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

FIELD: technological processes.

SUBSTANCE: first, bottom layer of titanium nitride is applied. Then, an intermediate layer of nitride of the titanium and aluminium compound is applied at a ratio, wt %: titanium 70.0-79.0, aluminium 21.0-30.0. Then, the upper layer of the nitride of the titanium, aluminium and niobium compound is applied at a ratio, wt %: titanium 70.0-80.0, aluminium 14.0-20.0, niobium 6.0-10.0. The application of the coating layers is carried out horizontally in one plane by three cathodes, the first of which is made of a titanium and aluminium alloy, the second of which is made of titanium and niobium and is placed opposite to the first, and the third is made of titanium and is placed between them, the lower layer is applied using the third cathode, an intermediate layer is applied using the first and the third cathodes, and an upper layer is applied using all three cathodes.

EFFECT: higher cutting tool efficiency.

1 tbl