Experimental Study and Modeling of the Adhesion and Cohesion Strength of HVOF Sprayed WC- 10Co- 4Cr Coatings After Grinding Process

Application of cermet coating deposited by High-Velocity Oxygen Fuel (HVOF) has received considerable attention in a variety of industries, nowadays. Since the surface roughness of carbide coatings is higher than the permissible limits under specific conditions, finishing the coated surface by grinding is essential in order to achieve the desired roughness. The present study investigates the effect of simultaneous changes in the grinding parameters including depth of cut, feedrate and cutting speed on the adhesion and cohesion strength of WC-10Co-4Cr coating by HVOF. A full factorial design of experiment was selected for experimental planning and the analysis of variance was employed to find the significant grinding parameters, for the first time. The adhesive and cohesive properties were measured using fracture toughness with Vickers’ Indentation Test. The results showed that adhesion and cohesion strength of WC-10Co-4Cr coating increased after grinding process, and they increased with the increase of the depth of cut and feedrate and the decrease of the cutting speed. The most influencing parameters were the depth of cut, feedrate and cutting speed respectively. At the end of the current study, the relation between the grinding parameters and adhesive and cohesive propertieshas been modeled using regression analysis.