Purpose. For forming a protective coating on the working surfaces of a cutting tool.
Scope. Cutting tool manufacturing enterprises.
Advantages. The proposed technology for applying multifunctional nanocrystalline coatings to a cutting tool based on a superhard polycrystalline material with elements of cubic boron nitride has no domestic or foreign analogues.
Description. A technology has been developed for forming a protective coating on the working surfaces of a cutting tool equipped with superhard polycrystalline materials based on cubic boron nitride. The coating consists of three layers: the upper Al2O3, 1.5 μm thick, helping to prevent oxidation of the material of the tool working surfaces at high temperatures; intermediate NbN, 3.0 μm thick, reducing abrasive adhesive destruction of the tool; lower Ti, 0.5 μm thick, which ensures the adhesive strength of the coating-backing contact. The technology can be implemented at enterprises that manufacture cutting tools based on superhard polycrystalline material with elements of cubic boron nitride and have equipment for vacuum-plasma deposition. The cutting tool is equipped with polycrystalline superhard materials based on cubic boron nitride with a protective coating of Al2O3-NbN-T and tested in industrial conditions.