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, zirconium and niobium compound at their component ratio, wt %: titanium 84.0-90.0, zirconium 4.0-6.0, niobium 6.0-10.0. After that, intermediate layer of nitride or carbonitride of titanium, zirconium and niobium compound is applied at the following component ratio, wt %: titanium 74.0-82.0, zirconium 12.0-16.0, niobium 6.0-10.0. After that, upper layer of nitride or carbonitride of titanium and zirconium compound is applied at the following component ratio, wt %: titanium 89.0-92.0, and zirconium 8.0-11.0. 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 zirconium and located opposite each other, and the third cathode is made from titanium and niobium 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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