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

FIELD: metallurgy.

SUBSTANCE: three-layer coating is applied on working surfaces of cutting tool by vacuum-plasma-procedure. Nitride of titanium and zirconium is applied as a lower layer at pressure of nitrogen in a chamber of the installation 7.5·10^-4 Pa and temperature 600°C. The same nitride alloyed with chromium 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 and nitride of titanium and chromium is applied as an upper layer at pressure of nitrogen in the chamber of the installation 4.3·10^-3 Pa and temperature 500°C.

EFFECT: increased functionality of cutting tool and quality of processing.

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