METHOD FOR OBTAINING MULTI-LAYERED COATING FOR CUTTING TOOL Russian patent published in 2012 - IPC C23C14/06 C23C14/24 B23B27/14 

FIELD: metallurgy.

SUBSTANCE: first, vacuum-plasma application is performed in reaction gas environment for lower layer of nitride or carbonitride of titanium, niobium and aluminium compound at their component ratio, wt %: titanium 81.0-89.0, niobium 4.0-8.0, aluminium 7.0-11.0. After that, intermediate layer of nitride or carbonitride of titanium, niobium and aluminium compound is applied at the following component ratio, wt %: titanium 77.0-85.0, niobium 8.0-12.0, aluminium 7.0-11.0. After that, upper layer of nitride or carbonitride of titanium and niobium compound is applied at the following component ratio, wt %: titanium 90.0-94.0, and niobium 6.0-10.0. Application of coating layers is performed with three cathodes horizontally located in one plane; the first and the second of the above cathodes are made from titanium and niobium and located opposite to each other, and the third cathode is made from titanium and aluminium and located between them; at that, lower layer is applied using the first and the third cathodes; intermediate layer is applied using the second and the third cathodes, and upper layer is applied using the first and the second cathodes.

EFFECT: improving operability of cutting tool.

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