INVESTIGATION OF THE EFFECT OF THE SPRAYING DISTANCE ON THE PROPERTIES OF CR3C2-NICR METAL-CERAMIC COATINGS OBTAINED BY THE HVOF METHOD

Abstract

In this paper, Cr₃C₂-NiCr metal-ceramic coatings obtained by high-velocity oxygen fuel spraying (HVOF) at various spraying distances are studied. A detailed morphological characterization of the cross section of the coatings was carried out using scanning electron microscopy (SEM) with backscattered electrons (BSE). It was found that the particle size of chromium carbide Cr₃C₂ varies depending on the deposition distance. Morphology analysis also revealed the distribution of pores, which is important for the wear resistance of coatings. It was also found that as the spraying distance increases, the surface roughness of the coatings increases. The measurement of the hardness of the coatings showed that the hardness of the coatings depends on the degree of decarburization and can be related to the kinetic energy of the particles and the number of dislocations in the coating. In addition, the effect of the spraying distance on the coefficient of friction of coatings has been studied, which is important for optimizing their use in wear conditions. These results can be useful in the development and optimization of cermet coatings to increase their wear resistance and efficiency in various industrial conditions.