METHOD FOR PRODUCTION OF MULTILAYER COATING FOR CUTTING TOOL Russian patent published in 2018 - IPC C23C14/06 C23C14/24 B23B27/14 

FIELD: technological processes.

SUBSTANCE: method for production of multilayer coating for cutting tool includes applying ion-plasma multilayer coating consisting of a lower layer of titanium compounds and aluminium nitride during their ratio, wt %: titanium 70.0-79.0, aluminium 21.0-30.0, intermediate layer is of titanium compounds nitride, aluminium and molybdenum in their ratio, wt %: titanium - 75.5-82.5, aluminium p 14.0-20.0, molybdenum - 3.5-4.5 and top layer - titanium nitride. The coating layers are applied horizontally in one plane by three cathodes, the first of which is made of a titanium and silicon alloy, the second one is made of a titanium and molybdenum composite and is placed opposite the first, and the third is made of titanium and is placed between them. The lower layer is applied using the first and third cathodes, the intermediate layer - using all three cathodes, and the upper layer - using the third cathode.

EFFECT: increased cutting tool serviceability.

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