Friction processing of plasma layered Ni + WС – 12 wt. % Co + Ni + WС – 12 wt. % Co + Ni coating on a cylindrical titanium substrate

An analysis of the microstructure and microhardness of the Ni + WС – 12 wt. % Co + Ni + WС – 12 wt. % Co + Ni plasma layered coating on a cylindrical titanium substrate after friction processing (FT) was performed simultaneously with two high-speed steel tools. The experiments were performed with the rotation of the substrate and the movement of the tools along the generatrix of the substrate. The main parameters of the FD, the linear speed of the coating during its rotation and the shear force of the tools on the coating, determine the power of the process up to 0.77 kW. The work performed on the coating, related to its area, 34 J/mm2 determines the process temperature up to 1391 °C. Local deformation of the coating during PT on smooth and threaded profiles with a height of 89 – 371 μm of the substrate compacts the coating to a greater extent in its upper part and above the ridges. The microhardness of the WC – 12 wt % Co layer of the coating in the state after plasma spraying with an indenter load of 200 G is 6.91 GPa and 12.09 GPa at Р = 20 G increases with an indenter load of 200 G to 18.92 GPa and with a load of 20 G to 21.56 GPa and correspond to the microhardness values of the sprayed powder.