INVESTIGATION OF THE STRUCTURAL PHASE STATE OF HIGH-STRENGTH CR3C2-NICR COATINGS OBTAINED BY HVOF METHOD
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Abstract
The study investigated the formation of the composition of a Cr3C2-NiCr coating obtained by the high-velocity oxy-fuel (HVOF) spraying method on the E110 zirconium alloy using structural-phase and microstructural characterization. The aim is to evaluate the technological feasibility of the HVOF process for the zirconium alloy and to identify factors influencing the achievement of the target set of properties. Phase analysis revealed a multiphase state of the coatings, including Cr3C2 carbide, Cr23C6 lower carbide, and CrNi3 intermetallic compound. According to energy-dispersive analysis, a uniform layer with a thickness of 10–78 μm was formed, without columnar morphology and with continuous bonding at the “substrate–coating” interface, indicating satisfactory adhesion. Spectral analysis of sample A showed: Ni – 78.504%, Cr – 17.032%, O – 3.447%, C – 1.017%; sample B showed: Ni – 66.405%, Cr – 29.286%, O – 3.727%, C – 0.581%. The presence of oxygen (3–4%) is associated with spraying in an open atmosphere. In addition, mainly in the transition zone, intergranular and intragranular pores, local microcracks, and layer separation areas were detected; the oxygen content of about 3–4% is due to partial oxidation of the sprayed particles during spraying in an open atmosphere. The overall results confirm the suitability of the HVOF method for obtaining Cr3C2-NiCr coatings on the E110 base and indicate the need to optimize parameters to reduce porosity, limit oxidation, and stabilize the Cr3C2 phase fraction.
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