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

FIELD: metallurgy.

SUBSTANCE: multi-layer coating is applied by vacuum plasma method. First, a lower layer of zirconium nitride is applied. Then, an upper layer of nitride of titanium, chrome and molybdenum is applied at the following component ratio, wt %: titanium 83. 5-87.0, chrome 9.0-11.0, molybdenum 4.0-5.5. Coating plies are applied by three cathodes arranged horizontally in one plane. The first cathode consists of titanium and chrome, the second one consists of zirconium 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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