Abstract:Based on WC-12Co, this paper studied the effects of spray step distance on the uniformity of high velocity oxygen-fuel (HVOF) sprayed coating thickness distribution, morphology, porosity, relative deposition efficiency, Vickers microhardness, fracture toughness, and residual stress. The results show that increasing the spray step distance from 3mm to 10mm only results in a slight decrease of 7% in relative deposition efficiency; however, residual compressive stress is reduced by 37% and fracture toughness is increased by 52%. Besides, there is no significant change or improvement in other properties of the coating. Therefore, when spraying thicker coatings or substrates with variability, the comprehensive performance of the coating can be improved by simply increasing the spray step distance.