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

FIELD: metallurgy.

SUBSTANCE: vacuum-plasma application of the multi-layer coating is performed, with lower layer of niobium nitride applied first, followed by upper layer of nitride of titanium, aluminium and silicon at the following ratio, wt %: titanium 87.7-91.9, aluminium 7.0-11.0, silicon 1.1-1.3. Application of coating layers is performed with three cathodes located horizontally in one plane, the first one made of titanium and aluminium alloy, the second one of niobium and located opposite to the first one, and the third one of titanium and silicon alloy and located between them. Bottom layer is applied with the help of the second cathode while top layer is applied by first and third cathodes.

EFFECT: higher cutting efficiency.

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