METHOD OF PREPARATION OF MULTI-LAYER COATING FOR CUTTING TOOL Russian patent published in 2008 - IPC C23C14/06 C23C14/16 C23C14/34 B23B27/14 

FIELD: technological processes.

SUBSTANCE: on working surfaces of cutting tool double-layer coating is applied with vacuum-plasma method. As bottom layer nitride of titanium, chrome and iron is applied, which contains 1.2-1.4% of iron, and as top layer nitride of titanium, chrome and iron is applied, which contains 0.4-0.6% of iron. Application of coating is implemented with application of three evaporators, which are installed in horizontal plane, from which two opposite ones contain titanium and chrome, and evaporator installed between them contains titanium and non-magnetic stainless steel. All three cathodes are used in application of top layer, and in application of bottom layer one of cathodes that contains chrome is not used.

EFFECT: increase of cutting tool operability and quality of its processing.

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