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

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 discovered that as the spraying distance increases, the surface roughness of the coatings also increases. Hardness tests indicated that the coating hardness is influenced by the level of decarburization and can be associated with the kinetic energy of the particles and the density of dislocations in the coating. Furthermore, the impact of spraying distance on the friction coefficient of the coatings was examined, which is essential for optimizing their performance 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