CAJ | 학술논문

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。
채용분무조립화진공소결공예제비립도15~45μm 적 WC-12%Co(WC12Co)、WC-17%Co(WC17Co)、WC-10%Co-4%Cr(WC10Co4Cr)구형분도분말，병채용초음속화염분도(HVOF)법재동일분도삼수하제비WC12Co, WC17Co, WC10Co4Cr도층，응용금상현미경、X-사선연사의、소묘전경、현미경도계등표정분말화도층적결구화성능。결과표명：제비적3충탄화오기분도분말구형도고，류동성호(~13 s/50g)，송장밀도접근(4.8~5.0 g/cm3)，분말물상균위WC화Co상，각분말미관결구화물이성능균만족액체연료HVOF분도요구；3충분말제비적도층적침적솔고(52%~55%)、공극솔저(<1.1%)、현미경도고(1200~1300 HV300 g)；각도층탈탄정도소，도층물상균위WC、W2C화비정혹납미정상；상동분도공예하WC17Co、WC12Co、WC10Co4Cr도층적내마립마손성능의차증강，동시WC10Co4Cr도층구유교강적내염무부식성능。
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.