METHOD OF MAKING MULTILAYER COATING FOR CUTTING TOOL Russian patent published in 2012 - IPC C23C14/06 C23C14/24 B23B27/14 

FIELD: metallurgy.

SUBSTANCE: vacuum-plasma deposition of multilayer coating is carried out. Lower layer from nitride or carnonitride of titanium, niobium, and molybdenum is deposited at the ratio in wt %: titanium - 86.5-92.0, niobium - 4.0-8.0, molybdenum - 4.0-5.5, while intermediate layer of said components is deposited at the ratio of, in wt %: titanium - 88.0-82.5, niobium - 8.0-12.0, molybdenum - 4.0-5.5, and top layer is deposited at the ratio of, in wt %: titanium - 90.0-94.0, niobium - 6.0-10.0. Coating layers are applied by three cathodes arranged horizontally in one plane. First and second composite cathodes are made from titanium and niobium are arranged opposite each other. Third composite cathode is made from titanium and molybdenum and arranged there between. Bottom layer is applied using first and third cathodes, intermediate layer is produced by second and third cathodes while top layer is made by first and second cathodes.

EFFECT: higher wear resistance.

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