METHOD FOR PRODUCTION OF MULTILAYER COATING FOR CUTTING TOOL Russian patent published in 2018 - IPC C23C14/06 C23C14/24 B23B27/14 

FIELD: technological processes.

SUBSTANCE: application of multilayer coating is performed. First, a lower layer of titanium and aluminium nitride is applied, with their ratio, wt %: titanium 70.0-79.0, aluminium 21.0-30.0. Then, an intermediate layer of titanium, aluminium and chrome compound nitride is deposited at a ratio, wt %: titanium 70.5-79.5, aluminium 14.0-20.0, chrome 6.5-9.5. Then, the top layer of titanium nitride is applied. The application of the coating layers is carried out by three cathodes arranged horizontally in one plane, the first of which is made of a titanium and aluminium alloy, the second one is made of titanium and chrome and arranged opposite the first one, and the third one is made of titanium and arranged between them, while the lower layer is applied using the first cathode and the third cathode, the intermediate layer - using all three cathodes, and the upper layer - using the third cathode.

EFFECT: higher operating capability of the cutting tool.

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