超音速火焰喷涂WC-10Co4Cr粒子沉积状态对涂层滑动磨损形貌的影响

本文研究超音速火焰喷涂过程中粒子沉积状态对涂层干滑动摩擦形貌的影响。利用扫描电镜(SEM)观察颗粒撞击基体时的变形形貌和摩擦磨损后的涂层表面形貌,利用能谱分析(EDS)变形颗粒和涂层表面不同磨损区域的成分。研究结果表明成分均匀的粉末颗粒因受热不同而颗粒铺展形貌不同,受热充分的粉末铺展完全,在摩擦中并形成均匀的磨损区；受热不充分的粉末铺展不完全,摩擦过程中易发生WC晶粒脱落形成划痕区,未熔颗粒易在摩擦过程中脱落。成分不均匀的粉末,合金相多的粉末颗粒铺展完全,摩擦中易生产CoCr合金膜；硬质相多的粉末铺展不完全,易产生孔隙。

Effect of WC-10Co4Cr Particles Splats Deposition State on Sliding Wear Behavior of HVOF-Sprayed Coatings

n this paper, the effect of particle deposition state on dry sliding friction morphology of HVOF coating was studied. Scanning electron microscopy (SEM) was used to observe the deformation morphology of the particles impacting the substrate and the surface morphology of the coating after friction and wear. Energy dispersive spectroscopy (EDS) was used to analyze the composition of the deformed particles and different wear areas on the coating surface. The results show that the powder particles with uniform composition have different spreading morphology due to different heating. The powder with sufficient heating spreads completely and forms uniform wear zone in friction; When the powder is not fully heated, the WC grains are easy to fall off and form scratch zone, and the unmelted particles are easy to fall off during the friction process. It is easy to produce CoCr alloy film in friction because the powder with non-uniform composition and more alloy phases are completely spread; The powder with many hard phases is not spread completely, and it is easy to produce pores.