METHOD OF PRODUCING SANDWICHED COATING FOR CUTTING TOOL Russian patent published in 2013 - IPC C23C14/24 C23C14/06 B23B27/14 

FIELD: metallurgy.

SUBSTANCE: vacuum plasma sandwiched wear-proof coating is applied. First, applied is lower layer of titanium, niobium and silicon nitrides at the following ratio of components in wt %: titanium - 89.0-93.4, silicon - 0.6-1.0, niobium - 6.0-10.0. Then mid layer of carbonitride of titanium, silicon and niobium is applied at the following ratio of components, wt %: titanium - 89.0-93.4, silicon - 0.6-1.0, niobium - 6.0-10.0. Then upper layer of carbonitride of titanium and silicon is applied at the following ratio of components in wt %: titanium - 98.5-99.1, silicon - 0.9-1.5. Coating layers are applied by three cathodes located horizontally in one plane. First and second compound opposed cathodes of titanium and silicon while third compound electrode of titanium and niobium arranged there between. Lower and mid layers are applied by three cathodes while upper layer is applied by first and second cathodes.

EFFECT: higher cutting efficiency.

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