METHOD FOR PRODUCTION OF MULTI-LAYER COATING FOR CUTTING TOOL Russian patent published in 2016 - IPC C23C14/24 B23B27/14 

FIELD: technological processes; metallurgy.

SUBSTANCE: invention relates to methods of application of wear resistant coatings on cutting tool and can be used in machining. Vacuum plasma sandwiched coating is applied. First, a lower layer of titanium nitride is applied. Then upper layer of titanium, zirconium and niobium nitride at their ratio, wt %: titanium 74.0-82.0, zirconium 12.0-16.0, niobium 6.0-10.0. Coating plies are applied by three cathodes arranged horizontally in one plane. First cathode consists of titanium and zirconium, second one consists of titanium and arranged opposite the first one while third compound electrode of titanium and niobium and located between them. Bottom ply is applied with the help of second cathode while top ply is applied by first and third cathodes.

EFFECT: result of application is higher cutting efficiency.

1 cl, 1 tbl