METHOD OF PRODUCING SANDWICHED COATING FOR CUTTING TOOL Russian patent published in 2015 - IPC C23C14/06 C23C14/26 B23B27/14 

FIELD: process engineering.

SUBSTANCE: invention relates to application of wearproof coating on cutting tool and can be used in machining. Vacuum plasma sandwiched coating is applied. First, bottom ply of niobium nitride is applied. Then, applied is top ply of titanium, aluminium and chromium nitrides at the following ratio of components in wt %: titanium - 70.5-79.5, aluminium - 14.0-20.0, niobium - 6.5-9.5.Coating plies are applied by three cathodes arranged horizontally in one plane. First cathode are made of titanium and aluminium alloy, second cathode is made of niobium and arranged opposite the first one while third cathode is made of titanium and chromium and arranged there between. Bottom ply is applied with the help of second cathode while top ply is applied by first and third cathodes.

EFFECT: higher cutting efficiency.

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