PROCEDURE FOR PRODUCTION OF MULTI-LAYER COATING FOR CUTTING TOOL Russian patent published in 2011 - IPC C23C14/24 C23C14/06 

FIELD: metallurgy.

SUBSTANCE: procedure consists in application of vacuum-plasma three-layer coating. Nitride of titanium and niobium is applied as a lower layer at pressure of nitrogen in the chamber of the installation 7.5·10^-4 Pa and temperature 600°C. The same nitride alloyed with silicon is applied as an intermediate layer at pressure of nitrogen in the chamber of the installation 7.5·10^-4 Pa and temperature 550°C. As an upper layer there is applied nitride of titanium and silicon at pressure of nitrogen in the chamber of the installation 4.3·10^-3 Pa and temperature 500°C. The lower layer is applied with thickness 40-50% of total thickness of coating, while total thickness of coating amounts to 5-8 mcm.

EFFECT: increased functionality of cutting tool (CT) and upgraded quality of treatment.

2 cl, 1 tbl, 1 ex