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

FIELD: metallurgy.

SUBSTANCE: first, a lower layer of niobium nitride is applied. Then, an upper layer of nitride of titanium, zirconium and silicon is applied at the following component ratio, wt %: titanium 83.15-87.35, zirconium 12.0-16.0, silicon 0.65-0.85. Vacuum-plasma coating application is carried out by three cathodes arranged horizontally in one plane. The first cathode consists of titanium and zirconium, the second one consists of niobium and is located opposite to the first one, and the third one consists of alloy of titanium and silicon and is located between them. Bottom layer is applied using the second cathode while top layer is applied using the first and the third cathodes.

EFFECT: higher cutting efficiency.

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