METHOD OF MAKING MULTI-LAYER COAT FOR CUTTING TOOLS Russian patent published in 2007 - IPC C23C14/24 C23C14/06 

FIELD: application of wear-resistant coats on cutting tools; metalworking.

SUBSTANCE: proposed method includes vacuum-plasma application of multi-layer coat. Lower layer contains nitride or carbonitride of compound of titanium, silicon and iron at the following ratio, mass-%: titanium, 96.8-97.4; silicon, 0.8-1.0; iron, 1.8-2.2. Upper layer contains nitride or carbonitride of compound of titanium, silicon and aluminum at the following ratio, mass-%: titanium, 86.0-87.3; silicon, 0.7-1.0; aluminum, 12.0-13.0. Layers are located horizontally in one plane by means of three cathodes; first sectionalized cathode is made from titanium and iron; second sectionalized cathode is made from titanium and aluminum; second layer is opposite to the first one; third layer is made from titanium and silicon alloy; this layer is located in between them.

EFFECT: increased service life of cutting tools due to enhanced micro-hardness and wear resistance of coat.

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