The Wear Behavior of HVOF Thermally Sprayed WC-Co Coatings

In this paper, the wear behavior of high velocity oxy fuel thermally sprayed WC-12Co coatings has been studied. The effect of the main process parameters of HVOF thermal spraying (independent parameters) on the temperature of particles and phase degradation (dependent parameters) of WC-12Co coatings on the wear behavior was studied. Four more effective parameters such as spray distance, oxygen to fuel ratio, powder feed rate and gun travel speed were selected as inputs. Taguchi approach was used for design of experiments. Spray Watch diagnostic system, scanning electron microscopy (SEM) and X-ray diffraction were used for this purpose. The pin on disc method was used to evaluate the wear behavior of coat ings. The statistical results showed that the temperature of particles has the most influence on the phase degradation as well as wear behavior. Therefore the more particle temperature the more degradation of WC and finally the more wear resistance.