METHOD FOR PREPARATION OF MULTI-LAYER COATING FOR CUTTING TOOLS Russian patent published in 2009 - IPC C23C14/06 C23C14/16 C23C14/34 B23B27/14 

FIELD: chemistry.

SUBSTANCE: method includes applying of the lower layer consisting from nitride or carbonitride of the titanium, silicon and aluminium at their ratio (wt %): - titanium 86.0-87.3, silicon 0.7-1.0, aluminium 12.0-13.0, intermediate layer consisting of nitride or carbonitride of titanium, silicon, chromium and aluminium compound at their ratio (wt %): - titanium 82.9-84.6, silicon 0.5-0.7, chromium 6.9-7.7, aluminium 8.0-8.7, upper layer consisting of nitride or carbonitride of titanium, silicon and chromium compound at their ratio (wt %): - titanium 87.5-88.9, silicon 0.7-1.0, chromium 10.4-11.5. Three cathodes horizontally positioned in one plane are used. The first cathode is made composite from titanium and aluminium, the second cathode is made composite from titanium and chromium and is positioned opposite to the first one and the third cathode is made composite from the titanium and silicon alloy and is positioned between them.

EFFECT: workability enhancing of the cutting tools.

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