Cr coatings were prepared by super high velocity oxygen fuel spray with the same sprayed parameters using agglomerated and sintered WC12Co, WC17Co, WC10Co4Cr powders with particle size range of-45~＋15μm. The properties of powders and coatings were characterized by means of optical microscopy, X-ray diffraction analysis, microhardness meter and so on. The results indicate that all powders exhibit good flow-ability （~13 s/50 g） and spherical morphologies and nearly the same apparent density（4.8~5.0 g/cm3）;WC and Co phases are detected in all the powders; the microstructure and physical properties of all the powders are suitable for the spraying. High deposition efficiency （52%~55%） and Vickers microhardness （1 200~1 300 HV300 g）, low porosity （〈1.1%）, are obtained for coatings; WC, W2C phase and amorphous or nanocrystalline phase were detected in all coatings; the results of abrasive wear rate show that WC10Co4Cr coating has the best abrasive wear resistance than other two coatings under the same spray parameter;WC10Co4Cr coating also has the best corrosion resistance in salt fog exposure.

关 键 词：热喷涂 硬质合金 碳化钨 磨损 腐蚀 

分 类 号：TG174[金属学及工艺—金属表面处理]