METHOD OF PRODUCING SANDWICHED COATING FOR CUTTING TOOL Russian patent published in 2015 - IPC C23C14/06 C23C14/24 B23B27/14 

FIELD: process engineering.

SUBSTANCE: invention relates to application of wear-proof coating on cutting tool and can be used in machining. Vacuum plasma sandwiched coating is applied. First, applied is lower layer of titanium, niobium and molybdenum nitrides at the following ratio of components in wt %: titanium - 84.5-90.0, niobium - 6.0-10.0, molybdenum - 4.0-5.5. Then, top ply of titanium nitride is applied. Coating plies are applied by three cathodes arranged horizontally in one plane. First cathode are made of titanium and niobium and arranged in opposition, second cathode is made of molybdenum and arranged opposite the first one while third cathode is made of molybdenum and titanium and arranged there between. Bottom ply is applied with the help of first and third cathode while top ply is applied by second cathode.

EFFECT: higher cutting efficiency.

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