Promising WC-30WB-10Co Cemented Carbide Coating with Improved Density and Hardness Deposited by High Velocity Oxy-Fuel Spraying: Microstructure and Mechanical Properties

Abstract WC-Co coatings sprayed by HVOF attracted much attentions, benefiting from the satisfactory wear resistance and high bonding strength to steel substrates. Nevertheless, density of conventional required excessive Co binder, which decreased hardness operation life. Based on this, a strengthened WC-30WB-10Co coating was developed with both improved hardness, using high-qualified thermal composite powders. Comparison between phase composition, microstructure, interfacial properties newly WC-12Co clarified in detail. Compared powders, spherical powders showed higher apparent flowability, due situ formed CoWB CoW 2 B phases during accelerated metallurgy reaction. Oxidation decarburization were confirmed spraying formation W C, 3 C 6 coatings. Attracting microhardness 1639HV0.3 relative 99.44% achieved, than those 1222 HV0.3 99.27% WC-12Co. This attributed ternary compounds consumption ductile binder The hard alloy are expected be well applied aggressive corrosion environments low metal content.