Cermet Plasma Coatings with TiC and TiCrC Carbides

Four plasma cermet coatings with similar compositions based on TiC carbide and NiCrMo matrices with additional Cr3C2, WC carbides, and carbon have been studied. For four cermets, the average oxygen content increases from 0.51 wt % for powders to 0.86 wt % for coatings at the minimum plasma power and does not increase with its increase. The maximum average nitrogen content in coatings is 0.34 wt % and is determined by the nitrogen content in the plasma. During the spraying of coatings, the loss of carbon relative to the initial composition of powders is 2.79-3.76 wt %, which is less than in the manufacture of powders for spraying (4.3-6.6 wt %). Carbides Cr3C2 and WC, matrix elements, and the content of additional carbon determine the formation of an annular zone around the TiC carbide and increase the total content of carbides in the coating from 60 to 74-83 wt %. With an indenter load of 200 g, the microhardness of the coating is 18 GPa.