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

FIELD: metallurgy.

SUBSTANCE: ion-plasma coating is applied. First, the lower layer of titanium nitride is applied. Next, an intermediate layer of the nitride compound of titanium and silicon is applied at a ratio, wt %: titanium 98.6-99.0, silicon 1.0-1.4. Then, the upper layer of the nitride compound of titanium, silicon and zirconium is applied at a ratio, wt %: titanium 83.15-87.35, silicon 0.65-0.85, zirconium 12.0-16.0. The coating layers are applied by three cathodes arranged horizontally in one plane. The first cathode is made of the titanium and aluminium alloy, the second cathode is made of titanium and zirconium and arranged opposite the first cathode, while the third cathode is made of the 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.

1 tbl