EVALUATION OF MECHANICAL AND TRIBOLOGICAL PROPERTIES OF HARDMETAL COATINGS DEPOSITED BY HVOF THERMAL SPRAYING METHOD

This article deals with the evaluation of the microstructure and tribological and mechanical properties of hardmetal coatings based on WC and CrC, which were applied to the base material S235JR by the HVOF thermal spraying technology. Experiments such as microhardness HV0.3, superficial hardness HR15N, adhesion determination, abrasive wear and reciprocating sliding wear test were performed to compare the properties of the coatings and see how they differ depending on the selected additive material. Most of the tested coatings generally had high hardnesses, high wear resistance and reduced coefficient of friction, but were not significantly different. The only exception was the coating with the chemical composition 70(WC/Cr3C2)-21Ni9Cu, where the properties were significantly worse.