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

FIELD: metallurgy.

SUBSTANCE: applying multi-layer coating is performed. First, the lower layer of titanium nitride is applied. Then, an intermediate layer of the nitride compound of titanium and aluminium is applied at a ratio, wt %: titanium 70.0-79.0, aluminium 21.0-30.0, and the upper layer of the nitride compound of titanium, aluminium and chromium is applied at a ratio, wt %: titanium 70.5-79.5, aluminium 14.0-20.0, chromium 6.5-9.5. The coating is applied horizontally in one plane with three cathodes. The first cathode is made of titanium and aluminium alloy, the second cathode is made of titanium and chromium and arranged opposite the first cathode, while the third cathode is made of titanium and silicon alloy and arranged between the first and the second cathodes. The lower layer is applied using the third cathode, the intermediate layer - using the first and the third cathodes, and the upper layer - using all three cathodes.

EFFECT: increasing the cutting tool efficiency.

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