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

FIELD: technological processes.

SUBSTANCE: first, bottom layer of titanium nitride is applied. Then, an intermediate layer of the nitride of the titanium and chromium compound is applied at a ratio, wt %: titanium 83.5-86.5, chromium 13.5-16.5. Then, the upper layer of the nitride of the titanium, chromium and niobium compound is applied at a ratio, wt %: titanium 79.0-85.0, chromium 9.0-11.0, niobium 6.0-10.0. The application of the coating layers is carried out horizontally in one plane by three cathodes, the first of which is made of a composite of titanium and chromium, the second of which is made of a composite of titanium and niobium and is placed opposite to the first, and the third is made of titanium and is placed between them, the lower layer is applied using the third cathode, an intermediate layer is applied using the first and the third cathodes, and an upper layer is applied using all three cathodes.

EFFECT: obtaining a coating with high strength properties, which leads to an increased efficiency of the cutting tool.

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