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

FIELD: metallurgy.

SUBSTANCE: multi-layer coating is apllied by vacuum-plasma method, wherein at first, a lower layer of niobium nitride is applied, and then an upper layer of nitride of titanium, zirconium and molybdenum is applied at the following component ratio, wt %: titanium 78.5-84.0, zirconium 12.0-16.0, molybdenum 4.0-5.5. Layers are apllied with three cathodes located horizontally in one plane, the first one of which consists of titanium and zirconium, and the second one consists of niobium and is located opposite to the first one, and the third one consists of titanium and molybdenum 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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