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 applied by vacuum plasma method. First, a lower layer of zirconium nitride is applied. Then the top layer of nitride of titanium, aluminium and niobium is applied at the following ratio of components, wt %: titanium 70.0-80.0, aluminium 14.0-20.0, niobium 6.0-10.0. Coating layers are applied by three cathodes located horizontally in the same plane, the first of which is made from titanium and aluminium alloy, the second one - from zirconium and is placed opposite to the first, and the third is made compound from titanium and niobium and placed between them, and the lower layer is applied using the second cathode, and the upper layer - using the first and third cathodes.

EFFECT: higher cutting efficiency.

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