METHOD OF PRODUCING MULTI-LAYER COATING FOR CUTTING TOOL Russian patent published in 2017 - IPC C23C14/24 C23C14/06 B23B27/14 C23C30/00 

FIELD: technological processes.

SUBSTANCE: applying a multilayer coating is carried out. First, a lower layer of titanium nitride and aluminium is applied at the ratio, wt %: titanium 83.5-89.5, aluminium 10.5-16.5. Then an intermediate layer of nitride of a titanium, aluminium and zirconium compound is applied at the ratio, wt %: titanium 73.0-81.0, aluminium 7.0-11.0, zirconium 12.0-16.0. Then, a 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 a titanium and zirconium alloy and arranged opposite the first one, and the third one is made of titanium and arranged between them, the lower layer being 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: increasing the cutting tool efficiency.

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