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 and aluminium compound at their component ratio, wt %: titanium 85.0-90.0, aluminium 10.0-15.0. After that, intermediate layer of nitride or carbonitride of titanium, aluminium and chrome compound is applied at the following component ratio, wt %: titanium 80.5-87.5, aluminium 6.0-10.0, chrome 6.5-9.5. After that, upper layer of nitride or carbonitride of titanium, aluminium and chrome compound is applied at the following component ratio, wt %: titanium 70.5-79.5, aluminium 14.0-20.0 and chrome 6.5-9.5. 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 aluminium and located opposite to each other, and the third cathode is made from titanium and chrome and located between them; at that, lower layer is applied using the first and the second cathodes; intermediate layer is applied using the first and the third cathodes, and upper layer is applied using the second and the third cathodes.

EFFECT: improving operability of cutting tool.

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