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

FIELD: metallurgy.

SUBSTANCE: applied is lower layer of titanium, zirconium and aluminium nitrides at the following ratio of components in wt %: titanium - 71.0-78.3, aluminium - 6.7-10.0, zirconium - 15.0-19.0. Then mid layer of carbonitride of titanium, zirconium and aluminium is applied at the following ratio of components: titanium - 71.0-78.3, aluminium - 6.7-10.0, zirconium - 15.0-19.0. Then top layer of carbonitride of titanium and aluminium is applied at the following ratio of components: titanium - 85.0-90.0, aluminium - 10.0-15.0. Coating layers are applied horizontally in one plane by three cathodes. First and second cathode are made of titanium and aluminium alloys and arranged in opposition while third cathode is made of titanium and zirconium and 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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