Abstract:

       WC-10Co4Cr coatings were prepared by high velocity oxy-fuel with different spray distances. The internal structure and wear/corrosion resistance of the coating were studied. The internal structure and phase composition of the coating were analyzed by Metallographic microscope, SEM and XRD. The microscopic structure, microhardness, porosity, density, wear/ corrosion resistance properties were tested. The results showed that the particle stayed in the jet for longer time and in the process of spraying it enlarged the melting degree as the distance increased. As a result, complete flattening of particles was gained which increased the density of coating and the property of wear resistance and corrosion resistance. The coating showed the best property of wear resistance and corrosion resistance at the spray distance of 380 mm.

Key words: High velocity oxy-fuel,    , WC-10Co4Cr coatings,    , Spray distance,    , Wear resistance,    , Corrosion resistance

摘要：         采用超音速火焰喷涂工艺在不同喷涂距离下制备了WC-10Co4Cr涂层,并对其组织结构及耐磨耐腐蚀性能进行了研究。利用金相显微镜、扫描电子显微镜、X射线衍射仪分析了涂层的组织结构和相组成,并测试了涂层显微硬度、孔隙率;对涂层磨损表面进行了观察分析,探讨了涂层的失效形式。结果表明,喷涂距离对涂层的组织结构及耐磨性具有一定影响。适当增加喷涂距离,粒子由于在焰流中停留时间增加而使熔化程度加大,撞击基体后扁平化现象明显。因此,涂层的致密度、耐磨性、耐腐蚀性都有所提高。当喷涂距离为380mm 时,涂层呈现出较好的耐磨性及耐腐蚀性。

关键词: 超音速火焰喷涂,    ,  WC-10Co4Cr涂层,    ,  喷涂距离,   , 耐磨性,    , 耐腐蚀性