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

FIELD: metallurgy.

SUBSTANCE: multi-layer coating is applied by vacuum-plasma procedure. A lower layer out of nitride or carbonitride of compound of titanium and chromium is applied at their ratio, wt %: titanium 91.5-93.5, chromium 6.5-8.5. Further, there is applied an intermediate layer out of nitride or carbonitride of compound of titanium, chromium and silicon at their ratio, wt %: titanium 93.15-95.35, chromium 4.0-6.0, silicon 0.65-0.85 and there is applied an upper layer consisting of nitride or carbonitride of compound of titanium, chromium and silicon at their ratio, wt %: titanium 88.15-90.35, chromium 9.0-11.0, silicon 0.65-0.85. Three cathodes arranged horizontally in one plane apply layers of coating. The first and second cathodes are made complex out of titanium and chromium and are arranged opposite to each other, while the third cathode is made out of alloy of titanium and silicon and is set between the first and second cathodes. The lower layer is applied with the first and second cathodes, the intermediate layer is applied with the first and third cathodes, and the upper layer is applied with the second and the third cathodes.

EFFECT: increased operability of cutting tool.

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