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: as bottom layer nitride of titanium, aluminium and zirconium is applied, which contains 4.5-4.7% of zirconium, and as top layer same nitride is applied, which contains 23.3-23.4% of zirconium. Application of coating is implemented with application of three evaporators, which are installed in horizontal plane, from which two opposite ones contain titanium and aluminium, and evaporator installed between them contains titanium and zirconium. All three evaporators are used in application of bottom layer, and in application of top layer one of cathodes that contains aluminium is not used.

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

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